amfenc: Add DXVA2 hardware frame input support
[ffmpeg.git] / libavcodec / mpegvideo.c
index 9db9522..45ea0f0 100644 (file)
@@ -5,20 +5,20 @@
  *
  * 4MV & hq & B-frame encoding stuff by Michael Niedermayer <michaelni@gmx.at>
  *
- * This file is part of Libav.
+ * This file is part of FFmpeg.
  *
- * Libav is free software; you can redistribute it and/or
+ * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
- * Libav is distributed in the hope that it will be useful,
+ * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
- * License along with Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "libavutil/avassert.h"
 #include "libavutil/imgutils.h"
 #include "libavutil/internal.h"
+#include "libavutil/motion_vector.h"
 #include "libavutil/timer.h"
 #include "avcodec.h"
 #include "blockdsp.h"
+#include "h264chroma.h"
 #include "idctdsp.h"
 #include "internal.h"
 #include "mathops.h"
+#include "mpeg_er.h"
 #include "mpegutils.h"
 #include "mpegvideo.h"
+#include "mpegvideodata.h"
 #include "mjpegenc.h"
 #include "msmpeg4.h"
 #include "qpeldsp.h"
-#include "xvmc_internal.h"
 #include "thread.h"
+#include "wmv2.h"
 #include <limits.h>
 
-static const uint8_t ff_default_chroma_qscale_table[32] = {
-//   0   1   2   3   4   5   6   7   8   9  10  11  12  13  14  15
-     0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15,
-    16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31
-};
-
-const uint8_t ff_mpeg1_dc_scale_table[128] = {
-//  0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15
-    8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
-    8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
-    8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
-    8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
-    8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
-    8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
-    8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
-    8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
-};
-
-static const uint8_t mpeg2_dc_scale_table1[128] = {
-//  0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15
-    4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
-    4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
-    4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
-    4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
-    4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
-    4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
-    4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
-    4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
-};
-
-static const uint8_t mpeg2_dc_scale_table2[128] = {
-//  0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15
-    2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
-    2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
-    2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
-    2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
-    2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
-    2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
-    2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
-    2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
-};
-
-static const uint8_t mpeg2_dc_scale_table3[128] = {
-//  0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15
-    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-};
-
-const uint8_t *const ff_mpeg2_dc_scale_table[4] = {
-    ff_mpeg1_dc_scale_table,
-    mpeg2_dc_scale_table1,
-    mpeg2_dc_scale_table2,
-    mpeg2_dc_scale_table3,
-};
-
-const uint8_t ff_alternate_horizontal_scan[64] = {
-     0,  1,  2,  3,  8,  9, 16, 17,
-    10, 11,  4,  5,  6,  7, 15, 14,
-    13, 12, 19, 18, 24, 25, 32, 33,
-    26, 27, 20, 21, 22, 23, 28, 29,
-    30, 31, 34, 35, 40, 41, 48, 49,
-    42, 43, 36, 37, 38, 39, 44, 45,
-    46, 47, 50, 51, 56, 57, 58, 59,
-    52, 53, 54, 55, 60, 61, 62, 63,
-};
-
-const uint8_t ff_alternate_vertical_scan[64] = {
-     0,  8, 16, 24,  1,  9,  2, 10,
-    17, 25, 32, 40, 48, 56, 57, 49,
-    41, 33, 26, 18,  3, 11,  4, 12,
-    19, 27, 34, 42, 50, 58, 35, 43,
-    51, 59, 20, 28,  5, 13,  6, 14,
-    21, 29, 36, 44, 52, 60, 37, 45,
-    53, 61, 22, 30,  7, 15, 23, 31,
-    38, 46, 54, 62, 39, 47, 55, 63,
-};
-
 static void dct_unquantize_mpeg1_intra_c(MpegEncContext *s,
                                    int16_t *block, int n, int qscale)
 {
@@ -137,11 +58,8 @@ static void dct_unquantize_mpeg1_intra_c(MpegEncContext *s,
 
     nCoeffs= s->block_last_index[n];
 
-    if (n < 4)
-        block[0] = block[0] * s->y_dc_scale;
-    else
-        block[0] = block[0] * s->c_dc_scale;
-    /* XXX: only mpeg1 */
+    block[0] *= n < 4 ? s->y_dc_scale : s->c_dc_scale;
+    /* XXX: only MPEG-1 */
     quant_matrix = s->intra_matrix;
     for(i=1;i<=nCoeffs;i++) {
         int j= s->intra_scantable.permutated[i];
@@ -196,13 +114,13 @@ static void dct_unquantize_mpeg2_intra_c(MpegEncContext *s,
     int i, level, nCoeffs;
     const uint16_t *quant_matrix;
 
+    if (s->q_scale_type) qscale = ff_mpeg2_non_linear_qscale[qscale];
+    else                 qscale <<= 1;
+
     if(s->alternate_scan) nCoeffs= 63;
     else nCoeffs= s->block_last_index[n];
 
-    if (n < 4)
-        block[0] = block[0] * s->y_dc_scale;
-    else
-        block[0] = block[0] * s->c_dc_scale;
+    block[0] *= n < 4 ? s->y_dc_scale : s->c_dc_scale;
     quant_matrix = s->intra_matrix;
     for(i=1;i<=nCoeffs;i++) {
         int j= s->intra_scantable.permutated[i];
@@ -210,10 +128,10 @@ static void dct_unquantize_mpeg2_intra_c(MpegEncContext *s,
         if (level) {
             if (level < 0) {
                 level = -level;
-                level = (int)(level * qscale * quant_matrix[j]) >> 3;
+                level = (int)(level * qscale * quant_matrix[j]) >> 4;
                 level = -level;
             } else {
-                level = (int)(level * qscale * quant_matrix[j]) >> 3;
+                level = (int)(level * qscale * quant_matrix[j]) >> 4;
             }
             block[j] = level;
         }
@@ -227,13 +145,14 @@ static void dct_unquantize_mpeg2_intra_bitexact(MpegEncContext *s,
     const uint16_t *quant_matrix;
     int sum=-1;
 
+    if (s->q_scale_type) qscale = ff_mpeg2_non_linear_qscale[qscale];
+    else                 qscale <<= 1;
+
     if(s->alternate_scan) nCoeffs= 63;
     else nCoeffs= s->block_last_index[n];
 
-    if (n < 4)
-        block[0] = block[0] * s->y_dc_scale;
-    else
-        block[0] = block[0] * s->c_dc_scale;
+    block[0] *= n < 4 ? s->y_dc_scale : s->c_dc_scale;
+    sum += block[0];
     quant_matrix = s->intra_matrix;
     for(i=1;i<=nCoeffs;i++) {
         int j= s->intra_scantable.permutated[i];
@@ -241,10 +160,10 @@ static void dct_unquantize_mpeg2_intra_bitexact(MpegEncContext *s,
         if (level) {
             if (level < 0) {
                 level = -level;
-                level = (int)(level * qscale * quant_matrix[j]) >> 3;
+                level = (int)(level * qscale * quant_matrix[j]) >> 4;
                 level = -level;
             } else {
-                level = (int)(level * qscale * quant_matrix[j]) >> 3;
+                level = (int)(level * qscale * quant_matrix[j]) >> 4;
             }
             block[j] = level;
             sum+=level;
@@ -260,6 +179,9 @@ static void dct_unquantize_mpeg2_inter_c(MpegEncContext *s,
     const uint16_t *quant_matrix;
     int sum=-1;
 
+    if (s->q_scale_type) qscale = ff_mpeg2_non_linear_qscale[qscale];
+    else                 qscale <<= 1;
+
     if(s->alternate_scan) nCoeffs= 63;
     else nCoeffs= s->block_last_index[n];
 
@@ -271,11 +193,11 @@ static void dct_unquantize_mpeg2_inter_c(MpegEncContext *s,
             if (level < 0) {
                 level = -level;
                 level = (((level << 1) + 1) * qscale *
-                         ((int) (quant_matrix[j]))) >> 4;
+                         ((int) (quant_matrix[j]))) >> 5;
                 level = -level;
             } else {
                 level = (((level << 1) + 1) * qscale *
-                         ((int) (quant_matrix[j]))) >> 4;
+                         ((int) (quant_matrix[j]))) >> 5;
             }
             block[j] = level;
             sum+=level;
@@ -290,15 +212,12 @@ static void dct_unquantize_h263_intra_c(MpegEncContext *s,
     int i, level, qmul, qadd;
     int nCoeffs;
 
-    assert(s->block_last_index[n]>=0);
+    av_assert2(s->block_last_index[n]>=0 || s->h263_aic);
 
     qmul = qscale << 1;
 
     if (!s->h263_aic) {
-        if (n < 4)
-            block[0] = block[0] * s->y_dc_scale;
-        else
-            block[0] = block[0] * s->c_dc_scale;
+        block[0] *= n < 4 ? s->y_dc_scale : s->c_dc_scale;
         qadd = (qscale - 1) | 1;
     }else{
         qadd = 0;
@@ -306,7 +225,7 @@ static void dct_unquantize_h263_intra_c(MpegEncContext *s,
     if(s->ac_pred)
         nCoeffs=63;
     else
-        nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ];
+        nCoeffs= s->intra_scantable.raster_end[ s->block_last_index[n] ];
 
     for(i=1; i<=nCoeffs; i++) {
         level = block[i];
@@ -327,7 +246,7 @@ static void dct_unquantize_h263_inter_c(MpegEncContext *s,
     int i, level, qmul, qadd;
     int nCoeffs;
 
-    assert(s->block_last_index[n]>=0);
+    av_assert2(s->block_last_index[n]>=0);
 
     qadd = (qscale - 1) | 1;
     qmul = qscale << 1;
@@ -347,61 +266,63 @@ static void dct_unquantize_h263_inter_c(MpegEncContext *s,
     }
 }
 
-static void mpeg_er_decode_mb(void *opaque, int ref, int mv_dir, int mv_type,
-                              int (*mv)[2][4][2],
-                              int mb_x, int mb_y, int mb_intra, int mb_skipped)
-{
-    MpegEncContext *s = opaque;
-
-    s->mv_dir     = mv_dir;
-    s->mv_type    = mv_type;
-    s->mb_intra   = mb_intra;
-    s->mb_skipped = mb_skipped;
-    s->mb_x       = mb_x;
-    s->mb_y       = mb_y;
-    memcpy(s->mv, mv, sizeof(*mv));
-
-    ff_init_block_index(s);
-    ff_update_block_index(s);
-
-    s->bdsp.clear_blocks(s->block[0]);
 
-    s->dest[0] = s->current_picture.f->data[0] + (s->mb_y *  16                       * s->linesize)   + s->mb_x *  16;
-    s->dest[1] = s->current_picture.f->data[1] + (s->mb_y * (16 >> s->chroma_y_shift) * s->uvlinesize) + s->mb_x * (16 >> s->chroma_x_shift);
-    s->dest[2] = s->current_picture.f->data[2] + (s->mb_y * (16 >> s->chroma_y_shift) * s->uvlinesize) + s->mb_x * (16 >> s->chroma_x_shift);
+static void gray16(uint8_t *dst, const uint8_t *src, ptrdiff_t linesize, int h)
+{
+    while(h--)
+        memset(dst + h*linesize, 128, 16);
+}
 
-    if (ref)
-        av_log(s->avctx, AV_LOG_DEBUG,
-               "Interlaced error concealment is not fully implemented\n");
-    ff_mpv_decode_mb(s, s->block);
+static void gray8(uint8_t *dst, const uint8_t *src, ptrdiff_t linesize, int h)
+{
+    while(h--)
+        memset(dst + h*linesize, 128, 8);
 }
 
 /* init common dct for both encoder and decoder */
 static av_cold int dct_init(MpegEncContext *s)
 {
     ff_blockdsp_init(&s->bdsp, s->avctx);
+    ff_h264chroma_init(&s->h264chroma, 8); //for lowres
     ff_hpeldsp_init(&s->hdsp, s->avctx->flags);
     ff_mpegvideodsp_init(&s->mdsp);
     ff_videodsp_init(&s->vdsp, s->avctx->bits_per_raw_sample);
 
+    if (s->avctx->debug & FF_DEBUG_NOMC) {
+        int i;
+        for (i=0; i<4; i++) {
+            s->hdsp.avg_pixels_tab[0][i] = gray16;
+            s->hdsp.put_pixels_tab[0][i] = gray16;
+            s->hdsp.put_no_rnd_pixels_tab[0][i] = gray16;
+
+            s->hdsp.avg_pixels_tab[1][i] = gray8;
+            s->hdsp.put_pixels_tab[1][i] = gray8;
+            s->hdsp.put_no_rnd_pixels_tab[1][i] = gray8;
+        }
+    }
+
     s->dct_unquantize_h263_intra = dct_unquantize_h263_intra_c;
     s->dct_unquantize_h263_inter = dct_unquantize_h263_inter_c;
     s->dct_unquantize_mpeg1_intra = dct_unquantize_mpeg1_intra_c;
     s->dct_unquantize_mpeg1_inter = dct_unquantize_mpeg1_inter_c;
     s->dct_unquantize_mpeg2_intra = dct_unquantize_mpeg2_intra_c;
-    if (s->flags & CODEC_FLAG_BITEXACT)
+    if (s->avctx->flags & AV_CODEC_FLAG_BITEXACT)
         s->dct_unquantize_mpeg2_intra = dct_unquantize_mpeg2_intra_bitexact;
     s->dct_unquantize_mpeg2_inter = dct_unquantize_mpeg2_inter_c;
 
     if (HAVE_INTRINSICS_NEON)
         ff_mpv_common_init_neon(s);
 
+    if (ARCH_ALPHA)
+        ff_mpv_common_init_axp(s);
     if (ARCH_ARM)
         ff_mpv_common_init_arm(s);
     if (ARCH_PPC)
         ff_mpv_common_init_ppc(s);
     if (ARCH_X86)
         ff_mpv_common_init_x86(s);
+    if (ARCH_MIPS)
+        ff_mpv_common_init_mips(s);
 
     return 0;
 }
@@ -424,358 +345,12 @@ av_cold void ff_mpv_idct_init(MpegEncContext *s)
     ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
 }
 
