Merge commit '8b830ee9a26d47b138f12a82085cdb372f407f1e'
authorHendrik Leppkes <h.leppkes@gmail.com>
Sat, 10 Oct 2015 07:43:47 +0000 (09:43 +0200)
committerHendrik Leppkes <h.leppkes@gmail.com>
Sat, 10 Oct 2015 07:43:47 +0000 (09:43 +0200)
* commit '8b830ee9a26d47b138f12a82085cdb372f407f1e':
  avconv: Do not try to configure filter outputs without streams

Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>
1  2 
ffmpeg_filter.c

diff --cc ffmpeg_filter.c
index 10b2f5f,0000000..9426a88
mode 100644,000000..100644
--- /dev/null
@@@ -1,1067 -1,0 +1,1071 @@@
-     for (cur = outputs, i = 0; cur; cur = cur->next, i++)
-         configure_output_filter(fg, fg->outputs[i], cur);
 +/*
 + * ffmpeg filter configuration
 + *
 + * This file is part of FFmpeg.
 + *
 + * 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.
 + *
 + * 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 FFmpeg; if not, write to the Free Software
 + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 + */
 +
 +#include <stdint.h>
 +
 +#include "ffmpeg.h"
 +
 +#include "libavfilter/avfilter.h"
 +#include "libavfilter/buffersink.h"
 +
 +#include "libavresample/avresample.h"
 +
 +#include "libavutil/avassert.h"
 +#include "libavutil/avstring.h"
 +#include "libavutil/bprint.h"
 +#include "libavutil/channel_layout.h"
 +#include "libavutil/display.h"
 +#include "libavutil/opt.h"
 +#include "libavutil/pixdesc.h"
 +#include "libavutil/pixfmt.h"
 +#include "libavutil/imgutils.h"
 +#include "libavutil/samplefmt.h"
 +
 +enum AVPixelFormat choose_pixel_fmt(AVStream *st, AVCodecContext *enc_ctx, AVCodec *codec, enum AVPixelFormat target)
 +{
 +    if (codec && codec->pix_fmts) {
 +        const enum AVPixelFormat *p = codec->pix_fmts;
 +        const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(target);
 +        int has_alpha = desc ? desc->nb_components % 2 == 0 : 0;
 +        enum AVPixelFormat best= AV_PIX_FMT_NONE;
 +        static const enum AVPixelFormat mjpeg_formats[] =
 +            { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
 +        static const enum AVPixelFormat ljpeg_formats[] =
 +            { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
 +              AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
 +
 +        if (enc_ctx->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
 +            if (enc_ctx->codec_id == AV_CODEC_ID_MJPEG) {
 +                p = mjpeg_formats;
 +            } else if (enc_ctx->codec_id == AV_CODEC_ID_LJPEG) {
 +                p =ljpeg_formats;
 +            }
 +        }
 +        for (; *p != AV_PIX_FMT_NONE; p++) {
 +            best= avcodec_find_best_pix_fmt_of_2(best, *p, target, has_alpha, NULL);
 +            if (*p == target)
 +                break;
 +        }
 +        if (*p == AV_PIX_FMT_NONE) {
 +            if (target != AV_PIX_FMT_NONE)
 +                av_log(NULL, AV_LOG_WARNING,
 +                       "Incompatible pixel format '%s' for codec '%s', auto-selecting format '%s'\n",
 +                       av_get_pix_fmt_name(target),
 +                       codec->name,
 +                       av_get_pix_fmt_name(best));
 +            return best;
 +        }
 +    }
 +    return target;
 +}
 +
 +void choose_sample_fmt(AVStream *st, AVCodec *codec)
 +{
 +    if (codec && codec->sample_fmts) {
 +        const enum AVSampleFormat *p = codec->sample_fmts;
 +        for (; *p != -1; p++) {
 +            if (*p == st->codec->sample_fmt)
 +                break;
 +        }
 +        if (*p == -1) {
 +            if((codec->capabilities & AV_CODEC_CAP_LOSSLESS) && av_get_sample_fmt_name(st->codec->sample_fmt) > av_get_sample_fmt_name(codec->sample_fmts[0]))
 +                av_log(NULL, AV_LOG_ERROR, "Conversion will not be lossless.\n");
 +            if(av_get_sample_fmt_name(st->codec->sample_fmt))
 +            av_log(NULL, AV_LOG_WARNING,
 +                   "Incompatible sample format '%s' for codec '%s', auto-selecting format '%s'\n",
 +                   av_get_sample_fmt_name(st->codec->sample_fmt),
 +                   codec->name,
 +                   av_get_sample_fmt_name(codec->sample_fmts[0]));
 +            st->codec->sample_fmt = codec->sample_fmts[0];
 +        }
 +    }
 +}
 +
 +static char *choose_pix_fmts(OutputStream *ost)
 +{
 +    AVDictionaryEntry *strict_dict = av_dict_get(ost->encoder_opts, "strict", NULL, 0);
 +    if (strict_dict)
 +        // used by choose_pixel_fmt() and below
 +        av_opt_set(ost->enc_ctx, "strict", strict_dict->value, 0);
 +
 +     if (ost->keep_pix_fmt) {
 +        if (ost->filter)
 +            avfilter_graph_set_auto_convert(ost->filter->graph->graph,
 +                                            AVFILTER_AUTO_CONVERT_NONE);
 +        if (ost->enc_ctx->pix_fmt == AV_PIX_FMT_NONE)
 +            return NULL;
 +        return av_strdup(av_get_pix_fmt_name(ost->enc_ctx->pix_fmt));
 +    }
 +    if (ost->enc_ctx->pix_fmt != AV_PIX_FMT_NONE) {
 +        return av_strdup(av_get_pix_fmt_name(choose_pixel_fmt(ost->st, ost->enc_ctx, ost->enc, ost->enc_ctx->pix_fmt)));
 +    } else if (ost->enc && ost->enc->pix_fmts) {
 +        const enum AVPixelFormat *p;
 +        AVIOContext *s = NULL;
 +        uint8_t *ret;
 +        int len;
 +
 +        if (avio_open_dyn_buf(&s) < 0)
 +            exit_program(1);
 +
 +        p = ost->enc->pix_fmts;
 +        if (ost->enc_ctx->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
 +            if (ost->enc_ctx->codec_id == AV_CODEC_ID_MJPEG) {
 +                p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
 +            } else if (ost->enc_ctx->codec_id == AV_CODEC_ID_LJPEG) {
 +                p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
 +                                                    AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
 +            }
 +        }
 +
 +        for (; *p != AV_PIX_FMT_NONE; p++) {
 +            const char *name = av_get_pix_fmt_name(*p);
 +            avio_printf(s, "%s|", name);
 +        }
 +        len = avio_close_dyn_buf(s, &ret);
 +        ret[len - 1] = 0;
 +        return ret;
 +    } else
 +        return NULL;
 +}
 +
 +/* Define a function for building a string containing a list of
 + * allowed formats. */
 +#define DEF_CHOOSE_FORMAT(type, var, supported_list, none, get_name)           \
 +static char *choose_ ## var ## s(OutputStream *ost)                            \
 +{                                                                              \
 +    if (ost->enc_ctx->var != none) {                                           \
 +        get_name(ost->enc_ctx->var);                                           \
 +        return av_strdup(name);                                                \
 +    } else if (ost->enc && ost->enc->supported_list) {                         \
 +        const type *p;                                                         \
 +        AVIOContext *s = NULL;                                                 \
 +        uint8_t *ret;                                                          \
 +        int len;                                                               \
 +                                                                               \
 +        if (avio_open_dyn_buf(&s) < 0)                                         \
 +            exit_program(1);                                                           \
 +                                                                               \
 +        for (p = ost->enc->supported_list; *p != none; p++) {                  \
 +            get_name(*p);                                                      \
 +            avio_printf(s, "%s|", name);                                       \
 +        }                                                                      \
 +        len = avio_close_dyn_buf(s, &ret);                                     \
 +        ret[len - 1] = 0;                                                      \