-static int frame_size_alloc(MpegEncContext *s, int linesize)
-{
-    int alloc_size = FFALIGN(FFABS(linesize) + 32, 32);
-
-    // edge emu needs blocksize + filter length - 1
-    // (= 17x17 for  halfpel / 21x21 for  h264)
-    // VC1 computes luma and chroma simultaneously and needs 19X19 + 9x9
-    // at uvlinesize. It supports only YUV420 so 24x24 is enough
-    // linesize * interlaced * MBsize
-    FF_ALLOCZ_OR_GOTO(s->avctx, s->edge_emu_buffer, alloc_size * 2 * 24,
-                      fail);
-
-    FF_ALLOCZ_OR_GOTO(s->avctx, s->me.scratchpad, alloc_size * 2 * 16 * 3,
-                      fail)
-    s->me.temp         = s->me.scratchpad;
-    s->rd_scratchpad   = s->me.scratchpad;
-    s->b_scratchpad    = s->me.scratchpad;
-    s->obmc_scratchpad = s->me.scratchpad + 16;
-
-    return 0;
-fail:
-    av_freep(&s->edge_emu_buffer);
-    return AVERROR(ENOMEM);
-}
-
-/**
- * Allocate a frame buffer
- */
-static int alloc_frame_buffer(MpegEncContext *s, Picture *pic)
-{
-    int edges_needed = av_codec_is_encoder(s->avctx->codec);
-    int r, ret;
-
-    pic->tf.f = pic->f;
-    if (s->codec_id != AV_CODEC_ID_WMV3IMAGE &&
-        s->codec_id != AV_CODEC_ID_VC1IMAGE  &&
-        s->codec_id != AV_CODEC_ID_MSS2) {
-        if (edges_needed) {
-            pic->f->width  = s->avctx->width  + 2 * EDGE_WIDTH;
-            pic->f->height = s->avctx->height + 2 * EDGE_WIDTH;
-        }
-
-        r = ff_thread_get_buffer(s->avctx, &pic->tf,
-                                 pic->reference ? AV_GET_BUFFER_FLAG_REF : 0);
-    } else {
-        pic->f->width  = s->avctx->width;
-        pic->f->height = s->avctx->height;
-        pic->f->format = s->avctx->pix_fmt;
-        r = avcodec_default_get_buffer2(s->avctx, pic->f, 0);
-    }
-
-    if (r < 0 || !pic->f->buf[0]) {
-        av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed (%d %p)\n",
-               r, pic->f->data[0]);
-        return -1;
-    }
-
-    if (edges_needed) {
-        int i;
-        for (i = 0; pic->f->data[i]; i++) {
-            int offset = (EDGE_WIDTH >> (i ? s->chroma_y_shift : 0)) *
-                         pic->f->linesize[i] +
-                         (EDGE_WIDTH >> (i ? s->chroma_x_shift : 0));
-            pic->f->data[i] += offset;
-        }
-        pic->f->width  = s->avctx->width;
-        pic->f->height = s->avctx->height;
-    }
-
-    if (s->avctx->hwaccel) {
-        assert(!pic->hwaccel_picture_private);
-        if (s->avctx->hwaccel->frame_priv_data_size) {
-            pic->hwaccel_priv_buf = av_buffer_allocz(s->avctx->hwaccel->frame_priv_data_size);
-            if (!pic->hwaccel_priv_buf) {
-                av_log(s->avctx, AV_LOG_ERROR, "alloc_frame_buffer() failed (hwaccel private data allocation)\n");
-                return -1;
-            }
-            pic->hwaccel_picture_private = pic->hwaccel_priv_buf->data;
-        }
-    }
-
-    if (s->linesize && (s->linesize   != pic->f->linesize[0] ||
-                        s->uvlinesize != pic->f->linesize[1])) {
-        av_log(s->avctx, AV_LOG_ERROR,
-               "get_buffer() failed (stride changed)\n");
-        ff_mpeg_unref_picture(s, pic);
-        return -1;
-    }
-
-    if (pic->f->linesize[1] != pic->f->linesize[2]) {
-        av_log(s->avctx, AV_LOG_ERROR,
-               "get_buffer() failed (uv stride mismatch)\n");
-        ff_mpeg_unref_picture(s, pic);
-        return -1;
-    }
-
-    if (!s->edge_emu_buffer &&
-        (ret = frame_size_alloc(s, pic->f->linesize[0])) < 0) {
-        av_log(s->avctx, AV_LOG_ERROR,
-               "get_buffer() failed to allocate context scratch buffers.\n");
-        ff_mpeg_unref_picture(s, pic);
-        return ret;
-    }
-
-    return 0;
-}
-
-void ff_free_picture_tables(Picture *pic)
+static int alloc_picture(MpegEncContext *s, Picture *pic, int shared)
 {
-    int i;
-
-    av_buffer_unref(&pic->mb_var_buf);
-    av_buffer_unref(&pic->mc_mb_var_buf);
-    av_buffer_unref(&pic->mb_mean_buf);
-    av_buffer_unref(&pic->mbskip_table_buf);
-    av_buffer_unref(&pic->qscale_table_buf);
-    av_buffer_unref(&pic->mb_type_buf);
-
-    for (i = 0; i < 2; i++) {
-        av_buffer_unref(&pic->motion_val_buf[i]);
-        av_buffer_unref(&pic->ref_index_buf[i]);
-    }
-}
-
-static int alloc_picture_tables(MpegEncContext *s, Picture *pic)
-{
-    const int big_mb_num    = s->mb_stride * (s->mb_height + 1) + 1;
-    const int mb_array_size = s->mb_stride * s->mb_height;
-    const int b8_array_size = s->b8_stride * s->mb_height * 2;
-    int i;
-
-
-    pic->mbskip_table_buf = av_buffer_allocz(mb_array_size + 2);
-    pic->qscale_table_buf = av_buffer_allocz(big_mb_num + s->mb_stride);
-    pic->mb_type_buf      = av_buffer_allocz((big_mb_num + s->mb_stride) *
-                                             sizeof(uint32_t));
-    if (!pic->mbskip_table_buf || !pic->qscale_table_buf || !pic->mb_type_buf)
-        return AVERROR(ENOMEM);
-
-    if (s->encoding) {
-        pic->mb_var_buf    = av_buffer_allocz(mb_array_size * sizeof(int16_t));
-        pic->mc_mb_var_buf = av_buffer_allocz(mb_array_size * sizeof(int16_t));
-        pic->mb_mean_buf   = av_buffer_allocz(mb_array_size);
-        if (!pic->mb_var_buf || !pic->mc_mb_var_buf || !pic->mb_mean_buf)
-            return AVERROR(ENOMEM);
-    }
-
-    if (s->out_format == FMT_H263 || s->encoding) {
-        int mv_size        = 2 * (b8_array_size + 4) * sizeof(int16_t);
-        int ref_index_size = 4 * mb_array_size;
-
-        for (i = 0; mv_size && i < 2; i++) {
-            pic->motion_val_buf[i] = av_buffer_allocz(mv_size);
-            pic->ref_index_buf[i]  = av_buffer_allocz(ref_index_size);
-            if (!pic->motion_val_buf[i] || !pic->ref_index_buf[i])
-                return AVERROR(ENOMEM);
-        }
-    }
-
-    return 0;
-}
-
-static int make_tables_writable(Picture *pic)
-{
-    int ret, i;
-#define MAKE_WRITABLE(table) \
-do {\
-    if (pic->table &&\
-       (ret = av_buffer_make_writable(&pic->table)) < 0)\
-    return ret;\
-} while (0)
-
-    MAKE_WRITABLE(mb_var_buf);
-    MAKE_WRITABLE(mc_mb_var_buf);
-    MAKE_WRITABLE(mb_mean_buf);
-    MAKE_WRITABLE(mbskip_table_buf);
-    MAKE_WRITABLE(qscale_table_buf);
-    MAKE_WRITABLE(mb_type_buf);
-
-    for (i = 0; i < 2; i++) {
-        MAKE_WRITABLE(motion_val_buf[i]);
-        MAKE_WRITABLE(ref_index_buf[i]);
-    }
-
-    return 0;
-}
-
-/**
- * Allocate a Picture.
- * The pixels are allocated/set by calling get_buffer() if shared = 0
- */
-int ff_alloc_picture(MpegEncContext *s, Picture *pic, int shared)
-{
-    int i, ret;
-
-    if (shared) {
-        assert(pic->f->data[0]);
-        pic->shared = 1;
-    } else {
-        assert(!pic->f->buf[0]);
-
-        if (alloc_frame_buffer(s, pic) < 0)
-            return -1;
-
-        s->linesize   = pic->f->linesize[0];
-        s->uvlinesize = pic->f->linesize[1];
-    }
-
-    if (!pic->qscale_table_buf)
-        ret = alloc_picture_tables(s, pic);
-    else
-        ret = make_tables_writable(pic);
-    if (ret < 0)
-        goto fail;
-
-    if (s->encoding) {
-        pic->mb_var    = (uint16_t*)pic->mb_var_buf->data;
-        pic->mc_mb_var = (uint16_t*)pic->mc_mb_var_buf->data;
-        pic->mb_mean   = pic->mb_mean_buf->data;
-    }
-
-    pic->mbskip_table = pic->mbskip_table_buf->data;
-    pic->qscale_table = pic->qscale_table_buf->data + 2 * s->mb_stride + 1;
-    pic->mb_type      = (uint32_t*)pic->mb_type_buf->data + 2 * s->mb_stride + 1;
-
-    if (pic->motion_val_buf[0]) {
-        for (i = 0; i < 2; i++) {
-            pic->motion_val[i] = (int16_t (*)[2])pic->motion_val_buf[i]->data + 4;
-            pic->ref_index[i]  = pic->ref_index_buf[i]->data;
-        }
-    }
-
-    return 0;
-fail:
-    av_log(s->avctx, AV_LOG_ERROR, "Error allocating a picture.\n");
-    ff_mpeg_unref_picture(s, pic);
-    ff_free_picture_tables(pic);
-    return AVERROR(ENOMEM);
-}
-
-/**
- * Deallocate a picture.
- */
-void ff_mpeg_unref_picture(MpegEncContext *s, Picture *pic)
-{
-    int off = offsetof(Picture, mb_mean) + sizeof(pic->mb_mean);
-
-    pic->tf.f = pic->f;
-    /* WM Image / Screen codecs allocate internal buffers with different
-     * dimensions / colorspaces; ignore user-defined callbacks for these. */
-    if (s->codec_id != AV_CODEC_ID_WMV3IMAGE &&
-        s->codec_id != AV_CODEC_ID_VC1IMAGE  &&
-        s->codec_id != AV_CODEC_ID_MSS2)
-        ff_thread_release_buffer(s->avctx, &pic->tf);
-    else if (pic->f)
-        av_frame_unref(pic->f);
-
-    av_buffer_unref(&pic->hwaccel_priv_buf);
-
-    if (pic->needs_realloc)
-        ff_free_picture_tables(pic);
-
-    memset((uint8_t*)pic + off, 0, sizeof(*pic) - off);
-}
-
-static int update_picture_tables(Picture *dst, Picture *src)
-{
-     int i;
-
-#define UPDATE_TABLE(table)\
-do {\
-    if (src->table &&\
-        (!dst->table || dst->table->buffer != src->table->buffer)) {\
-        av_buffer_unref(&dst->table);\
-        dst->table = av_buffer_ref(src->table);\
-        if (!dst->table) {\
-            ff_free_picture_tables(dst);\
-            return AVERROR(ENOMEM);\
-        }\
-    }\
-} while (0)
-
-    UPDATE_TABLE(mb_var_buf);
-    UPDATE_TABLE(mc_mb_var_buf);
-    UPDATE_TABLE(mb_mean_buf);
-    UPDATE_TABLE(mbskip_table_buf);
-    UPDATE_TABLE(qscale_table_buf);
-    UPDATE_TABLE(mb_type_buf);
-    for (i = 0; i < 2; i++) {
-        UPDATE_TABLE(motion_val_buf[i]);
-        UPDATE_TABLE(ref_index_buf[i]);
-    }
-
-    dst->mb_var        = src->mb_var;
-    dst->mc_mb_var     = src->mc_mb_var;
-    dst->mb_mean       = src->mb_mean;
-    dst->mbskip_table  = src->mbskip_table;
-    dst->qscale_table  = src->qscale_table;
-    dst->mb_type       = src->mb_type;
-    for (i = 0; i < 2; i++) {
-        dst->motion_val[i] = src->motion_val[i];
-        dst->ref_index[i]  = src->ref_index[i];
-    }
-
-    return 0;
-}
-
-int ff_mpeg_ref_picture(MpegEncContext *s, Picture *dst, Picture *src)
-{
-    int ret;
-
-    av_assert0(!dst->f->buf[0]);
-    av_assert0(src->f->buf[0]);
-
-    src->tf.f = src->f;
-    dst->tf.f = dst->f;
-    ret = ff_thread_ref_frame(&dst->tf, &src->tf);
-    if (ret < 0)
-        goto fail;
-
-    ret = update_picture_tables(dst, src);
-    if (ret < 0)
-        goto fail;
-
-    if (src->hwaccel_picture_private) {
-        dst->hwaccel_priv_buf = av_buffer_ref(src->hwaccel_priv_buf);
-        if (!dst->hwaccel_priv_buf)
-            goto fail;
-        dst->hwaccel_picture_private = dst->hwaccel_priv_buf->data;
-    }
-
-    dst->field_picture           = src->field_picture;
-    dst->mb_var_sum              = src->mb_var_sum;
-    dst->mc_mb_var_sum           = src->mc_mb_var_sum;
-    dst->b_frame_score           = src->b_frame_score;
-    dst->needs_realloc           = src->needs_realloc;
-    dst->reference               = src->reference;
-    dst->shared                  = src->shared;
-
-    return 0;
-fail:
-    ff_mpeg_unref_picture(s, dst);
-    return ret;
-}
-
-static void exchange_uv(MpegEncContext *s)
-{
-    int16_t (*tmp)[64];
-
-    tmp           = s->pblocks[4];
-    s->pblocks[4] = s->pblocks[5];
-    s->pblocks[5] = tmp;
+    return ff_alloc_picture(s->avctx, pic, &s->me, &s->sc, shared, 0,
+                            s->chroma_x_shift, s->chroma_y_shift, s->out_format,
+                            s->mb_stride, s->mb_width, s->mb_height, s->b8_stride,
+                            &s->linesize, &s->uvlinesize);
 }
 
 static int init_duplicate_context(MpegEncContext *s)
@@ -785,19 +360,22 @@ static int init_duplicate_context(MpegEncContext *s)
     int yc_size = y_size + 2 * c_size;
     int i;
 
-    s->edge_emu_buffer =
+    if (s->mb_height & 1)
+        yc_size += 2*s->b8_stride + 2*s->mb_stride;
+
+    s->sc.edge_emu_buffer =
     s->me.scratchpad   =
     s->me.temp         =
-    s->rd_scratchpad   =
-    s->b_scratchpad    =
-    s->obmc_scratchpad = NULL;
+    s->sc.rd_scratchpad   =
+    s->sc.b_scratchpad    =
+    s->sc.obmc_scratchpad = NULL;
 
     if (s->encoding) {
         FF_ALLOCZ_OR_GOTO(s->avctx, s->me.map,
                           ME_MAP_SIZE * sizeof(uint32_t), fail)
         FF_ALLOCZ_OR_GOTO(s->avctx, s->me.score_map,
                           ME_MAP_SIZE * sizeof(uint32_t), fail)
-        if (s->avctx->noise_reduction) {
+        if (s->noise_reduction) {
             FF_ALLOCZ_OR_GOTO(s->avctx, s->dct_error_sum,
                               2 * 64 * sizeof(int), fail)
         }
@@ -808,8 +386,13 @@ static int init_duplicate_context(MpegEncContext *s)
     for (i = 0; i < 12; i++) {
         s->pblocks[i] = &s->block[i];
     }
-    if (s->avctx->codec_tag == AV_RL32("VCR2"))
-        exchange_uv(s);
+
+    FF_ALLOCZ_OR_GOTO(s->avctx, s->block32, sizeof(*s->block32), fail)
+
+    if (s->avctx->codec_tag == AV_RL32("VCR2")) {
+        // exchange uv
+        FFSWAP(void *, s->pblocks[4], s->pblocks[5]);
+    }
 
     if (s->out_format == FMT_H263) {
         /* ac values */
@@ -830,17 +413,18 @@ static void free_duplicate_context(MpegEncContext *s)
     if (!s)
         return;
 
-    av_freep(&s->edge_emu_buffer);
+    av_freep(&s->sc.edge_emu_buffer);
     av_freep(&s->me.scratchpad);
     s->me.temp =
-    s->rd_scratchpad =
-    s->b_scratchpad =
-    s->obmc_scratchpad = NULL;
+    s->sc.rd_scratchpad =
+    s->sc.b_scratchpad =
+    s->sc.obmc_scratchpad = NULL;
 
     av_freep(&s->dct_error_sum);
     av_freep(&s->me.map);
     av_freep(&s->me.score_map);
     av_freep(&s->blocks);
+    av_freep(&s->block32);
     av_freep(&s->ac_val_base);
     s->block = NULL;
 }
@@ -848,16 +432,17 @@ static void free_duplicate_context(MpegEncContext *s)
 static void backup_duplicate_context(MpegEncContext *bak, MpegEncContext *src)
 {
 #define COPY(a) bak->a = src->a
-    COPY(edge_emu_buffer);
+    COPY(sc.edge_emu_buffer);
     COPY(me.scratchpad);
     COPY(me.temp);
-    COPY(rd_scratchpad);
-    COPY(b_scratchpad);
-    COPY(obmc_scratchpad);
+    COPY(sc.rd_scratchpad);
+    COPY(sc.b_scratchpad);
+    COPY(sc.obmc_scratchpad);
     COPY(me.map);
     COPY(me.score_map);
     COPY(blocks);
     COPY(block);
+    COPY(block32);
     COPY(start_mb_y);
     COPY(end_mb_y);
     COPY(me.map_generation);
@@ -884,10 +469,13 @@ int ff_update_duplicate_context(MpegEncContext *dst, MpegEncContext *src)
     for (i = 0; i < 12; i++) {
         dst->pblocks[i] = &dst->block[i];
     }
-    if (dst->avctx->codec_tag == AV_RL32("VCR2"))
-        exchange_uv(dst);
-    if (!dst->edge_emu_buffer &&
-        (ret = frame_size_alloc(dst, dst->linesize)) < 0) {
+    if (dst->avctx->codec_tag == AV_RL32("VCR2")) {
+        // exchange uv
+        FFSWAP(void *, dst->pblocks[4], dst->pblocks[5]);
+    }
+    if (!dst->sc.edge_emu_buffer &&
+        (ret = ff_mpeg_framesize_alloc(dst->avctx, &dst->me,
+                                       &dst->sc, dst->linesize)) < 0) {
         av_log(dst->avctx, AV_LOG_ERROR, "failed to allocate context "
                "scratch buffers.\n");
         return ret;
@@ -903,9 +491,11 @@ int ff_mpeg_update_thread_context(AVCodecContext *dst,
     int i, ret;
     MpegEncContext *s = dst->priv_data, *s1 = src->priv_data;
 
-    if (dst == src || !s1->context_initialized)
+    if (dst == src)
         return 0;
 
+    av_assert0(s != s1);
+
     // FIXME can parameters change on I-frames?
     // in that case dst may need a reinit
     if (!s->context_initialized) {
@@ -916,18 +506,24 @@ int ff_mpeg_update_thread_context(AVCodecContext *dst,
         s->bitstream_buffer      = NULL;
         s->bitstream_buffer_size = s->allocated_bitstream_buffer_size = 0;
 
-        ff_mpv_idct_init(s);
-        if ((err = ff_mpv_common_init(s)) < 0)
-            return err;
+        if (s1->context_initialized){
+//             s->picture_range_start  += MAX_PICTURE_COUNT;
+//             s->picture_range_end    += MAX_PICTURE_COUNT;
+            ff_mpv_idct_init(s);
+            if((err = ff_mpv_common_init(s)) < 0){
+                memset(s, 0, sizeof(MpegEncContext));
+                s->avctx = dst;
+                return err;
+            }
+        }
     }
 
     if (s->height != s1->height || s->width != s1->width || s->context_reinit) {
-        int err;
         s->context_reinit = 0;
         s->height = s1->height;
         s->width  = s1->width;
-        if ((err = ff_mpv_common_frame_size_change(s)) < 0)
-            return err;
+        if ((ret = ff_mpv_common_frame_size_change(s)) < 0)
+            return ret;
     }
 
     s->avctx->coded_height  = s1->avctx->coded_height;
@@ -938,20 +534,22 @@ int ff_mpeg_update_thread_context(AVCodecContext *dst,
     s->coded_picture_number = s1->coded_picture_number;
     s->picture_number       = s1->picture_number;
 
+    av_assert0(!s->picture || s->picture != s1->picture);
+    if(s->picture)
     for (i = 0; i < MAX_PICTURE_COUNT; i++) {
-        ff_mpeg_unref_picture(s, &s->picture[i]);
-        if (s1->picture[i].f->buf[0] &&
-            (ret = ff_mpeg_ref_picture(s, &s->picture[i], &s1->picture[i])) < 0)
+        ff_mpeg_unref_picture(s->avctx, &s->picture[i]);
+        if (s1->picture && s1->picture[i].f->buf[0] &&
+            (ret = ff_mpeg_ref_picture(s->avctx, &s->picture[i], &s1->picture[i])) < 0)
             return ret;
     }
 
 #define UPDATE_PICTURE(pic)\
 do {\
-    ff_mpeg_unref_picture(s, &s->pic);\
-    if (s1->pic.f->buf[0])\
-        ret = ff_mpeg_ref_picture(s, &s->pic, &s1->pic);\
+    ff_mpeg_unref_picture(s->avctx, &s->pic);\
+    if (s1->pic.f && s1->pic.f->buf[0])\
+        ret = ff_mpeg_ref_picture(s->avctx, &s->pic, &s1->pic);\
     else\
-        ret = update_picture_tables(&s->pic, &s1->pic);\
+        ret = ff_update_picture_tables(&s->pic, &s1->pic);\
     if (ret < 0)\
         return ret;\
 } while (0)
@@ -972,8 +570,9 @@ do {\
     // Error/bug resilience
     s->next_p_frame_damaged = s1->next_p_frame_damaged;
     s->workaround_bugs      = s1->workaround_bugs;
+    s->padding_bug_score    = s1->padding_bug_score;
 
-    // MPEG4 timing info
+    // MPEG-4 timing info
     memcpy(&s->last_time_base, &s1->last_time_base,
            (char *) &s1->pb_field_time + sizeof(s1->pb_field_time) -
            (char *) &s1->last_time_base);
@@ -988,21 +587,27 @@ do {\
 
     if (s1->bitstream_buffer) {
         if (s1->bitstream_buffer_size +
-            FF_INPUT_BUFFER_PADDING_SIZE > s->allocated_bitstream_buffer_size)
+            AV_INPUT_BUFFER_PADDING_SIZE > s->allocated_bitstream_buffer_size) {
             av_fast_malloc(&s->bitstream_buffer,
                            &s->allocated_bitstream_buffer_size,
                            s1->allocated_bitstream_buffer_size);
-            s->bitstream_buffer_size = s1->bitstream_buffer_size;
+            if (!s->bitstream_buffer) {
+                s->bitstream_buffer_size = 0;
+                return AVERROR(ENOMEM);
+            }
+        }
+        s->bitstream_buffer_size = s1->bitstream_buffer_size;
         memcpy(s->bitstream_buffer, s1->bitstream_buffer,
                s1->bitstream_buffer_size);
         memset(s->bitstream_buffer + s->bitstream_buffer_size, 0,
-               FF_INPUT_BUFFER_PADDING_SIZE);
+               AV_INPUT_BUFFER_PADDING_SIZE);
     }
 
-    // linesize dependend scratch buffer allocation
-    if (!s->edge_emu_buffer)
+    // linesize-dependent scratch buffer allocation
+    if (!s->sc.edge_emu_buffer)
         if (s1->linesize) {
-            if (frame_size_alloc(s, s1->linesize) < 0) {
+            if (ff_mpeg_framesize_alloc(s->avctx, &s->me,
+                                        &s->sc, s1->linesize) < 0) {
                 av_log(s->avctx, AV_LOG_ERROR, "Failed to allocate context "
                        "scratch buffers.\n");
                 return AVERROR(ENOMEM);
@@ -1010,10 +615,9 @@ do {\
         } else {
             av_log(s->avctx, AV_LOG_ERROR, "Context scratch buffers could not "
                    "be allocated due to unknown size.\n");
-            return AVERROR_BUG;
         }
 
-    // MPEG2/interlacing info
+    // MPEG-2/interlacing info
     memcpy(&s->progressive_sequence, &s1->progressive_sequence,
            (char *) &s1->rtp_mode - (char *) &s1->progressive_sequence);
 
@@ -1060,40 +664,16 @@ void ff_mpv_decode_defaults(MpegEncContext *s)
     ff_mpv_common_defaults(s);
 }
 
-static int init_er(MpegEncContext *s)
+void ff_mpv_decode_init(MpegEncContext *s, AVCodecContext *avctx)
 {
-    ERContext *er = &s->er;
-    int mb_array_size = s->mb_height * s->mb_stride;
-    int i;
-
-    er->avctx       = s->avctx;
-
-    er->mb_index2xy = s->mb_index2xy;
-    er->mb_num      = s->mb_num;
-    er->mb_width    = s->mb_width;
-    er->mb_height   = s->mb_height;
-    er->mb_stride   = s->mb_stride;
-    er->b8_stride   = s->b8_stride;
-
-    er->er_temp_buffer     = av_malloc(s->mb_height * s->mb_stride);
-    er->error_status_table = av_mallocz(mb_array_size);
-    if (!er->er_temp_buffer || !er->error_status_table)
-        goto fail;
-
-    er->mbskip_table  = s->mbskip_table;
-    er->mbintra_table = s->mbintra_table;
-
-    for (i = 0; i < FF_ARRAY_ELEMS(s->dc_val); i++)
-        er->dc_val[i] = s->dc_val[i];
-
-    er->decode_mb = mpeg_er_decode_mb;
-    er->opaque    = s;
+    s->avctx           = avctx;
+    s->width           = avctx->coded_width;
+    s->height          = avctx->coded_height;
+    s->codec_id        = avctx->codec->id;
+    s->workaround_bugs = avctx->workaround_bugs;
 
-    return 0;
-fail:
-    av_freep(&er->er_temp_buffer);
-    av_freep(&er->error_status_table);
-    return AVERROR(ENOMEM);
+    /* convert fourcc to upper case */
+    s->codec_tag          = avpriv_toupper4(avctx->codec_tag);
 }
 
 /**
@@ -1109,7 +689,7 @@ static int init_context_frame(MpegEncContext *s)
     mb_array_size = s->mb_height * s->mb_stride;
     mv_table_size = (s->mb_height + 2) * s->mb_stride + 1;
 
-    /* set default edge pos, will be overriden
+    /* set default edge pos, will be overridden
      * in decode_header if needed */
     s->h_edge_pos = s->mb_width * 16;
     s->v_edge_pos = s->mb_height * 16;
@@ -1127,44 +707,36 @@ static int init_context_frame(MpegEncContext *s)
     c_size  = s->mb_stride * (s->mb_height + 1);
     yc_size = y_size + 2   * c_size;
 
+    if (s->mb_height & 1)
+        yc_size += 2*s->b8_stride + 2*s->mb_stride;
+
     FF_ALLOCZ_OR_GOTO(s->avctx, s->mb_index2xy, (s->mb_num + 1) * sizeof(int),
-                      fail); // error ressilience code looks cleaner with this
+                      fail); // error resilience code looks cleaner with this
     for (y = 0; y < s->mb_height; y++)
         for (x = 0; x < s->mb_width; x++)
             s->mb_index2xy[x + y * s->mb_width] = x + y * s->mb_stride;
 
-    s->mb_index2xy[s->mb_height * s->mb_width] =
-        (s->mb_height - 1) * s->mb_stride + s->mb_width; // FIXME really needed?
+    s->mb_index2xy[s->mb_height * s->mb_width] = (s->mb_height - 1) * s->mb_stride + s->mb_width; // FIXME really needed?
 
     if (s->encoding) {
         /* Allocate MV tables */
-        FF_ALLOCZ_OR_GOTO(s->avctx, s->p_mv_table_base,
-                          mv_table_size * 2 * sizeof(int16_t), fail);
-        FF_ALLOCZ_OR_GOTO(s->avctx, s->b_forw_mv_table_base,
-                          mv_table_size * 2 * sizeof(int16_t), fail);
-        FF_ALLOCZ_OR_GOTO(s->avctx, s->b_back_mv_table_base,
-                          mv_table_size * 2 * sizeof(int16_t), fail);
-        FF_ALLOCZ_OR_GOTO(s->avctx, s->b_bidir_forw_mv_table_base,
-                          mv_table_size * 2 * sizeof(int16_t), fail);
-        FF_ALLOCZ_OR_GOTO(s->avctx, s->b_bidir_back_mv_table_base,
-                          mv_table_size * 2 * sizeof(int16_t), fail);
-        FF_ALLOCZ_OR_GOTO(s->avctx, s->b_direct_mv_table_base,
-                          mv_table_size * 2 * sizeof(int16_t), fail);
+        FF_ALLOCZ_OR_GOTO(s->avctx, s->p_mv_table_base,                 mv_table_size * 2 * sizeof(int16_t), fail)
+        FF_ALLOCZ_OR_GOTO(s->avctx, s->b_forw_mv_table_base,            mv_table_size * 2 * sizeof(int16_t), fail)
+        FF_ALLOCZ_OR_GOTO(s->avctx, s->b_back_mv_table_base,            mv_table_size * 2 * sizeof(int16_t), fail)
+        FF_ALLOCZ_OR_GOTO(s->avctx, s->b_bidir_forw_mv_table_base,      mv_table_size * 2 * sizeof(int16_t), fail)
+        FF_ALLOCZ_OR_GOTO(s->avctx, s->b_bidir_back_mv_table_base,      mv_table_size * 2 * sizeof(int16_t), fail)
+        FF_ALLOCZ_OR_GOTO(s->avctx, s->b_direct_mv_table_base,          mv_table_size * 2 * sizeof(int16_t), fail)
         s->p_mv_table            = s->p_mv_table_base + s->mb_stride + 1;
         s->b_forw_mv_table       = s->b_forw_mv_table_base + s->mb_stride + 1;
         s->b_back_mv_table       = s->b_back_mv_table_base + s->mb_stride + 1;
-        s->b_bidir_forw_mv_table = s->b_bidir_forw_mv_table_base +
-                                   s->mb_stride + 1;
-        s->b_bidir_back_mv_table = s->b_bidir_back_mv_table_base +
-                                   s->mb_stride + 1;
+        s->b_bidir_forw_mv_table = s->b_bidir_forw_mv_table_base + s->mb_stride + 1;
+        s->b_bidir_back_mv_table = s->b_bidir_back_mv_table_base + s->mb_stride + 1;
         s->b_direct_mv_table     = s->b_direct_mv_table_base + s->mb_stride + 1;
 
         /* Allocate MB type table */
-        FF_ALLOCZ_OR_GOTO(s->avctx, s->mb_type, mb_array_size *
-                          sizeof(uint16_t), fail); // needed for encoding
+        FF_ALLOCZ_OR_GOTO(s->avctx, s->mb_type, mb_array_size * sizeof(uint16_t), fail) // needed for encoding
 
-        FF_ALLOCZ_OR_GOTO(s->avctx, s->lambda_table, mb_array_size *
-                          sizeof(int), fail);
+        FF_ALLOCZ_OR_GOTO(s->avctx, s->lambda_table, mb_array_size * sizeof(int), fail)
 
         FF_ALLOC_OR_GOTO(s->avctx, s->cplx_tab,
                          mb_array_size * sizeof(float), fail);
@@ -1174,7 +746,7 @@ static int init_context_frame(MpegEncContext *s)
     }
 
     if (s->codec_id == AV_CODEC_ID_MPEG4 ||
-        (s->flags & CODEC_FLAG_INTERLACED_ME)) {
+        (s->avctx->flags & AV_CODEC_FLAG_INTERLACED_ME)) {
         /* interlaced direct mode decoding tables */
         for (i = 0; i < 2; i++) {
             int j, k;
@@ -1187,34 +759,27 @@ static int init_context_frame(MpegEncContext *s)
                     s->b_field_mv_table[i][j][k] = s->b_field_mv_table_base[i][j][k] +
                                                    s->mb_stride + 1;
                 }
-                FF_ALLOCZ_OR_GOTO(s->avctx, s->b_field_select_table [i][j],
-                                  mb_array_size * 2 * sizeof(uint8_t), fail);
-                FF_ALLOCZ_OR_GOTO(s->avctx, s->p_field_mv_table_base[i][j],
-                                  mv_table_size * 2 * sizeof(int16_t), fail);
-                s->p_field_mv_table[i][j] = s->p_field_mv_table_base[i][j]
-                                            + s->mb_stride + 1;
+                FF_ALLOCZ_OR_GOTO(s->avctx, s->b_field_select_table [i][j], mb_array_size * 2 * sizeof(uint8_t), fail)
+                FF_ALLOCZ_OR_GOTO(s->avctx, s->p_field_mv_table_base[i][j], mv_table_size * 2 * sizeof(int16_t), fail)
+                s->p_field_mv_table[i][j] = s->p_field_mv_table_base[i][j] + s->mb_stride + 1;
             }
-            FF_ALLOCZ_OR_GOTO(s->avctx, s->p_field_select_table[i],
-                              mb_array_size * 2 * sizeof(uint8_t), fail);
+            FF_ALLOCZ_OR_GOTO(s->avctx, s->p_field_select_table[i], mb_array_size * 2 * sizeof(uint8_t), fail)
         }
     }
     if (s->out_format == FMT_H263) {
         /* cbp values */
-        FF_ALLOCZ_OR_GOTO(s->avctx, s->coded_block_base, y_size, fail);
+        FF_ALLOCZ_OR_GOTO(s->avctx, s->coded_block_base, y_size + (s->mb_height&1)*2*s->b8_stride, fail);
         s->coded_block = s->coded_block_base + s->b8_stride + 1;
 