 +        return ret;                                                            \
 +    } else                                                                     \
 +        return NULL;                                                           \
 +}
 +
 +// DEF_CHOOSE_FORMAT(enum AVPixelFormat, pix_fmt, pix_fmts, AV_PIX_FMT_NONE,
 +//                   GET_PIX_FMT_NAME)
 +
 +DEF_CHOOSE_FORMAT(enum AVSampleFormat, sample_fmt, sample_fmts,
 +                  AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME)
 +
 +DEF_CHOOSE_FORMAT(int, sample_rate, supported_samplerates, 0,
 +                  GET_SAMPLE_RATE_NAME)
 +
 +DEF_CHOOSE_FORMAT(uint64_t, channel_layout, channel_layouts, 0,
 +                  GET_CH_LAYOUT_NAME)
 +
 +FilterGraph *init_simple_filtergraph(InputStream *ist, OutputStream *ost)
 +{
 +    FilterGraph *fg = av_mallocz(sizeof(*fg));
 +
 +    if (!fg)
 +        exit_program(1);
 +    fg->index = nb_filtergraphs;
 +
 +    GROW_ARRAY(fg->outputs, fg->nb_outputs);
 +    if (!(fg->outputs[0] = av_mallocz(sizeof(*fg->outputs[0]))))
 +        exit_program(1);
 +    fg->outputs[0]->ost   = ost;
 +    fg->outputs[0]->graph = fg;
 +
 +    ost->filter = fg->outputs[0];
 +
 +    GROW_ARRAY(fg->inputs, fg->nb_inputs);
 +    if (!(fg->inputs[0] = av_mallocz(sizeof(*fg->inputs[0]))))
 +        exit_program(1);
 +    fg->inputs[0]->ist   = ist;
 +    fg->inputs[0]->graph = fg;
 +
 +    GROW_ARRAY(ist->filters, ist->nb_filters);
 +    ist->filters[ist->nb_filters - 1] = fg->inputs[0];
 +
 +    GROW_ARRAY(filtergraphs, nb_filtergraphs);
 +    filtergraphs[nb_filtergraphs - 1] = fg;
 +
 +    return fg;
 +}
 +
 +static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
 +{
 +    InputStream *ist = NULL;
 +    enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
 +    int i;
 +
 +    // TODO: support other filter types
 +    if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
 +        av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
 +               "currently.\n");
 +        exit_program(1);
 +    }
 +
 +    if (in->name) {
 +        AVFormatContext *s;
 +        AVStream       *st = NULL;
 +        char *p;
 +        int file_idx = strtol(in->name, &p, 0);
 +
 +        if (file_idx < 0 || file_idx >= nb_input_files) {
 +            av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtergraph description %s.\n",
 +                   file_idx, fg->graph_desc);
 +            exit_program(1);
 +        }
 +        s = input_files[file_idx]->ctx;
 +
 +        for (i = 0; i < s->nb_streams; i++) {
 +            enum AVMediaType stream_type = s->streams[i]->codec->codec_type;
 +            if (stream_type != type &&
 +                !(stream_type == AVMEDIA_TYPE_SUBTITLE &&
 +                  type == AVMEDIA_TYPE_VIDEO /* sub2video hack */))
 +                continue;
 +            if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
 +                st = s->streams[i];
 +                break;
 +            }
 +        }
 +        if (!st) {
 +            av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
 +                   "matches no streams.\n", p, fg->graph_desc);
 +            exit_program(1);
 +        }
 +        ist = input_streams[input_files[file_idx]->ist_index + st->index];
 +    } else {
 +        /* find the first unused stream of corresponding type */
 +        for (i = 0; i < nb_input_streams; i++) {
 +            ist = input_streams[i];
 +            if (ist->dec_ctx->codec_type == type && ist->discard)
 +                break;
 +        }
 +        if (i == nb_input_streams) {
 +            av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
 +                   "unlabeled input pad %d on filter %s\n", in->pad_idx,
 +                   in->filter_ctx->name);
 +            exit_program(1);
 +        }
 +    }
 +    av_assert0(ist);
 +
 +    ist->discard         = 0;
 +    ist->decoding_needed |= DECODING_FOR_FILTER;
 +    ist->st->discard = AVDISCARD_NONE;