         /* cbp, ac_pred, pred_dir */
-        FF_ALLOCZ_OR_GOTO(s->avctx, s->cbp_table,
-                          mb_array_size * sizeof(uint8_t), fail);
-        FF_ALLOCZ_OR_GOTO(s->avctx, s->pred_dir_table,
-                          mb_array_size * sizeof(uint8_t), fail);
+        FF_ALLOCZ_OR_GOTO(s->avctx, s->cbp_table     , mb_array_size * sizeof(uint8_t), fail);
+        FF_ALLOCZ_OR_GOTO(s->avctx, s->pred_dir_table, mb_array_size * sizeof(uint8_t), fail);
     }
 
     if (s->h263_pred || s->h263_plus || !s->encoding) {
         /* dc values */
-        // MN: we need these for  error resilience of intra-frames
-        FF_ALLOCZ_OR_GOTO(s->avctx, s->dc_val_base,
-                          yc_size * sizeof(int16_t), fail);
+        // MN: we need these for error resilience of intra-frames
+        FF_ALLOCZ_OR_GOTO(s->avctx, s->dc_val_base, yc_size * sizeof(int16_t), fail);
         s->dc_val[0] = s->dc_val_base + s->b8_stride + 1;
         s->dc_val[1] = s->dc_val_base + y_size + s->mb_stride + 1;
         s->dc_val[2] = s->dc_val[1] + c_size;
@@ -1222,30 +787,108 @@ static int init_context_frame(MpegEncContext *s)
             s->dc_val_base[i] = 1024;
     }
 
-    /* which mb is a intra block */
+    /* which mb is an intra block */
     FF_ALLOCZ_OR_GOTO(s->avctx, s->mbintra_table, mb_array_size, fail);
     memset(s->mbintra_table, 1, mb_array_size);
 
     /* init macroblock skip table */
     FF_ALLOCZ_OR_GOTO(s->avctx, s->mbskip_table, mb_array_size + 2, fail);
-    // Note the + 1 is for  a quicker mpeg4 slice_end detection
+    // Note the + 1 is for a quicker MPEG-4 slice_end detection
 
-    return init_er(s);
+    return ff_mpeg_er_init(s);
 fail:
     return AVERROR(ENOMEM);
 }
 
+static void clear_context(MpegEncContext *s)
+{
+    int i, j, k;
+
+    memset(&s->next_picture, 0, sizeof(s->next_picture));
+    memset(&s->last_picture, 0, sizeof(s->last_picture));
+    memset(&s->current_picture, 0, sizeof(s->current_picture));
+    memset(&s->new_picture, 0, sizeof(s->new_picture));
+
+    memset(s->thread_context, 0, sizeof(s->thread_context));
+
+    s->me.map = NULL;
+    s->me.score_map = NULL;
+    s->dct_error_sum = NULL;
+    s->block = NULL;
+    s->blocks = NULL;
+    s->block32 = NULL;
+    memset(s->pblocks, 0, sizeof(s->pblocks));
+    s->ac_val_base = NULL;
+    s->ac_val[0] =
+    s->ac_val[1] =
+    s->ac_val[2] =NULL;
+    s->sc.edge_emu_buffer = NULL;
+    s->me.scratchpad = NULL;
+    s->me.temp =
+    s->sc.rd_scratchpad =
+    s->sc.b_scratchpad =
+    s->sc.obmc_scratchpad = NULL;
+
+
+    s->bitstream_buffer = NULL;
+    s->allocated_bitstream_buffer_size = 0;
+    s->picture          = NULL;
+    s->mb_type          = NULL;
+    s->p_mv_table_base  = NULL;
+    s->b_forw_mv_table_base = NULL;
+    s->b_back_mv_table_base = NULL;
+    s->b_bidir_forw_mv_table_base = NULL;
+    s->b_bidir_back_mv_table_base = NULL;
+    s->b_direct_mv_table_base = NULL;
+    s->p_mv_table            = NULL;
+    s->b_forw_mv_table       = NULL;
+    s->b_back_mv_table       = NULL;
+    s->b_bidir_forw_mv_table = NULL;
+    s->b_bidir_back_mv_table = NULL;
+    s->b_direct_mv_table     = NULL;
+    for (i = 0; i < 2; i++) {
+        for (j = 0; j < 2; j++) {
+            for (k = 0; k < 2; k++) {
+                s->b_field_mv_table_base[i][j][k] = NULL;
+                s->b_field_mv_table[i][j][k] = NULL;
+            }
+            s->b_field_select_table[i][j] = NULL;
+            s->p_field_mv_table_base[i][j] = NULL;
+            s->p_field_mv_table[i][j] = NULL;
+        }
+        s->p_field_select_table[i] = NULL;
+    }
+
+    s->dc_val_base = NULL;
+    s->coded_block_base = NULL;
+    s->mbintra_table = NULL;
+    s->cbp_table = NULL;
+    s->pred_dir_table = NULL;
+
+    s->mbskip_table = NULL;
+
+    s->er.error_status_table = NULL;
+    s->er.er_temp_buffer = NULL;
+    s->mb_index2xy = NULL;
+    s->lambda_table = NULL;
+
+    s->cplx_tab = NULL;
+    s->bits_tab = NULL;
+}
+
 /**
  * init common structure for both encoder and decoder.
  * this assumes that some variables like width/height are already set
  */
 av_cold int ff_mpv_common_init(MpegEncContext *s)
 {
-    int i;
+    int i, ret;
     int nb_slices = (HAVE_THREADS &&
                      s->avctx->active_thread_type & FF_THREAD_SLICE) ?
                     s->avctx->thread_count : 1;
 
+    clear_context(s);
+
     if (s->encoding && s->avctx->slices)
         nb_slices = s->avctx->slices;
 
@@ -1277,16 +920,12 @@ av_cold int ff_mpv_common_init(MpegEncContext *s)
 
     dct_init(s);
 
-    s->flags  = s->avctx->flags;
-    s->flags2 = s->avctx->flags2;
-
     /* set chroma shifts */
-    av_pix_fmt_get_chroma_sub_sample(s->avctx->pix_fmt,
-                                     &s->chroma_x_shift,
-                                     &s->chroma_y_shift);
-
-    /* convert fourcc to upper case */
-    s->codec_tag          = avpriv_toupper4(s->avctx->codec_tag);
+    ret = av_pix_fmt_get_chroma_sub_sample(s->avctx->pix_fmt,
+                                           &s->chroma_x_shift,
+                                           &s->chroma_y_shift);
+    if (ret)
+        return ret;
 
     FF_ALLOCZ_OR_GOTO(s->avctx, s->picture,
                       MAX_PICTURE_COUNT * sizeof(Picture), fail);
@@ -1295,10 +934,6 @@ av_cold int ff_mpv_common_init(MpegEncContext *s)
         if (!s->picture[i].f)
             goto fail;
     }
-    memset(&s->next_picture, 0, sizeof(s->next_picture));
-    memset(&s->last_picture, 0, sizeof(s->last_picture));
-    memset(&s->current_picture, 0, sizeof(s->current_picture));
-    memset(&s->new_picture, 0, sizeof(s->new_picture));
     s->next_picture.f = av_frame_alloc();
     if (!s->next_picture.f)
         goto fail;
@@ -1312,39 +947,38 @@ av_cold int ff_mpv_common_init(MpegEncContext *s)
     if (!s->new_picture.f)
         goto fail;
 
-    if (s->width && s->height) {
-        if (init_context_frame(s))
-            goto fail;
+    if (init_context_frame(s))
+        goto fail;
 
-        s->parse_context.state = -1;
-    }
+    s->parse_context.state = -1;
 
     s->context_initialized = 1;
+    memset(s->thread_context, 0, sizeof(s->thread_context));
     s->thread_context[0]   = s;
 
-    if (s->width && s->height) {
-        if (nb_slices > 1) {
-            for (i = 1; i < nb_slices; i++) {
-                s->thread_context[i] = av_malloc(sizeof(MpegEncContext));
-                memcpy(s->thread_context[i], s, sizeof(MpegEncContext));
-            }
-
-            for (i = 0; i < nb_slices; i++) {
-                if (init_duplicate_context(s->thread_context[i]) < 0)
+//     if (s->width && s->height) {
+    if (nb_slices > 1) {
+        for (i = 0; i < nb_slices; i++) {
+            if (i) {
+                s->thread_context[i] = av_memdup(s, sizeof(MpegEncContext));
+                if (!s->thread_context[i])
                     goto fail;
-                    s->thread_context[i]->start_mb_y =
-                        (s->mb_height * (i) + nb_slices / 2) / nb_slices;
-                    s->thread_context[i]->end_mb_y   =
-                        (s->mb_height * (i + 1) + nb_slices / 2) / nb_slices;
             }
-        } else {
-            if (init_duplicate_context(s) < 0)
+            if (init_duplicate_context(s->thread_context[i]) < 0)
                 goto fail;
-            s->start_mb_y = 0;
-            s->end_mb_y   = s->mb_height;
+            s->thread_context[i]->start_mb_y =
+                (s->mb_height * (i) + nb_slices / 2) / nb_slices;
+            s->thread_context[i]->end_mb_y   =
+                (s->mb_height * (i + 1) + nb_slices / 2) / nb_slices;
         }
-        s->slice_context_count = nb_slices;
+    } else {
+        if (init_duplicate_context(s) < 0)
+            goto fail;
+        s->start_mb_y = 0;
+        s->end_mb_y   = s->mb_height;
     }
+    s->slice_context_count = nb_slices;
+//     }
 
     return 0;
  fail:
@@ -1399,6 +1033,7 @@ static void free_context_frame(MpegEncContext *s)
     av_freep(&s->er.er_temp_buffer);
     av_freep(&s->mb_index2xy);
     av_freep(&s->lambda_table);
+
     av_freep(&s->cplx_tab);
     av_freep(&s->bits_tab);
 
@@ -1409,6 +1044,9 @@ int ff_mpv_common_frame_size_change(MpegEncContext *s)
 {
     int i, err = 0;
 
+    if (!s->context_initialized)
+        return AVERROR(EINVAL);
+
     if (s->slice_context_count > 1) {
         for (i = 0; i < s->slice_context_count; i++) {
             free_duplicate_context(s->thread_context[i]);
@@ -1443,26 +1081,30 @@ int ff_mpv_common_frame_size_change(MpegEncContext *s)
     if ((err = init_context_frame(s)))
         goto fail;
 
+    memset(s->thread_context, 0, sizeof(s->thread_context));
     s->thread_context[0]   = s;
 
     if (s->width && s->height) {
         int nb_slices = s->slice_context_count;
         if (nb_slices > 1) {
-            for (i = 1; i < nb_slices; i++) {
-                s->thread_context[i] = av_malloc(sizeof(MpegEncContext));
-                memcpy(s->thread_context[i], s, sizeof(MpegEncContext));
-            }
-
             for (i = 0; i < nb_slices; i++) {
+                if (i) {
+                    s->thread_context[i] = av_memdup(s, sizeof(MpegEncContext));
+                    if (!s->thread_context[i]) {
+                        err = AVERROR(ENOMEM);
+                        goto fail;
+                    }
+                }
                 if ((err = init_duplicate_context(s->thread_context[i])) < 0)
                     goto fail;
-                    s->thread_context[i]->start_mb_y =
-                        (s->mb_height * (i) + nb_slices / 2) / nb_slices;
-                    s->thread_context[i]->end_mb_y   =
-                        (s->mb_height * (i + 1) + nb_slices / 2) / nb_slices;
+                s->thread_context[i]->start_mb_y =
+                    (s->mb_height * (i) + nb_slices / 2) / nb_slices;
+                s->thread_context[i]->end_mb_y   =
+                    (s->mb_height * (i + 1) + nb_slices / 2) / nb_slices;
             }
         } else {
-            if (init_duplicate_context(s) < 0)
+            err = init_duplicate_context(s);
+            if (err < 0)
                 goto fail;
             s->start_mb_y = 0;
             s->end_mb_y   = s->mb_height;
@@ -1481,6 +1123,9 @@ void ff_mpv_common_end(MpegEncContext *s)
 {
     int i;
 
+    if (!s)
+        return ;
+
     if (s->slice_context_count > 1) {
         for (i = 0; i < s->slice_context_count; i++) {
             free_duplicate_context(s->thread_context[i]);
@@ -1500,22 +1145,22 @@ void ff_mpv_common_end(MpegEncContext *s)
     if (s->picture) {
         for (i = 0; i < MAX_PICTURE_COUNT; i++) {
             ff_free_picture_tables(&s->picture[i]);
-            ff_mpeg_unref_picture(s, &s->picture[i]);
+            ff_mpeg_unref_picture(s->avctx, &s->picture[i]);
             av_frame_free(&s->picture[i].f);
         }
     }
     av_freep(&s->picture);
     ff_free_picture_tables(&s->last_picture);
-    ff_mpeg_unref_picture(s, &s->last_picture);
+    ff_mpeg_unref_picture(s->avctx, &s->last_picture);
     av_frame_free(&s->last_picture.f);
     ff_free_picture_tables(&s->current_picture);
-    ff_mpeg_unref_picture(s, &s->current_picture);
+    ff_mpeg_unref_picture(s->avctx, &s->current_picture);
     av_frame_free(&s->current_picture.f);
     ff_free_picture_tables(&s->next_picture);
-    ff_mpeg_unref_picture(s, &s->next_picture);
+    ff_mpeg_unref_picture(s->avctx, &s->next_picture);
     av_frame_free(&s->next_picture.f);
     ff_free_picture_tables(&s->new_picture);
-    ff_mpeg_unref_picture(s, &s->new_picture);
+    ff_mpeg_unref_picture(s->avctx, &s->new_picture);
     av_frame_free(&s->new_picture.f);
 
     free_context_frame(s);
@@ -1527,149 +1172,21 @@ void ff_mpv_common_end(MpegEncContext *s)
     s->linesize = s->uvlinesize = 0;
 }
 
-av_cold void ff_init_rl(RLTable *rl,
-                        uint8_t static_store[2][2 * MAX_RUN + MAX_LEVEL + 3])
-{
-    int8_t  max_level[MAX_RUN + 1], max_run[MAX_LEVEL + 1];
-    uint8_t index_run[MAX_RUN + 1];
-    int last, run, level, start, end, i;
-
-    /* If table is static, we can quit if rl->max_level[0] is not NULL */
-    if (static_store && rl->max_level[0])
-        return;
-
-    /* compute max_level[], max_run[] and index_run[] */
-    for (last = 0; last < 2; last++) {
-        if (last == 0) {
-            start = 0;
-            end = rl->last;
-        } else {
-            start = rl->last;
-            end = rl->n;
-        }
-
-        memset(max_level, 0, MAX_RUN + 1);
-        memset(max_run, 0, MAX_LEVEL + 1);
-        memset(index_run, rl->n, MAX_RUN + 1);
-        for (i = start; i < end; i++) {
-            run   = rl->table_run[i];
-            level = rl->table_level[i];
-            if (index_run[run] == rl->n)
-                index_run[run] = i;
-            if (level > max_level[run])
-                max_level[run] = level;
-            if (run > max_run[level])
-                max_run[level] = run;
-        }
-        if (static_store)
-            rl->max_level[last] = static_store[last];
-        else
-            rl->max_level[last] = av_malloc(MAX_RUN + 1);
-        memcpy(rl->max_level[last], max_level, MAX_RUN + 1);
-        if (static_store)
-            rl->max_run[last]   = static_store[last] + MAX_RUN + 1;
-        else
-            rl->max_run[last]   = av_malloc(MAX_LEVEL + 1);
-        memcpy(rl->max_run[last], max_run, MAX_LEVEL + 1);
-        if (static_store)
-            rl->index_run[last] = static_store[last] + MAX_RUN + MAX_LEVEL + 2;
-        else
-            rl->index_run[last] = av_malloc(MAX_RUN + 1);
-        memcpy(rl->index_run[last], index_run, MAX_RUN + 1);
-    }
-}
-
-av_cold void ff_init_vlc_rl(RLTable *rl)
-{
-    int i, q;
-
-    for (q = 0; q < 32; q++) {
-        int qmul = q * 2;
-        int qadd = (q - 1) | 1;
 