 +
 +    GROW_ARRAY(fg->inputs, fg->nb_inputs);
 +    if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
 +        exit_program(1);
 +    fg->inputs[fg->nb_inputs - 1]->ist   = ist;
 +    fg->inputs[fg->nb_inputs - 1]->graph = fg;
 +
 +    GROW_ARRAY(ist->filters, ist->nb_filters);
 +    ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
 +}
 +
 +int init_complex_filtergraph(FilterGraph *fg)
 +{
 +    AVFilterInOut *inputs, *outputs, *cur;
 +    AVFilterGraph *graph;
 +    int ret = 0;
 +
 +    /* this graph is only used for determining the kinds of inputs
 +     * and outputs we have, and is discarded on exit from this function */
 +    graph = avfilter_graph_alloc();
 +    if (!graph)
 +        return AVERROR(ENOMEM);
 +
 +    ret = avfilter_graph_parse2(graph, fg->graph_desc, &inputs, &outputs);
 +    if (ret < 0)
 +        goto fail;
 +
 +    for (cur = inputs; cur; cur = cur->next)
 +        init_input_filter(fg, cur);
 +
 +    for (cur = outputs; cur;) {
 +        GROW_ARRAY(fg->outputs, fg->nb_outputs);
 +        fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]));
 +        if (!fg->outputs[fg->nb_outputs - 1])
 +            exit_program(1);
 +
 +        fg->outputs[fg->nb_outputs - 1]->graph   = fg;
 +        fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
 +        fg->outputs[fg->nb_outputs - 1]->type    = avfilter_pad_get_type(cur->filter_ctx->output_pads,
 +                                                                         cur->pad_idx);
 +        cur = cur->next;
 +        fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
 +    }
 +
 +fail:
 +    avfilter_inout_free(&inputs);
 +    avfilter_graph_free(&graph);
 +    return ret;
 +}
 +
 +static int insert_trim(int64_t start_time, int64_t duration,
 +                       AVFilterContext **last_filter, int *pad_idx,
 +                       const char *filter_name)
 +{
 +    AVFilterGraph *graph = (*last_filter)->graph;
 +    AVFilterContext *ctx;
 +    const AVFilter *trim;
 +    enum AVMediaType type = avfilter_pad_get_type((*last_filter)->output_pads, *pad_idx);
 +    const char *name = (type == AVMEDIA_TYPE_VIDEO) ? "trim" : "atrim";
 +    int ret = 0;
 +
 +    if (duration == INT64_MAX && start_time == AV_NOPTS_VALUE)
 +        return 0;
 +
 +    trim = avfilter_get_by_name(name);
 +    if (!trim) {
 +        av_log(NULL, AV_LOG_ERROR, "%s filter not present, cannot limit "
 +               "recording time.\n", name);
 +        return AVERROR_FILTER_NOT_FOUND;
 +    }
 +
 +    ctx = avfilter_graph_alloc_filter(graph, trim, filter_name);
 +    if (!ctx)
 +        return AVERROR(ENOMEM);
 +
 +    if (duration != INT64_MAX) {
 +        ret = av_opt_set_int(ctx, "durationi", duration,
 +                                AV_OPT_SEARCH_CHILDREN);
 +    }
 +    if (ret >= 0 && start_time != AV_NOPTS_VALUE) {
 +        ret = av_opt_set_int(ctx, "starti", start_time,
 +                                AV_OPT_SEARCH_CHILDREN);
 +    }
 +    if (ret < 0) {
 +        av_log(ctx, AV_LOG_ERROR, "Error configuring the %s filter", name);
 +        return ret;
 +    }
 +
 +    ret = avfilter_init_str(ctx, NULL);
 +    if (ret < 0)
 +        return ret;
 +
 +    ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
 +    if (ret < 0)
 +        return ret;
 +
 +    *last_filter = ctx;
 +    *pad_idx     = 0;
 +    return 0;
 +}
 +
 +static int insert_filter(AVFilterContext **last_filter, int *pad_idx,
 +                         const char *filter_name, const char *args)
 +{
 +    AVFilterGraph *graph = (*last_filter)->graph;
 +    AVFilterContext *ctx;
 +    int ret;
 +
 +    ret = avfilter_graph_create_filter(&ctx,
 +                                       avfilter_get_by_name(filter_name),
 +                                       filter_name, args, NULL, graph);
 +    if (ret < 0)
 +        return ret;
 +
 +    ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
 +    if (ret < 0)
 +        return ret;
 +
 +    *last_filter = ctx;
 +    *pad_idx     = 0;
 +    return 0;
 +}
 +
 +static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 +{
 +    char *pix_fmts;
 +    OutputStream *ost = ofilter->ost;
 +    OutputFile    *of = output_files[ost->file_index];
 +    AVCodecContext *codec = ost->enc_ctx;
 +    AVFilterContext *last_filter = out->filter_ctx;
 +    int pad_idx = out->pad_idx;
 +    int ret;
 +    char name[255];
 +
 +    snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
 +    ret = avfilter_graph_create_filter(&ofilter->filter,
 +                                       avfilter_get_by_name("buffersink"),
 +                                       name, NULL, NULL, fg->graph);
 +
 +    if (ret < 0)
 +        return ret;
 +
 +    if (codec->width || codec->height) {
 +        char args[255];
 +        AVFilterContext *filter;
 +        AVDictionaryEntry *e = NULL;
 +
 +        snprintf(args, sizeof(args), "%d:%d",
 +                 codec->width,
 +                 codec->height);
 +
 +        while ((e = av_dict_get(ost->sws_dict, "", e,
 +                                AV_DICT_IGNORE_SUFFIX))) {
 +            av_strlcatf(args, sizeof(args), ":%s=%s", e->key, e->value);
 +        }
 +
 +        snprintf(name, sizeof(name), "scaler for output stream %d:%d",
 +                 ost->file_index, ost->index);
 +        if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
 +                                                name, args, NULL, fg->graph)) < 0)
 +            return ret;
 +        if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
 +            return ret;
 +
 +        last_filter = filter;
 +        pad_idx = 0;
 +    }
 +
 +    if ((pix_fmts = choose_pix_fmts(ost))) {
 +        AVFilterContext *filter;
 +        snprintf(name, sizeof(name), "pixel format for output stream %d:%d",
 +                 ost->file_index, ost->index);
 +        ret = avfilter_graph_create_filter(&filter,
 +                                           avfilter_get_by_name("format"),
 +                                           "format", pix_fmts, NULL, fg->graph);
 +        av_freep(&pix_fmts);
 +        if (ret < 0)
 +            return ret;
 +        if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
 +            return ret;
 +
 +        last_filter = filter;
 +        pad_idx     = 0;
 +    }
 +
 +    if (ost->frame_rate.num && 0) {
 +        AVFilterContext *fps;
 +        char args[255];
 +
 +        snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
 +                 ost->frame_rate.den);
 +        snprintf(name, sizeof(name), "fps for output stream %d:%d",
 +                 ost->file_index, ost->index);
 +        ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
 +                                           name, args, NULL, fg->graph);
 +        if (ret < 0)
 +            return ret;
 +
 +        ret = avfilter_link(last_filter, pad_idx, fps, 0);
 +        if (ret < 0)
 +            return ret;
 +        last_filter = fps;
 +        pad_idx = 0;
 +    }
 +
 +    snprintf(name, sizeof(name), "trim for output stream %d:%d",
 +             ost->file_index, ost->index);
 +    ret = insert_trim(of->start_time, of->recording_time,
 +                      &last_filter, &pad_idx, name);
 +    if (ret < 0)
 +        return ret;
 +
 +
 +    if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 +        return ret;
 +
 +    return 0;
 +}
 +
 +static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 +{
 +    OutputStream *ost = ofilter->ost;
 +    OutputFile    *of = output_files[ost->file_index];
 +    AVCodecContext *codec  = ost->enc_ctx;
 +    AVFilterContext *last_filter = out->filter_ctx;
 +    int pad_idx = out->pad_idx;
 +    char *sample_fmts, *sample_rates, *channel_layouts;
 +    char name[255];
 +    int ret;
 +
 +    snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
 +    ret = avfilter_graph_create_filter(&ofilter->filter,
 +                                       avfilter_get_by_name("abuffersink"),