-        if (q == 0) {
-            qmul = 1;
-            qadd = 0;
-        }
-        for (i = 0; i < rl->vlc.table_size; i++) {
-            int code = rl->vlc.table[i][0];
-            int len  = rl->vlc.table[i][1];
-            int level, run;
-
-            if (len == 0) { // illegal code
-                run   = 66;
-                level = MAX_LEVEL;
-            } else if (len < 0) { // more bits needed
-                run   = 0;
-                level = code;
-            } else {
-                if (code == rl->n) { // esc
-                    run   = 66;
-                    level =  0;
-                } else {
-                    run   = rl->table_run[code] + 1;
-                    level = rl->table_level[code] * qmul + qadd;
-                    if (code >= rl->last) run += 192;
-                }
-            }
-            rl->rl_vlc[q][i].len   = len;
-            rl->rl_vlc[q][i].level = level;
-            rl->rl_vlc[q][i].run   = run;
-        }
-    }
-}
-
-static void release_unused_pictures(MpegEncContext *s)
+static void gray_frame(AVFrame *frame)
 {
-    int i;
+    int i, h_chroma_shift, v_chroma_shift;
 
-    /* release non reference frames */
-    for (i = 0; i < MAX_PICTURE_COUNT; i++) {
-        if (!s->picture[i].reference)
-            ff_mpeg_unref_picture(s, &s->picture[i]);
-    }
-}
-
-static inline int pic_is_unused(MpegEncContext *s, Picture *pic)
-{
-    if (!pic->f->buf[0])
-        return 1;
-    if (pic->needs_realloc && !(pic->reference & DELAYED_PIC_REF))
-        return 1;
-    return 0;
-}
-
-static int find_unused_picture(MpegEncContext *s, int shared)
-{
-    int i;
-
-    if (shared) {
-        for (i = 0; i < MAX_PICTURE_COUNT; i++) {
-            if (!s->picture[i].f->buf[0])
-                return i;
-        }
-    } else {
-        for (i = 0; i < MAX_PICTURE_COUNT; i++) {
-            if (pic_is_unused(s, &s->picture[i]))
-                return i;
-        }
-    }
-
-    return AVERROR_INVALIDDATA;
-}
+    av_pix_fmt_get_chroma_sub_sample(frame->format, &h_chroma_shift, &v_chroma_shift);
 
-int ff_find_unused_picture(MpegEncContext *s, int shared)
-{
-    int ret = find_unused_picture(s, shared);
-
-    if (ret >= 0 && ret < MAX_PICTURE_COUNT) {
-        if (s->picture[ret].needs_realloc) {
-            s->picture[ret].needs_realloc = 0;
-            ff_free_picture_tables(&s->picture[ret]);
-            ff_mpeg_unref_picture(s, &s->picture[ret]);
-        }
+    for(i=0; i<frame->height; i++)
+        memset(frame->data[0] + frame->linesize[0]*i, 0x80, frame->width);
+    for(i=0; i<AV_CEIL_RSHIFT(frame->height, v_chroma_shift); i++) {
+        memset(frame->data[1] + frame->linesize[1]*i,
+               0x80, AV_CEIL_RSHIFT(frame->width, h_chroma_shift));
+        memset(frame->data[2] + frame->linesize[2]*i,
+               0x80, AV_CEIL_RSHIFT(frame->width, h_chroma_shift));
     }
-    return ret;
 }
 
 /**
@@ -1682,36 +1199,44 @@ int ff_mpv_frame_start(MpegEncContext *s, AVCodecContext *avctx)
     Picture *pic;
     s->mb_skipped = 0;
 
+    if (!ff_thread_can_start_frame(avctx)) {
+        av_log(avctx, AV_LOG_ERROR, "Attempt to start a frame outside SETUP state\n");
+        return -1;
+    }
+
     /* mark & release old frames */
     if (s->pict_type != AV_PICTURE_TYPE_B && s->last_picture_ptr &&
         s->last_picture_ptr != s->next_picture_ptr &&
         s->last_picture_ptr->f->buf[0]) {
-        ff_mpeg_unref_picture(s, s->last_picture_ptr);
+        ff_mpeg_unref_picture(s->avctx, s->last_picture_ptr);
     }
 
     /* release forgotten pictures */
-    /* if (mpeg124/h263) */
+    /* if (MPEG-124 / H.263) */
     for (i = 0; i < MAX_PICTURE_COUNT; i++) {
         if (&s->picture[i] != s->last_picture_ptr &&
             &s->picture[i] != s->next_picture_ptr &&
             s->picture[i].reference && !s->picture[i].needs_realloc) {
-            if (!(avctx->active_thread_type & FF_THREAD_FRAME))
-                av_log(avctx, AV_LOG_ERROR,
-                       "releasing zombie picture\n");
-            ff_mpeg_unref_picture(s, &s->picture[i]);
+            ff_mpeg_unref_picture(s->avctx, &s->picture[i]);
         }
     }
 
-    ff_mpeg_unref_picture(s, &s->current_picture);
+    ff_mpeg_unref_picture(s->avctx, &s->current_picture);
+    ff_mpeg_unref_picture(s->avctx, &s->last_picture);
+    ff_mpeg_unref_picture(s->avctx, &s->next_picture);
 
-    release_unused_pictures(s);
+    /* release non reference frames */
+    for (i = 0; i < MAX_PICTURE_COUNT; i++) {
+        if (!s->picture[i].reference)
+            ff_mpeg_unref_picture(s->avctx, &s->picture[i]);
+    }
 
     if (s->current_picture_ptr && !s->current_picture_ptr->f->buf[0]) {
-        // we already have a unused image
+        // we already have an unused image
         // (maybe it was set before reading the header)
         pic = s->current_picture_ptr;
     } else {
-        i   = ff_find_unused_picture(s, 0);
+        i   = ff_find_unused_picture(s->avctx, s->picture, 0);
         if (i < 0) {
             av_log(s->avctx, AV_LOG_ERROR, "no frame buffer available\n");
             return i;
@@ -1727,7 +1252,7 @@ int ff_mpv_frame_start(MpegEncContext *s, AVCodecContext *avctx)
 
     pic->f->coded_picture_number = s->coded_picture_number++;
 
-    if (ff_alloc_picture(s, pic, 0) < 0)
+    if (alloc_picture(s, pic, 0) < 0)
         return -1;
 
     s->current_picture_ptr = pic;
@@ -1744,11 +1269,11 @@ int ff_mpv_frame_start(MpegEncContext *s, AVCodecContext *avctx)
     s->current_picture_ptr->field_picture      =  s->picture_structure != PICT_FRAME;
 
     s->current_picture_ptr->f->pict_type = s->pict_type;
-    // if (s->flags && CODEC_FLAG_QSCALE)
+    // if (s->avctx->flags && AV_CODEC_FLAG_QSCALE)
     //     s->current_picture_ptr->quality = s->new_picture_ptr->quality;
     s->current_picture_ptr->f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
 
-    if ((ret = ff_mpeg_ref_picture(s, &s->current_picture,
+    if ((ret = ff_mpeg_ref_picture(s->avctx, &s->current_picture,
                                    s->current_picture_ptr)) < 0)
         return ret;
 
@@ -1765,20 +1290,19 @@ int ff_mpv_frame_start(MpegEncContext *s, AVCodecContext *avctx)
             s->pict_type, s->droppable);
 
     if ((!s->last_picture_ptr || !s->last_picture_ptr->f->buf[0]) &&
-        (s->pict_type != AV_PICTURE_TYPE_I ||
-         s->picture_structure != PICT_FRAME)) {
+        (s->pict_type != AV_PICTURE_TYPE_I)) {
         int h_chroma_shift, v_chroma_shift;
         av_pix_fmt_get_chroma_sub_sample(s->avctx->pix_fmt,
                                          &h_chroma_shift, &v_chroma_shift);
-        if (s->pict_type != AV_PICTURE_TYPE_I)
+        if (s->pict_type == AV_PICTURE_TYPE_B && s->next_picture_ptr && s->next_picture_ptr->f->buf[0])
+            av_log(avctx, AV_LOG_DEBUG,
+                   "allocating dummy last picture for B frame\n");
+        else if (s->pict_type != AV_PICTURE_TYPE_I)
             av_log(avctx, AV_LOG_ERROR,
                    "warning: first frame is no keyframe\n");
-        else if (s->picture_structure != PICT_FRAME)
-            av_log(avctx, AV_LOG_INFO,
-                   "allocate dummy last picture for field based first keyframe\n");
 
         /* Allocate a dummy frame */
-        i = ff_find_unused_picture(s, 0);
+        i = ff_find_unused_picture(s->avctx, s->picture, 0);
         if (i < 0) {
             av_log(s->avctx, AV_LOG_ERROR, "no frame buffer available\n");
             return i;
@@ -1786,21 +1310,32 @@ int ff_mpv_frame_start(MpegEncContext *s, AVCodecContext *avctx)
         s->last_picture_ptr = &s->picture[i];
 
         s->last_picture_ptr->reference   = 3;
-        s->last_picture_ptr->f->pict_type = AV_PICTURE_TYPE_I;
+        s->last_picture_ptr->f->key_frame = 0;
+        s->last_picture_ptr->f->pict_type = AV_PICTURE_TYPE_P;
 
-        if (ff_alloc_picture(s, s->last_picture_ptr, 0) < 0) {
+        if (alloc_picture(s, s->last_picture_ptr, 0) < 0) {
             s->last_picture_ptr = NULL;
             return -1;
         }
 
-        memset(s->last_picture_ptr->f->data[0], 0,
-               avctx->height * s->last_picture_ptr->f->linesize[0]);
-        memset(s->last_picture_ptr->f->data[1], 0x80,
-               (avctx->height >> v_chroma_shift) *
-               s->last_picture_ptr->f->linesize[1]);
-        memset(s->last_picture_ptr->f->data[2], 0x80,
-               (avctx->height >> v_chroma_shift) *
-               s->last_picture_ptr->f->linesize[2]);
+        if (!avctx->hwaccel) {
+            for(i=0; i<avctx->height; i++)
+                memset(s->last_picture_ptr->f->data[0] + s->last_picture_ptr->f->linesize[0]*i,
+                       0x80, avctx->width);
+            if (s->last_picture_ptr->f->data[2]) {
+                for(i=0; i<AV_CEIL_RSHIFT(avctx->height, v_chroma_shift); i++) {
+                    memset(s->last_picture_ptr->f->data[1] + s->last_picture_ptr->f->linesize[1]*i,
+                        0x80, AV_CEIL_RSHIFT(avctx->width, h_chroma_shift));
+                    memset(s->last_picture_ptr->f->data[2] + s->last_picture_ptr->f->linesize[2]*i,
+                        0x80, AV_CEIL_RSHIFT(avctx->width, h_chroma_shift));
+                }
+            }
+
+            if(s->codec_id == AV_CODEC_ID_FLV1 || s->codec_id == AV_CODEC_ID_H263){
+                for(i=0; i<avctx->height; i++)
+                memset(s->last_picture_ptr->f->data[0] + s->last_picture_ptr->f->linesize[0]*i, 16, avctx->width);
+            }
+        }
 
         ff_thread_report_progress(&s->last_picture_ptr->tf, INT_MAX, 0);
         ff_thread_report_progress(&s->last_picture_ptr->tf, INT_MAX, 1);
@@ -1808,7 +1343,7 @@ int ff_mpv_frame_start(MpegEncContext *s, AVCodecContext *avctx)
     if ((!s->next_picture_ptr || !s->next_picture_ptr->f->buf[0]) &&
         s->pict_type == AV_PICTURE_TYPE_B) {
         /* Allocate a dummy frame */
-        i = ff_find_unused_picture(s, 0);
+        i = ff_find_unused_picture(s->avctx, s->picture, 0);
         if (i < 0) {
             av_log(s->avctx, AV_LOG_ERROR, "no frame buffer available\n");
             return i;
@@ -1816,9 +1351,10 @@ int ff_mpv_frame_start(MpegEncContext *s, AVCodecContext *avctx)
         s->next_picture_ptr = &s->picture[i];
 
         s->next_picture_ptr->reference   = 3;
-        s->next_picture_ptr->f->pict_type = AV_PICTURE_TYPE_I;
+        s->next_picture_ptr->f->key_frame = 0;
+        s->next_picture_ptr->f->pict_type = AV_PICTURE_TYPE_P;
 
-        if (ff_alloc_picture(s, s->next_picture_ptr, 0) < 0) {
+        if (alloc_picture(s, s->next_picture_ptr, 0) < 0) {
             s->next_picture_ptr = NULL;
             return -1;
         }
@@ -1826,27 +1362,25 @@ int ff_mpv_frame_start(MpegEncContext *s, AVCodecContext *avctx)
         ff_thread_report_progress(&s->next_picture_ptr->tf, INT_MAX, 1);
     }
 
+#if 0 // BUFREF-FIXME
+    memset(s->last_picture.f->data, 0, sizeof(s->last_picture.f->data));
+    memset(s->next_picture.f->data, 0, sizeof(s->next_picture.f->data));
+#endif
     if (s->last_picture_ptr) {
-        ff_mpeg_unref_picture(s, &s->last_picture);
         if (s->last_picture_ptr->f->buf[0] &&
-            (ret = ff_mpeg_ref_picture(s, &s->last_picture,
+            (ret = ff_mpeg_ref_picture(s->avctx, &s->last_picture,
                                        s->last_picture_ptr)) < 0)
             return ret;
     }
     if (s->next_picture_ptr) {
-        ff_mpeg_unref_picture(s, &s->next_picture);
         if (s->next_picture_ptr->f->buf[0] &&
-            (ret = ff_mpeg_ref_picture(s, &s->next_picture,
+            (ret = ff_mpeg_ref_picture(s->avctx, &s->next_picture,
                                        s->next_picture_ptr)) < 0)
             return ret;
     }
 
-    if (s->pict_type != AV_PICTURE_TYPE_I &&
-        !(s->last_picture_ptr && s->last_picture_ptr->f->buf[0])) {
-        av_log(s, AV_LOG_ERROR,
-               "Non-reference picture received and no reference available\n");
-        return AVERROR_INVALIDDATA;
-    }
+    av_assert0(s->pict_type == AV_PICTURE_TYPE_I || (s->last_picture_ptr &&
+                                                 s->last_picture_ptr->f->buf[0]));
 
     if (s->picture_structure!= PICT_FRAME) {
         int i;
@@ -1861,11 +1395,9 @@ int ff_mpv_frame_start(MpegEncContext *s, AVCodecContext *avctx)
         }
     }
 
-    s->err_recognition = avctx->err_recognition;
-
     /* set dequantizer, we can't do it during init as
-     * it might change for mpeg4 and we can't do it in the header
-     * decode as init is not called for mpeg4 there yet */
+     * it might change for MPEG-4 and we can't do it in the header
+     * decode as init is not called for MPEG-4 there yet */
     if (s->mpeg_quant || s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
         s->dct_unquantize_intra = s->dct_unquantize_mpeg2_intra;
         s->dct_unquantize_inter = s->dct_unquantize_mpeg2_inter;
@@ -1877,12 +1409,9 @@ int ff_mpv_frame_start(MpegEncContext *s, AVCodecContext *avctx)
         s->dct_unquantize_inter = s->dct_unquantize_mpeg1_inter;
     }
 