 +                                       name, NULL, NULL, fg->graph);
 +    if (ret < 0)
 +        return ret;
 +    if ((ret = av_opt_set_int(ofilter->filter, "all_channel_counts", 1, AV_OPT_SEARCH_CHILDREN)) < 0)
 +        return ret;
 +
 +#define AUTO_INSERT_FILTER(opt_name, filter_name, arg) do {                 \
 +    AVFilterContext *filt_ctx;                                              \
 +                                                                            \
 +    av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
 +           "similarly to -af " filter_name "=%s.\n", arg);                  \
 +                                                                            \
 +    ret = avfilter_graph_create_filter(&filt_ctx,                           \
 +                                       avfilter_get_by_name(filter_name),   \
 +                                       filter_name, arg, NULL, fg->graph);  \
 +    if (ret < 0)                                                            \
 +        return ret;                                                         \
 +                                                                            \
 +    ret = avfilter_link(last_filter, pad_idx, filt_ctx, 0);                 \
 +    if (ret < 0)                                                            \
 +        return ret;                                                         \
 +                                                                            \
 +    last_filter = filt_ctx;                                                 \
 +    pad_idx = 0;                                                            \
 +} while (0)
 +    if (ost->audio_channels_mapped) {
 +        int i;
 +        AVBPrint pan_buf;
 +        av_bprint_init(&pan_buf, 256, 8192);
 +        av_bprintf(&pan_buf, "0x%"PRIx64,
 +                   av_get_default_channel_layout(ost->audio_channels_mapped));
 +        for (i = 0; i < ost->audio_channels_mapped; i++)
 +            if (ost->audio_channels_map[i] != -1)
 +                av_bprintf(&pan_buf, "|c%d=c%d", i, ost->audio_channels_map[i]);
 +
 +        AUTO_INSERT_FILTER("-map_channel", "pan", pan_buf.str);
 +        av_bprint_finalize(&pan_buf, NULL);
 +    }
 +
 +    if (codec->channels && !codec->channel_layout)
 +        codec->channel_layout = av_get_default_channel_layout(codec->channels);
 +
 +    sample_fmts     = choose_sample_fmts(ost);
 +    sample_rates    = choose_sample_rates(ost);
 +    channel_layouts = choose_channel_layouts(ost);
 +    if (sample_fmts || sample_rates || channel_layouts) {
 +        AVFilterContext *format;
 +        char args[256];
 +        args[0] = 0;
 +
 +        if (sample_fmts)
 +            av_strlcatf(args, sizeof(args), "sample_fmts=%s:",
 +                            sample_fmts);
 +        if (sample_rates)
 +            av_strlcatf(args, sizeof(args), "sample_rates=%s:",
 +                            sample_rates);
 +        if (channel_layouts)
 +            av_strlcatf(args, sizeof(args), "channel_layouts=%s:",
 +                            channel_layouts);
 +
 +        av_freep(&sample_fmts);
 +        av_freep(&sample_rates);
 +        av_freep(&channel_layouts);
 +
 +        snprintf(name, sizeof(name), "audio format for output stream %d:%d",
 +                 ost->file_index, ost->index);
 +        ret = avfilter_graph_create_filter(&format,
 +                                           avfilter_get_by_name("aformat"),
 +                                           name, args, NULL, fg->graph);
 +        if (ret < 0)
 +            return ret;
 +
 +        ret = avfilter_link(last_filter, pad_idx, format, 0);
 +        if (ret < 0)
 +            return ret;
 +
 +        last_filter = format;
 +        pad_idx = 0;
 +    }
 +
 +    if (audio_volume != 256 && 0) {
 +        char args[256];
 +
 +        snprintf(args, sizeof(args), "%f", audio_volume / 256.);
 +        AUTO_INSERT_FILTER("-vol", "volume", args);