-#if FF_API_XVMC
-FF_DISABLE_DEPRECATION_WARNINGS
-    if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
-        return ff_xvmc_field_start(s, avctx);
-FF_ENABLE_DEPRECATION_WARNINGS
-#endif /* FF_API_XVMC */
+    if (s->avctx->debug & FF_DEBUG_NOMC) {
+        gray_frame(s->current_picture_ptr->f);
+    }
 
     return 0;
 }
@@ -1890,126 +1419,420 @@ FF_ENABLE_DEPRECATION_WARNINGS
 /* called after a frame has been decoded. */
 void ff_mpv_frame_end(MpegEncContext *s)
 {
-#if FF_API_XVMC
-FF_DISABLE_DEPRECATION_WARNINGS
-    /* redraw edges for the frame if decoding didn't complete */
-    // just to make sure that all data is rendered.
-    if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration) {
-        ff_xvmc_field_end(s);
-    } else
-FF_ENABLE_DEPRECATION_WARNINGS
-#endif /* FF_API_XVMC */
-
     emms_c();
 
     if (s->current_picture.reference)
         ff_thread_report_progress(&s->current_picture_ptr->tf, INT_MAX, 0);
 }
 
+void ff_print_debug_info(MpegEncContext *s, Picture *p, AVFrame *pict)
+{
+    ff_print_debug_info2(s->avctx, pict, s->mbskip_table, p->mb_type,
+                         p->qscale_table, p->motion_val, &s->low_delay,
+                         s->mb_width, s->mb_height, s->mb_stride, s->quarter_sample);
+}
+
+int ff_mpv_export_qp_table(MpegEncContext *s, AVFrame *f, Picture *p, int qp_type)
+{
+    AVBufferRef *ref = av_buffer_ref(p->qscale_table_buf);
+    int offset = 2*s->mb_stride + 1;
+    if(!ref)
+        return AVERROR(ENOMEM);
+    av_assert0(ref->size >= offset + s->mb_stride * ((f->height+15)/16));
+    ref->size -= offset;
+    ref->data += offset;
+    return av_frame_set_qp_table(f, ref, s->mb_stride, qp_type);
+}
+
+static inline int hpel_motion_lowres(MpegEncContext *s,
+                                     uint8_t *dest, uint8_t *src,
+                                     int field_based, int field_select,
+                                     int src_x, int src_y,
+                                     int width, int height, ptrdiff_t stride,
+                                     int h_edge_pos, int v_edge_pos,
+                                     int w, int h, h264_chroma_mc_func *pix_op,
+                                     int motion_x, int motion_y)
+{
+    const int lowres   = s->avctx->lowres;
+    const int op_index = FFMIN(lowres, 3);
+    const int s_mask   = (2 << lowres) - 1;
+    int emu = 0;
+    int sx, sy;
+
+    if (s->quarter_sample) {
+        motion_x /= 2;
+        motion_y /= 2;
+    }
+
+    sx = motion_x & s_mask;
+    sy = motion_y & s_mask;
+    src_x += motion_x >> lowres + 1;
+    src_y += motion_y >> lowres + 1;
+
+    src   += src_y * stride + src_x;
+
+    if ((unsigned)src_x > FFMAX( h_edge_pos - (!!sx) - w,                 0) ||
+        (unsigned)src_y > FFMAX((v_edge_pos >> field_based) - (!!sy) - h, 0)) {
+        s->vdsp.emulated_edge_mc(s->sc.edge_emu_buffer, src,
+                                 s->linesize, s->linesize,
+                                 w + 1, (h + 1) << field_based,
+                                 src_x, src_y   << field_based,
+                                 h_edge_pos, v_edge_pos);
+        src = s->sc.edge_emu_buffer;
+        emu = 1;
+    }
+
+    sx = (sx << 2) >> lowres;
+    sy = (sy << 2) >> lowres;
+    if (field_select)
+        src += s->linesize;
+    pix_op[op_index](dest, src, stride, h, sx, sy);
+    return emu;
+}
+
+/* apply one mpeg motion vector to the three components */
+static av_always_inline void mpeg_motion_lowres(MpegEncContext *s,
+                                                uint8_t *dest_y,
+                                                uint8_t *dest_cb,
+                                                uint8_t *dest_cr,
+                                                int field_based,
+                                                int bottom_field,
+                                                int field_select,
+                                                uint8_t **ref_picture,
+                                                h264_chroma_mc_func *pix_op,
+                                                int motion_x, int motion_y,
+                                                int h, int mb_y)
+{
+    uint8_t *ptr_y, *ptr_cb, *ptr_cr;
+    int mx, my, src_x, src_y, uvsrc_x, uvsrc_y, sx, sy, uvsx, uvsy;
+    ptrdiff_t uvlinesize, linesize;
+    const int lowres     = s->avctx->lowres;
+    const int op_index   = FFMIN(lowres-1+s->chroma_x_shift, 3);
+    const int block_s    = 8>>lowres;
+    const int s_mask     = (2 << lowres) - 1;
+    const int h_edge_pos = s->h_edge_pos >> lowres;
+    const int v_edge_pos = s->v_edge_pos >> lowres;
+    linesize   = s->current_picture.f->linesize[0] << field_based;
+    uvlinesize = s->current_picture.f->linesize[1] << field_based;
+
+    // FIXME obviously not perfect but qpel will not work in lowres anyway
+    if (s->quarter_sample) {
+        motion_x /= 2;
+        motion_y /= 2;
+    }
+
+    if(field_based){
+        motion_y += (bottom_field - field_select)*((1 << lowres)-1);
+    }
+
+    sx = motion_x & s_mask;
+    sy = motion_y & s_mask;
+    src_x = s->mb_x * 2 * block_s + (motion_x >> lowres + 1);
+    src_y = (mb_y * 2 * block_s >> field_based) + (motion_y >> lowres + 1);
+
+    if (s->out_format == FMT_H263) {
+        uvsx    = ((motion_x >> 1) & s_mask) | (sx & 1);
+        uvsy    = ((motion_y >> 1) & s_mask) | (sy & 1);
+        uvsrc_x = src_x >> 1;
+        uvsrc_y = src_y >> 1;
+    } else if (s->out_format == FMT_H261) {
+        // even chroma mv's are full pel in H261
+        mx      = motion_x / 4;
+        my      = motion_y / 4;
+        uvsx    = (2 * mx) & s_mask;
+        uvsy    = (2 * my) & s_mask;
+        uvsrc_x = s->mb_x * block_s + (mx >> lowres);
+        uvsrc_y =    mb_y * block_s + (my >> lowres);
+    } else {
+        if(s->chroma_y_shift){
+            mx      = motion_x / 2;
+            my      = motion_y / 2;
+            uvsx    = mx & s_mask;
+            uvsy    = my & s_mask;
+            uvsrc_x = s->mb_x * block_s                 + (mx >> lowres + 1);
+            uvsrc_y =   (mb_y * block_s >> field_based) + (my >> lowres + 1);
+        } else {
+            if(s->chroma_x_shift){
+            //Chroma422
+                mx = motion_x / 2;
+                uvsx = mx & s_mask;
+                uvsy = motion_y & s_mask;
+                uvsrc_y = src_y;
+                uvsrc_x = s->mb_x*block_s               + (mx >> (lowres+1));
+            } else {
+            //Chroma444
+                uvsx = motion_x & s_mask;
+                uvsy = motion_y & s_mask;
+                uvsrc_x = src_x;
+                uvsrc_y = src_y;
+            }
+        }
+    }
+
+    ptr_y  = ref_picture[0] + src_y   * linesize   + src_x;
+    ptr_cb = ref_picture[1] + uvsrc_y * uvlinesize + uvsrc_x;
+    ptr_cr = ref_picture[2] + uvsrc_y * uvlinesize + uvsrc_x;
+
+    if ((unsigned) src_x > FFMAX( h_edge_pos - (!!sx) - 2 * block_s,       0) || uvsrc_y<0 ||
+        (unsigned) src_y > FFMAX((v_edge_pos >> field_based) - (!!sy) - h, 0)) {
+        s->vdsp.emulated_edge_mc(s->sc.edge_emu_buffer, ptr_y,
+                                 linesize >> field_based, linesize >> field_based,
+                                 17, 17 + field_based,
+                                src_x, src_y << field_based, h_edge_pos,
+                                v_edge_pos);
+        ptr_y = s->sc.edge_emu_buffer;
+        if (!CONFIG_GRAY || !(s->avctx->flags & AV_CODEC_FLAG_GRAY)) {
+            uint8_t *ubuf = s->sc.edge_emu_buffer + 18 * s->linesize;
+            uint8_t *vbuf =ubuf + 10 * s->uvlinesize;
+            if (s->workaround_bugs & FF_BUG_IEDGE)
+                vbuf -= s->uvlinesize;
+            s->vdsp.emulated_edge_mc(ubuf,  ptr_cb,
+                                     uvlinesize >> field_based, uvlinesize >> field_based,
+                                     9, 9 + field_based,
+                                    uvsrc_x, uvsrc_y << field_based,
+                                    h_edge_pos >> 1, v_edge_pos >> 1);
+            s->vdsp.emulated_edge_mc(vbuf,  ptr_cr,
+                                     uvlinesize >> field_based,uvlinesize >> field_based,
+                                     9, 9 + field_based,
+                                    uvsrc_x, uvsrc_y << field_based,
+                                    h_edge_pos >> 1, v_edge_pos >> 1);
+            ptr_cb = ubuf;
+            ptr_cr = vbuf;
+        }
+    }
+
+    // FIXME use this for field pix too instead of the obnoxious hack which changes picture.f->data
+    if (bottom_field) {
+        dest_y  += s->linesize;
+        dest_cb += s->uvlinesize;
+        dest_cr += s->uvlinesize;
+    }
+
+    if (field_select) {
+        ptr_y   += s->linesize;
+        ptr_cb  += s->uvlinesize;
+        ptr_cr  += s->uvlinesize;
+    }
+
+    sx = (sx << 2) >> lowres;
+    sy = (sy << 2) >> lowres;
+    pix_op[lowres - 1](dest_y, ptr_y, linesize, h, sx, sy);
+
+    if (!CONFIG_GRAY || !(s->avctx->flags & AV_CODEC_FLAG_GRAY)) {
+        int hc = s->chroma_y_shift ? (h+1-bottom_field)>>1 : h;
+        uvsx = (uvsx << 2) >> lowres;
+        uvsy = (uvsy << 2) >> lowres;
+        if (hc) {
+            pix_op[op_index](dest_cb, ptr_cb, uvlinesize, hc, uvsx, uvsy);
+            pix_op[op_index](dest_cr, ptr_cr, uvlinesize, hc, uvsx, uvsy);
+        }
+    }
+    // FIXME h261 lowres loop filter
+}
+
+static inline void chroma_4mv_motion_lowres(MpegEncContext *s,
+                                            uint8_t *dest_cb, uint8_t *dest_cr,
+                                            uint8_t **ref_picture,
+                                            h264_chroma_mc_func * pix_op,
+                                            int mx, int my)
+{
+    const int lowres     = s->avctx->lowres;
+    const int op_index   = FFMIN(lowres, 3);
+    const int block_s    = 8 >> lowres;
+    const int s_mask     = (2 << lowres) - 1;
+    const int h_edge_pos = s->h_edge_pos >> lowres + 1;
+    const int v_edge_pos = s->v_edge_pos >> lowres + 1;
+    int emu = 0, src_x, src_y, sx, sy;
+    ptrdiff_t offset;
+    uint8_t *ptr;
+
+    if (s->quarter_sample) {
+        mx /= 2;
+        my /= 2;
+    }
+
+    /* In case of 8X8, we construct a single chroma motion vector
+       with a special rounding */
+    mx = ff_h263_round_chroma(mx);
+    my = ff_h263_round_chroma(my);
+
+    sx = mx & s_mask;
+    sy = my & s_mask;
+    src_x = s->mb_x * block_s + (mx >> lowres + 1);
+    src_y = s->mb_y * block_s + (my >> lowres + 1);
+
+    offset = src_y * s->uvlinesize + src_x;
+    ptr = ref_picture[1] + offset;
+    if ((unsigned) src_x > FFMAX(h_edge_pos - (!!sx) - block_s, 0) ||
+        (unsigned) src_y > FFMAX(v_edge_pos - (!!sy) - block_s, 0)) {
+        s->vdsp.emulated_edge_mc(s->sc.edge_emu_buffer, ptr,
+                                 s->uvlinesize, s->uvlinesize,
+                                 9, 9,
+                                 src_x, src_y, h_edge_pos, v_edge_pos);
+        ptr = s->sc.edge_emu_buffer;
+        emu = 1;
+    }
+    sx = (sx << 2) >> lowres;
+    sy = (sy << 2) >> lowres;
+    pix_op[op_index](dest_cb, ptr, s->uvlinesize, block_s, sx, sy);
+
+    ptr = ref_picture[2] + offset;
+    if (emu) {
+        s->vdsp.emulated_edge_mc(s->sc.edge_emu_buffer, ptr,
+                                 s->uvlinesize, s->uvlinesize,
+                                 9, 9,
+                                 src_x, src_y, h_edge_pos, v_edge_pos);
+        ptr = s->sc.edge_emu_buffer;
+    }
+    pix_op[op_index](dest_cr, ptr, s->uvlinesize, block_s, sx, sy);
+}
+
 /**
- * Print debugging info for the given picture.
+ * motion compensation of a single macroblock
+ * @param s context
+ * @param dest_y luma destination pointer
+ * @param dest_cb chroma cb/u destination pointer
+ * @param dest_cr chroma cr/v destination pointer
+ * @param dir direction (0->forward, 1->backward)
+ * @param ref_picture array[3] of pointers to the 3 planes of the reference picture
+ * @param pix_op halfpel motion compensation function (average or put normally)
+ * the motion vectors are taken from s->mv and the MV type from s->mv_type
  */
-void ff_print_debug_info(MpegEncContext *s, Picture *p)
+static inline void MPV_motion_lowres(MpegEncContext *s,
+                                     uint8_t *dest_y, uint8_t *dest_cb,
+                                     uint8_t *dest_cr,
+                                     int dir, uint8_t **ref_picture,
+                                     h264_chroma_mc_func *pix_op)
 {
-    AVFrame *pict;
-    if (s->avctx->hwaccel || !p || !p->mb_type)
-        return;
-    pict = p->f;
+    int mx, my;
+    int mb_x, mb_y, i;
+    const int lowres  = s->avctx->lowres;
+    const int block_s = 8 >>lowres;
 
-    if (s->avctx->debug & (FF_DEBUG_SKIP | FF_DEBUG_QP | FF_DEBUG_MB_TYPE)) {
-        int x,y;
+    mb_x = s->mb_x;
+    mb_y = s->mb_y;
 
-        av_log(s->avctx,AV_LOG_DEBUG,"New frame, type: ");
-        switch (pict->pict_type) {
-        case AV_PICTURE_TYPE_I:
-            av_log(s->avctx,AV_LOG_DEBUG,"I\n");
-            break;
-        case AV_PICTURE_TYPE_P:
-            av_log(s->avctx,AV_LOG_DEBUG,"P\n");
-            break;
-        case AV_PICTURE_TYPE_B:
-            av_log(s->avctx,AV_LOG_DEBUG,"B\n");
-            break;
-        case AV_PICTURE_TYPE_S:
-            av_log(s->avctx,AV_LOG_DEBUG,"S\n");
-            break;
-        case AV_PICTURE_TYPE_SI:
-            av_log(s->avctx,AV_LOG_DEBUG,"SI\n");
-            break;
-        case AV_PICTURE_TYPE_SP:
-            av_log(s->avctx,AV_LOG_DEBUG,"SP\n");
-            break;
+    switch (s->mv_type) {
+    case MV_TYPE_16X16:
+        mpeg_motion_lowres(s, dest_y, dest_cb, dest_cr,
+                           0, 0, 0,
+                           ref_picture, pix_op,
+                           s->mv[dir][0][0], s->mv[dir][0][1],
+                           2 * block_s, mb_y);
+        break;
+    case MV_TYPE_8X8:
+        mx = 0;
+        my = 0;
+        for (i = 0; i < 4; i++) {
+            hpel_motion_lowres(s, dest_y + ((i & 1) + (i >> 1) *
+                               s->linesize) * block_s,
+                               ref_picture[0], 0, 0,
+                               (2 * mb_x + (i & 1)) * block_s,
+                               (2 * mb_y + (i >> 1)) * block_s,
+                               s->width, s->height, s->linesize,
+                               s->h_edge_pos >> lowres, s->v_edge_pos >> lowres,
+                               block_s, block_s, pix_op,
+                               s->mv[dir][i][0], s->mv[dir][i][1]);
+
+            mx += s->mv[dir][i][0];
+            my += s->mv[dir][i][1];
         }
-        for (y = 0; y < s->mb_height; y++) {
-            for (x = 0; x < s->mb_width; x++) {
-                if (s->avctx->debug & FF_DEBUG_SKIP) {
-                    int count = s->mbskip_table[x + y * s->mb_stride];
-                    if (count > 9)
-                        count = 9;
-                    av_log(s->avctx, AV_LOG_DEBUG, "%1d", count);
-                }
-                if (s->avctx->debug & FF_DEBUG_QP) {
-                    av_log(s->avctx, AV_LOG_DEBUG, "%2d",
-                           p->qscale_table[x + y * s->mb_stride]);
-                }
-                if (s->avctx->debug & FF_DEBUG_MB_TYPE) {
-                    int mb_type = p->mb_type[x + y * s->mb_stride];
-                    // Type & MV direction
-                    if (IS_PCM(mb_type))
-                        av_log(s->avctx, AV_LOG_DEBUG, "P");
-                    else if (IS_INTRA(mb_type) && IS_ACPRED(mb_type))
-                        av_log(s->avctx, AV_LOG_DEBUG, "A");
-                    else if (IS_INTRA4x4(mb_type))
-                        av_log(s->avctx, AV_LOG_DEBUG, "i");
-                    else if (IS_INTRA16x16(mb_type))
-                        av_log(s->avctx, AV_LOG_DEBUG, "I");
-                    else if (IS_DIRECT(mb_type) && IS_SKIP(mb_type))
-                        av_log(s->avctx, AV_LOG_DEBUG, "d");
-                    else if (IS_DIRECT(mb_type))
-                        av_log(s->avctx, AV_LOG_DEBUG, "D");
-                    else if (IS_GMC(mb_type) && IS_SKIP(mb_type))
-                        av_log(s->avctx, AV_LOG_DEBUG, "g");
-                    else if (IS_GMC(mb_type))
-                        av_log(s->avctx, AV_LOG_DEBUG, "G");
-                    else if (IS_SKIP(mb_type))
-                        av_log(s->avctx, AV_LOG_DEBUG, "S");
-                    else if (!USES_LIST(mb_type, 1))
-                        av_log(s->avctx, AV_LOG_DEBUG, ">");
-                    else if (!USES_LIST(mb_type, 0))
-                        av_log(s->avctx, AV_LOG_DEBUG, "<");
-                    else {
-                        assert(USES_LIST(mb_type, 0) && USES_LIST(mb_type, 1));
-                        av_log(s->avctx, AV_LOG_DEBUG, "X");
-                    }
 
-                    // segmentation
-                    if (IS_8X8(mb_type))
-                        av_log(s->avctx, AV_LOG_DEBUG, "+");
-                    else if (IS_16X8(mb_type))
-                        av_log(s->avctx, AV_LOG_DEBUG, "-");
-                    else if (IS_8X16(mb_type))
-                        av_log(s->avctx, AV_LOG_DEBUG, "|");
-                    else if (IS_INTRA(mb_type) || IS_16X16(mb_type))
-                        av_log(s->avctx, AV_LOG_DEBUG, " ");
-                    else
-                        av_log(s->avctx, AV_LOG_DEBUG, "?");
-
-
-                    if (IS_INTERLACED(mb_type))
-                        av_log(s->avctx, AV_LOG_DEBUG, "=");
-                    else
-                        av_log(s->avctx, AV_LOG_DEBUG, " ");
+        if (!CONFIG_GRAY || !(s->avctx->flags & AV_CODEC_FLAG_GRAY))
+            chroma_4mv_motion_lowres(s, dest_cb, dest_cr, ref_picture,
+                                     pix_op, mx, my);
+        break;
+    case MV_TYPE_FIELD:
+        if (s->picture_structure == PICT_FRAME) {
+            /* top field */
+            mpeg_motion_lowres(s, dest_y, dest_cb, dest_cr,
+                               1, 0, s->field_select[dir][0],
+                               ref_picture, pix_op,
+                               s->mv[dir][0][0], s->mv[dir][0][1],
+                               block_s, mb_y);
+            /* bottom field */
+            mpeg_motion_lowres(s, dest_y, dest_cb, dest_cr,
+                               1, 1, s->field_select[dir][1],
+                               ref_picture, pix_op,
+                               s->mv[dir][1][0], s->mv[dir][1][1],
+                               block_s, mb_y);
+        } else {
+            if (s->picture_structure != s->field_select[dir][0] + 1 &&
+                s->pict_type != AV_PICTURE_TYPE_B && !s->first_field) {
+                ref_picture = s->current_picture_ptr->f->data;
+
+            }
+            mpeg_motion_lowres(s, dest_y, dest_cb, dest_cr,
+                               0, 0, s->field_select[dir][0],
+                               ref_picture, pix_op,
+                               s->mv[dir][0][0],
+                               s->mv[dir][0][1], 2 * block_s, mb_y >> 1);
+            }
+        break;
+    case MV_TYPE_16X8:
+        for (i = 0; i < 2; i++) {
+            uint8_t **ref2picture;
+
+            if (s->picture_structure == s->field_select[dir][i] + 1 ||
+                s->pict_type == AV_PICTURE_TYPE_B || s->first_field) {
+                ref2picture = ref_picture;
+            } else {
+                ref2picture = s->current_picture_ptr->f->data;
+            }
+
+            mpeg_motion_lowres(s, dest_y, dest_cb, dest_cr,
+                               0, 0, s->field_select[dir][i],
+                               ref2picture, pix_op,
+                               s->mv[dir][i][0], s->mv[dir][i][1] +
+                               2 * block_s * i, block_s, mb_y >> 1);
+
+            dest_y  +=  2 * block_s *  s->linesize;
+            dest_cb += (2 * block_s >> s->chroma_y_shift) * s->uvlinesize;
+            dest_cr += (2 * block_s >> s->chroma_y_shift) * s->uvlinesize;
+        }
+        break;
+    case MV_TYPE_DMV:
+        if (s->picture_structure == PICT_FRAME) {
+            for (i = 0; i < 2; i++) {
+                int j;
+                for (j = 0; j < 2; j++) {
+                    mpeg_motion_lowres(s, dest_y, dest_cb, dest_cr,
+                                       1, j, j ^ i,
+                                       ref_picture, pix_op,
+                                       s->mv[dir][2 * i + j][0],
+                                       s->mv[dir][2 * i + j][1],
+                                       block_s, mb_y);
+                }
+                pix_op = s->h264chroma.avg_h264_chroma_pixels_tab;
+            }
+        } else {
+            for (i = 0; i < 2; i++) {
+                mpeg_motion_lowres(s, dest_y, dest_cb, dest_cr,
+                                   0, 0, s->picture_structure != i + 1,
+                                   ref_picture, pix_op,
+                                   s->mv[dir][2 * i][0],s->mv[dir][2 * i][1],
+                                   2 * block_s, mb_y >> 1);
+
+                // after put we make avg of the same block
+                pix_op = s->h264chroma.avg_h264_chroma_pixels_tab;
+
+                // opposite parity is always in the same
+                // frame if this is second field
+                if (!s->first_field) {
+                    ref_picture = s->current_picture_ptr->f->data;
                 }
             }
-            av_log(s->avctx, AV_LOG_DEBUG, "\n");
         }
+        break;
+    default:
+        av_assert2(0);
     }
 }
 
 /**
  * find the lowest MB row referenced in the MVs
  */
-int ff_mpv_lowest_referenced_row(MpegEncContext *s, int dir)
+static int lowest_referenced_row(MpegEncContext *s, int dir)
 {
     int my_max = INT_MIN, my_min = INT_MAX, qpel_shift = !s->quarter_sample;
     int my, off, i, mvs;
@@ -2032,14 +1855,14 @@ int ff_mpv_lowest_referenced_row(MpegEncContext *s, int dir)
     }
 
     for (i = 0; i < mvs; i++) {
-        my = s->mv[dir][i][1]<<qpel_shift;
+        my = s->mv[dir][i][1];
         my_max = FFMAX(my_max, my);
         my_min = FFMIN(my_min, my);
     }
 
-    off = (FFMAX(-my_min, my_max) + 63) >> 6;
+    off = ((FFMAX(-my_min, my_max)<<qpel_shift) + 63) >> 6;
 
-    return FFMIN(FFMAX(s->mb_y + off, 0), s->mb_height-1);
+    return av_clip(s->mb_y + off, 0, s->mb_height - 1);
 unhandled:
     return s->mb_height-1;
 }
@@ -2115,19 +1938,16 @@ void ff_clean_intra_table_entries(MpegEncContext *s)
    s->interlaced_dct : true if interlaced dct used (mpeg2)
  */
 static av_always_inline
-void mpv_decode_mb_internal(MpegEncContext *s, int16_t block[12][64],
-                            int is_mpeg12)
+void mpv_reconstruct_mb_internal(MpegEncContext *s, int16_t block[12][64],
+                            int lowres_flag, int is_mpeg12)
 {
     const int mb_xy = s->mb_y * s->mb_stride + s->mb_x;
 
-#if FF_API_XVMC
-FF_DISABLE_DEPRECATION_WARNINGS
-    if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration){
-        ff_xvmc_decode_mb(s);//xvmc uses pblocks
+    if (CONFIG_XVMC &&
+        s->avctx->hwaccel && s->avctx->hwaccel->decode_mb) {
+        s->avctx->hwaccel->decode_mb(s);//xvmc uses pblocks
         return;
     }
-FF_ENABLE_DEPRECATION_WARNINGS
-#endif /* FF_API_XVMC */
 
     if(s->avctx->debug&FF_DEBUG_DCT_COEFF) {
        /* print DCT coefficients */
@@ -2158,15 +1978,17 @@ FF_ENABLE_DEPRECATION_WARNINGS
     else if (!is_mpeg12 && (s->h263_pred || s->h263_aic))
         s->mbintra_table[mb_xy]=1;
 
-    if ((s->flags&CODEC_FLAG_PSNR) || !(s->encoding && (s->intra_only || s->pict_type==AV_PICTURE_TYPE_B) && s->avctx->mb_decision != FF_MB_DECISION_RD)) { //FIXME precalc
+    if ((s->avctx->flags & AV_CODEC_FLAG_PSNR) || s->frame_skip_threshold || s->frame_skip_factor ||
+        !(s->encoding && (s->intra_only || s->pict_type == AV_PICTURE_TYPE_B) &&
+          s->avctx->mb_decision != FF_MB_DECISION_RD)) { // FIXME precalc
         uint8_t *dest_y, *dest_cb, *dest_cr;
         int dct_linesize, dct_offset;
         op_pixels_func (*op_pix)[4];
         qpel_mc_func (*op_qpix)[16];
         const int linesize   = s->current_picture.f->linesize[0]; //not s->linesize as this would be wrong for field pics
         const int uvlinesize = s->current_picture.f->linesize[1];
-        const int readable= s->pict_type != AV_PICTURE_TYPE_B || s->encoding || s->avctx->draw_horiz_band;
-        const int block_size = 8;
+        const int readable= s->pict_type != AV_PICTURE_TYPE_B || s->encoding || s->avctx->draw_horiz_band || lowres_flag;
+        const int block_size= lowres_flag ? 8>>s->avctx->lowres : 8;
 
         /* avoid copy if macroblock skipped in last frame too */
         /* skip only during decoding as we might trash the buffers during encoding a bit */
@@ -2175,7 +1997,7 @@ FF_ENABLE_DEPRECATION_WARNINGS
 
             if (s->mb_skipped) {
                 s->mb_skipped= 0;
-                assert(s->pict_type!=AV_PICTURE_TYPE_I);
+                av_assert2(s->pict_type!=AV_PICTURE_TYPE_I);
                 *mbskip_ptr = 1;
             } else if(!s->current_picture.reference) {
                 *mbskip_ptr = 1;
@@ -2192,9 +2014,9 @@ FF_ENABLE_DEPRECATION_WARNINGS
             dest_cb= s->dest[1];
             dest_cr= s->dest[2];
         }else{
-            dest_y = s->b_scratchpad;
-            dest_cb= s->b_scratchpad+16*linesize;
-            dest_cr= s->b_scratchpad+32*linesize;
+            dest_y = s->sc.b_scratchpad;
+            dest_cb= s->sc.b_scratchpad+16*linesize;
+            dest_cr= s->sc.b_scratchpad+32*linesize;
         }
 
         if (!s->mb_intra) {
@@ -2205,29 +2027,41 @@ FF_ENABLE_DEPRECATION_WARNINGS
                 if(HAVE_THREADS && s->avctx->active_thread_type&FF_THREAD_FRAME) {
                     if (s->mv_dir & MV_DIR_FORWARD) {
                         ff_thread_await_progress(&s->last_picture_ptr->tf,
-                                                 ff_mpv_lowest_referenced_row(s, 0),
+                                                 lowest_referenced_row(s, 0),
                                                  0);
                     }
                     if (s->mv_dir & MV_DIR_BACKWARD) {
                         ff_thread_await_progress(&s->next_picture_ptr->tf,
-                                                 ff_mpv_lowest_referenced_row(s, 1),
+                                                 lowest_referenced_row(s, 1),
                                                  0);
                     }
                 }
 
-                op_qpix= s->me.qpel_put;
-                if ((!s->no_rounding) || s->pict_type==AV_PICTURE_TYPE_B){
-                    op_pix = s->hdsp.put_pixels_tab;
+                if(lowres_flag){
+                    h264_chroma_mc_func *op_pix = s->h264chroma.put_h264_chroma_pixels_tab;
+
+                    if (s->mv_dir & MV_DIR_FORWARD) {
+                        MPV_motion_lowres(s, dest_y, dest_cb, dest_cr, 0, s->last_picture.f->data, op_pix);
+                        op_pix = s->h264chroma.avg_h264_chroma_pixels_tab;
+                    }
+                    if (s->mv_dir & MV_DIR_BACKWARD) {
+                        MPV_motion_lowres(s, dest_y, dest_cb, dest_cr, 1, s->next_picture.f->data, op_pix);
+                    }
                 }else{
-                    op_pix = s->hdsp.put_no_rnd_pixels_tab;
-                }
-                if (s->mv_dir & MV_DIR_FORWARD) {
-                    ff_mpv_motion(s, dest_y, dest_cb, dest_cr, 0, s->last_picture.f->data, op_pix, op_qpix);
-                    op_pix = s->hdsp.avg_pixels_tab;
-                    op_qpix= s->me.qpel_avg;
-                }
-                if (s->mv_dir & MV_DIR_BACKWARD) {
-                    ff_mpv_motion(s, dest_y, dest_cb, dest_cr, 1, s->next_picture.f->data, op_pix, op_qpix);
+                    op_qpix = s->me.qpel_put;
+                    if ((!s->no_rounding) || s->pict_type==AV_PICTURE_TYPE_B){
+                        op_pix = s->hdsp.put_pixels_tab;
+                    }else{
+                        op_pix = s->hdsp.put_no_rnd_pixels_tab;
+                    }
+                    if (s->mv_dir & MV_DIR_FORWARD) {
+                        ff_mpv_motion(s, dest_y, dest_cb, dest_cr, 0, s->last_picture.f->data, op_pix, op_qpix);
+                        op_pix = s->hdsp.avg_pixels_tab;
+                        op_qpix= s->me.qpel_avg;
+                    }
+                    if (s->mv_dir & MV_DIR_BACKWARD) {
+                        ff_mpv_motion(s, dest_y, dest_cb, dest_cr, 1, s->next_picture.f->data, op_pix, op_qpix);
+                    }
                 }
             }
 
@@ -2247,7 +2081,7 @@ FF_ENABLE_DEPRECATION_WARNINGS
                 add_dequant_dct(s, block[2], 2, dest_y + dct_offset             , dct_linesize, s->qscale);
                 add_dequant_dct(s, block[3], 3, dest_y + dct_offset + block_size, dct_linesize, s->qscale);
 
-                if(!CONFIG_GRAY || !(s->flags&CODEC_FLAG_GRAY)){
+                if (!CONFIG_GRAY || !(s->avctx->flags & AV_CODEC_FLAG_GRAY)) {
                     if (s->chroma_y_shift){
                         add_dequant_dct(s, block[4], 4, dest_cb, uvlinesize, s->chroma_qscale);
                         add_dequant_dct(s, block[5], 5, dest_cr, uvlinesize, s->chroma_qscale);
@@ -2266,24 +2100,24 @@ FF_ENABLE_DEPRECATION_WARNINGS
                 add_dct(s, block[2], 2, dest_y + dct_offset             , dct_linesize);
                 add_dct(s, block[3], 3, dest_y + dct_offset + block_size, dct_linesize);
 
-                if(!CONFIG_GRAY || !(s->flags&CODEC_FLAG_GRAY)){
+                if (!CONFIG_GRAY || !(s->avctx->flags & AV_CODEC_FLAG_GRAY)) {
                     if(s->chroma_y_shift){//Chroma420
                         add_dct(s, block[4], 4, dest_cb, uvlinesize);
                         add_dct(s, block[5], 5, dest_cr, uvlinesize);
                     }else{
                         //chroma422
                         dct_linesize = uvlinesize << s->interlaced_dct;
-                        dct_offset   = s->interlaced_dct ? uvlinesize : uvlinesize * 8;
+                        dct_offset   = s->interlaced_dct ? uvlinesize : uvlinesize*block_size;
 
                         add_dct(s, block[4], 4, dest_cb, dct_linesize);
                         add_dct(s, block[5], 5, dest_cr, dct_linesize);
                         add_dct(s, block[6], 6, dest_cb+dct_offset, dct_linesize);
                         add_dct(s, block[7], 7, dest_cr+dct_offset, dct_linesize);
                         if(!s->chroma_x_shift){//Chroma444
-                            add_dct(s, block[8], 8, dest_cb+8, dct_linesize);
-                            add_dct(s, block[9], 9, dest_cr+8, dct_linesize);
-                            add_dct(s, block[10], 10, dest_cb+8+dct_offset, dct_linesize);
-                            add_dct(s, block[11], 11, dest_cr+8+dct_offset, dct_linesize);
+                            add_dct(s, block[8], 8, dest_cb+block_size, dct_linesize);
+                            add_dct(s, block[9], 9, dest_cr+block_size, dct_linesize);
+                            add_dct(s, block[10], 10, dest_cb+block_size+dct_offset, dct_linesize);
+                            add_dct(s, block[11], 11, dest_cr+block_size+dct_offset, dct_linesize);
                         }
                     }
                 }//fi gray
@@ -2292,14 +2126,37 @@ FF_ENABLE_DEPRECATION_WARNINGS
                 ff_wmv2_add_mb(s, block, dest_y, dest_cb, dest_cr);
             }
         } else {
+            /* Only MPEG-4 Simple Studio Profile is supported in > 8-bit mode.
+               TODO: Integrate 10-bit properly into mpegvideo.c so that ER works properly */
+            if (s->avctx->bits_per_raw_sample > 8){
+                const int act_block_size = block_size * 2;
+                s->idsp.idct_put(dest_y,                           dct_linesize, (int16_t*)(*s->block32)[0]);
+                s->idsp.idct_put(dest_y              + act_block_size, dct_linesize, (int16_t*)(*s->block32)[1]);
+                s->idsp.idct_put(dest_y + dct_offset,              dct_linesize, (int16_t*)(*s->block32)[2]);
+                s->idsp.idct_put(dest_y + dct_offset + act_block_size, dct_linesize, (int16_t*)(*s->block32)[3]);
+
+                dct_linesize = uvlinesize << s->interlaced_dct;
+                dct_offset   = s->interlaced_dct ? uvlinesize : uvlinesize*block_size;
+
+                s->idsp.idct_put(dest_cb,              dct_linesize, (int16_t*)(*s->block32)[4]);
+                s->idsp.idct_put(dest_cr,              dct_linesize, (int16_t*)(*s->block32)[5]);
+                s->idsp.idct_put(dest_cb + dct_offset, dct_linesize, (int16_t*)(*s->block32)[6]);
+                s->idsp.idct_put(dest_cr + dct_offset, dct_linesize, (int16_t*)(*s->block32)[7]);
+                if(!s->chroma_x_shift){//Chroma444
+                    s->idsp.idct_put(dest_cb + act_block_size,              dct_linesize, (int16_t*)(*s->block32)[8]);
+                    s->idsp.idct_put(dest_cr + act_block_size,              dct_linesize, (int16_t*)(*s->block32)[9]);
+                    s->idsp.idct_put(dest_cb + act_block_size + dct_offset, dct_linesize, (int16_t*)(*s->block32)[10]);
+                    s->idsp.idct_put(dest_cr + act_block_size + dct_offset, dct_linesize, (int16_t*)(*s->block32)[11]);
+                }
+            }
             /* dct only in intra block */
-            if(s->encoding || !(s->codec_id==AV_CODEC_ID_MPEG1VIDEO || s->codec_id==AV_CODEC_ID_MPEG2VIDEO)){
+            else if(s->encoding || !(s->codec_id==AV_CODEC_ID_MPEG1VIDEO || s->codec_id==AV_CODEC_ID_MPEG2VIDEO)){
                 put_dct(s, block[0], 0, dest_y                          , dct_linesize, s->qscale);
                 put_dct(s, block[1], 1, dest_y              + block_size, dct_linesize, s->qscale);
                 put_dct(s, block[2], 2, dest_y + dct_offset             , dct_linesize, s->qscale);
                 put_dct(s, block[3], 3, dest_y + dct_offset + block_size, dct_linesize, s->qscale);
 
-                if(!CONFIG_GRAY || !(s->flags&CODEC_FLAG_GRAY)){
+                if (!CONFIG_GRAY || !(s->avctx->flags & AV_CODEC_FLAG_GRAY)) {
                     if(s->chroma_y_shift){
                         put_dct(s, block[4], 4, dest_cb, uvlinesize, s->chroma_qscale);
                         put_dct(s, block[5], 5, dest_cr, uvlinesize, s->chroma_qscale);
@@ -2318,24 +2175,24 @@ FF_ENABLE_DEPRECATION_WARNINGS
                 s->idsp.idct_put(dest_y + dct_offset,              dct_linesize, block[2]);
                 s->idsp.idct_put(dest_y + dct_offset + block_size, dct_linesize, block[3]);
 
-                if(!CONFIG_GRAY || !(s->flags&CODEC_FLAG_GRAY)){
+                if (!CONFIG_GRAY || !(s->avctx->flags & AV_CODEC_FLAG_GRAY)) {
                     if(s->chroma_y_shift){
                         s->idsp.idct_put(dest_cb, uvlinesize, block[4]);
                         s->idsp.idct_put(dest_cr, uvlinesize, block[5]);
                     }else{
 
                         dct_linesize = uvlinesize << s->interlaced_dct;
-                        dct_offset   = s->interlaced_dct ? uvlinesize : uvlinesize * 8;
+                        dct_offset   = s->interlaced_dct ? uvlinesize : uvlinesize*block_size;
 
                         s->idsp.idct_put(dest_cb,              dct_linesize, block[4]);
                         s->idsp.idct_put(dest_cr,              dct_linesize, block[5]);
                         s->idsp.idct_put(dest_cb + dct_offset, dct_linesize, block[6]);
                         s->idsp.idct_put(dest_cr + dct_offset, dct_linesize, block[7]);
                         if(!s->chroma_x_shift){//Chroma444
-                            s->idsp.idct_put(dest_cb + 8,              dct_linesize, block[8]);
-                            s->idsp.idct_put(dest_cr + 8,              dct_linesize, block[9]);
-                            s->idsp.idct_put(dest_cb + 8 + dct_offset, dct_linesize, block[10]);
-                            s->idsp.idct_put(dest_cr + 8 + dct_offset, dct_linesize, block[11]);
+                            s->idsp.idct_put(dest_cb + block_size,              dct_linesize, block[8]);
+                            s->idsp.idct_put(dest_cr + block_size,              dct_linesize, block[9]);
+                            s->idsp.idct_put(dest_cb + block_size + dct_offset, dct_linesize, block[10]);
+                            s->idsp.idct_put(dest_cr + block_size + dct_offset, dct_linesize, block[11]);
                         }
                     }
                 }//gray
@@ -2344,33 +2201,38 @@ FF_ENABLE_DEPRECATION_WARNINGS
 skip_idct:
         if(!readable){
             s->hdsp.put_pixels_tab[0][0](s->dest[0], dest_y ,   linesize,16);
-            s->hdsp.put_pixels_tab[s->chroma_x_shift][0](s->dest[1], dest_cb, uvlinesize,16 >> s->chroma_y_shift);
-            s->hdsp.put_pixels_tab[s->chroma_x_shift][0](s->dest[2], dest_cr, uvlinesize,16 >> s->chroma_y_shift);
+            if (!CONFIG_GRAY || !(s->avctx->flags & AV_CODEC_FLAG_GRAY)) {
+                s->hdsp.put_pixels_tab[s->chroma_x_shift][0](s->dest[1], dest_cb, uvlinesize,16 >> s->chroma_y_shift);
+                s->hdsp.put_pixels_tab[s->chroma_x_shift][0](s->dest[2], dest_cr, uvlinesize,16 >> s->chroma_y_shift);
+            }
         }
     }
 }
 
-void ff_mpv_decode_mb(MpegEncContext *s, int16_t block[12][64])
+void ff_mpv_reconstruct_mb(MpegEncContext *s, int16_t block[12][64])
 {
 #if !CONFIG_SMALL
     if(s->out_format == FMT_MPEG1) {
-        mpv_decode_mb_internal(s, block, 1);
+        if(s->avctx->lowres) mpv_reconstruct_mb_internal(s, block, 1, 1);
+        else                 mpv_reconstruct_mb_internal(s, block, 0, 1);
     } else
 #endif
-        mpv_decode_mb_internal(s, block, 0);
+    if(s->avctx->lowres) mpv_reconstruct_mb_internal(s, block, 1, 0);
+    else                  mpv_reconstruct_mb_internal(s, block, 0, 0);
 }
 
 void ff_mpeg_draw_horiz_band(MpegEncContext *s, int y, int h)
 {
-    ff_draw_horiz_band(s->avctx, s->current_picture.f,
-                       s->last_picture.f, y, h, s->picture_structure,
+    ff_draw_horiz_band(s->avctx, s->current_picture_ptr->f,
+                       s->last_picture_ptr ? s->last_picture_ptr->f : NULL, y, h, s->picture_structure,
                        s->first_field, s->low_delay);
 }
 
 void ff_init_block_index(MpegEncContext *s){ //FIXME maybe rename
     const int linesize   = s->current_picture.f->linesize[0]; //not s->linesize as this would be wrong for field pics
     const int uvlinesize = s->current_picture.f->linesize[1];
-    const int mb_size= 4;
+    const int width_of_mb = (4 + (s->avctx->bits_per_raw_sample > 8)) - s->avctx->lowres;
+    const int height_of_mb = 4 - s->avctx->lowres;
 
     s->block_index[0]= s->b8_stride*(s->mb_y*2    ) - 2 + s->mb_x*2;
     s->block_index[1]= s->b8_stride*(s->mb_y*2    ) - 1 + s->mb_x*2;
@@ -2380,54 +2242,25 @@ void ff_init_block_index(MpegEncContext *s){ //FIXME maybe rename
     s->block_index[5]= s->mb_stride*(s->mb_y + s->mb_height + 2) + s->b8_stride*s->mb_height*2 + s->mb_x - 1;
     //block_index is not used by mpeg2, so it is not affected by chroma_format
 
-    s->dest[0] = s->current_picture.f->data[0] + ((s->mb_x - 1) <<  mb_size);
-    s->dest[1] = s->current_picture.f->data[1] + ((s->mb_x - 1) << (mb_size - s->chroma_x_shift));
-    s->dest[2] = s->current_picture.f->data[2] + ((s->mb_x - 1) << (mb_size - s->chroma_x_shift));
+    s->dest[0] = s->current_picture.f->data[0] + (int)((s->mb_x - 1U) <<  width_of_mb);
+    s->dest[1] = s->current_picture.f->data[1] + (int)((s->mb_x - 1U) << (width_of_mb - s->chroma_x_shift));
+    s->dest[2] = s->current_picture.f->data[2] + (int)((s->mb_x - 1U) << (width_of_mb - s->chroma_x_shift));
 
     if(!(s->pict_type==AV_PICTURE_TYPE_B && s->avctx->draw_horiz_band && s->picture_structure==PICT_FRAME))
     {
         if(s->picture_structure==PICT_FRAME){
-        s->dest[0] += s->mb_y *   linesize << mb_size;
-        s->dest[1] += s->mb_y * uvlinesize << (mb_size - s->chroma_y_shift);
-        s->dest[2] += s->mb_y * uvlinesize << (mb_size - s->chroma_y_shift);
+        s->dest[0] += s->mb_y *   linesize << height_of_mb;
+        s->dest[1] += s->mb_y * uvlinesize << (height_of_mb - s->chroma_y_shift);
+        s->dest[2] += s->mb_y * uvlinesize << (height_of_mb - s->chroma_y_shift);
         }else{
-            s->dest[0] += (s->mb_y>>1) *   linesize << mb_size;
-            s->dest[1] += (s->mb_y>>1) * uvlinesize << (mb_size - s->chroma_y_shift);
-            s->dest[2] += (s->mb_y>>1) * uvlinesize << (mb_size - s->chroma_y_shift);
-            assert((s->mb_y&1) == (s->picture_structure == PICT_BOTTOM_FIELD));
+            s->dest[0] += (s->mb_y>>1) *   linesize << height_of_mb;
+            s->dest[1] += (s->mb_y>>1) * uvlinesize << (height_of_mb - s->chroma_y_shift);
+            s->dest[2] += (s->mb_y>>1) * uvlinesize << (height_of_mb - s->chroma_y_shift);
+            av_assert1((s->mb_y&1) == (s->picture_structure == PICT_BOTTOM_FIELD));
         }
     }
 }
 
-/**
- * Permute an 8x8 block.
- * @param block the block which will be permuted according to the given permutation vector
- * @param permutation the permutation vector
- * @param last the last non zero coefficient in scantable order, used to speed the permutation up
- * @param scantable the used scantable, this is only used to speed the permutation up, the block is not
- *                  (inverse) permutated to scantable order!
- */
-void ff_block_permute(int16_t *block, uint8_t *permutation, const uint8_t *scantable, int last)
-{
-    int i;
-    int16_t temp[64];
-
-    if(last<=0) return;
-    //if(permutation[1]==1) return; //FIXME it is ok but not clean and might fail for some permutations
-
-    for(i=0; i<=last; i++){
-        const int j= scantable[i];
-        temp[j]= block[j];
-        block[j]=0;
-    }
-
-    for(i=0; i<=last; i++){
-        const int j= scantable[i];
-        const int perm_j= permutation[j];
-        block[perm_j]= temp[j];
-    }
-}
-
 void ff_mpeg_flush(AVCodecContext *avctx){
     int i;
     MpegEncContext *s = avctx->priv_data;
@@ -2436,14 +2269,15 @@ void ff_mpeg_flush(AVCodecContext *avctx){
         return;
 
     for (i = 0; i < MAX_PICTURE_COUNT; i++)
-        ff_mpeg_unref_picture(s, &s->picture[i]);
+        ff_mpeg_unref_picture(s->avctx, &s->picture[i]);
     s->current_picture_ptr = s->last_picture_ptr = s->next_picture_ptr = NULL;
 
-    ff_mpeg_unref_picture(s, &s->current_picture);
-    ff_mpeg_unref_picture(s, &s->last_picture);
-    ff_mpeg_unref_picture(s, &s->next_picture);
+    ff_mpeg_unref_picture(s->avctx, &s->current_picture);
+    ff_mpeg_unref_picture(s->avctx, &s->last_picture);
+    ff_mpeg_unref_picture(s->avctx, &s->next_picture);
 
     s->mb_x= s->mb_y= 0;
+    s->closed_gop= 0;
 
     s->parse_context.state= -1;
     s->parse_context.frame_start_found= 0;