 +    }
 +
 +    if (ost->apad && of->shortest) {
 +        char args[256];
 +        int i;
 +
 +        for (i=0; i<of->ctx->nb_streams; i++)
 +            if (of->ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
 +                break;
 +
 +        if (i<of->ctx->nb_streams) {
 +            snprintf(args, sizeof(args), "%s", ost->apad);
 +            AUTO_INSERT_FILTER("-apad", "apad", args);
 +        }
 +    }
 +
 +    snprintf(name, sizeof(name), "trim for output stream %d:%d",
 +             ost->file_index, ost->index);
 +    ret = insert_trim(of->start_time, of->recording_time,
 +                      &last_filter, &pad_idx, name);
 +    if (ret < 0)
 +        return ret;
 +
 +    if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 +        return ret;
 +
 +    return 0;
 +}
 +
 +#define DESCRIBE_FILTER_LINK(f, inout, in)                         \
 +{                                                                  \
 +    AVFilterContext *ctx = inout->filter_ctx;                      \
 +    AVFilterPad *pads = in ? ctx->input_pads  : ctx->output_pads;  \
 +    int       nb_pads = in ? ctx->nb_inputs   : ctx->nb_outputs;   \
 +    AVIOContext *pb;                                               \
 +                                                                   \
 +    if (avio_open_dyn_buf(&pb) < 0)                                \
 +        exit_program(1);                                           \
 +                                                                   \
 +    avio_printf(pb, "%s", ctx->filter->name);                      \
 +    if (nb_pads > 1)                                               \
 +        avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
 +    avio_w8(pb, 0);                                                \
 +    avio_close_dyn_buf(pb, &f->name);                              \
 +}
 +
 +int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 +{
 +    av_freep(&ofilter->name);
 +    DESCRIBE_FILTER_LINK(ofilter, out, 0);
 +
 +    if (!ofilter->ost) {
 +        av_log(NULL, AV_LOG_FATAL, "Filter %s has a unconnected output\n", ofilter->name);
 +        exit_program(1);
 +    }
 +
 +    switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
 +    case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
 +    case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
 +    default: av_assert0(0);
 +    }
 +}
 +
 +static int sub2video_prepare(InputStream *ist)
 +{
 +    AVFormatContext *avf = input_files[ist->file_index]->ctx;
 +    int i, w, h;
 +
 +    /* Compute the size of the canvas for the subtitles stream.
 +       If the subtitles codec has set a size, use it. Otherwise use the
 +       maximum dimensions of the video streams in the same file. */
 +    w = ist->dec_ctx->width;
 +    h = ist->dec_ctx->height;
 +    if (!(w && h)) {
 +        for (i = 0; i < avf->nb_streams; i++) {
 +            if (avf->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
 +                w = FFMAX(w, avf->streams[i]->codec->width);
 +                h = FFMAX(h, avf->streams[i]->codec->height);
 +            }
 +        }
 +        if (!(w && h)) {
 +            w = FFMAX(w, 720);
 +            h = FFMAX(h, 576);
 +        }
 +        av_log(avf, AV_LOG_INFO, "sub2video: using %dx%d canvas\n", w, h);
 +    }
 +    ist->sub2video.w = ist->resample_width  = w;
 +    ist->sub2video.h = ist->resample_height = h;
 +
 +    /* rectangles are AV_PIX_FMT_PAL8, but we have no guarantee that the
 +       palettes for all rectangles are identical or compatible */
 +    ist->resample_pix_fmt = ist->dec_ctx->pix_fmt = AV_PIX_FMT_RGB32;
 +
 +    ist->sub2video.frame = av_frame_alloc();
 +    if (!ist->sub2video.frame)
 +        return AVERROR(ENOMEM);
 +    ist->sub2video.last_pts = INT64_MIN;
 +    return 0;
 +}
 +
 +static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
 +                                        AVFilterInOut *in)
 +{
 +    AVFilterContext *last_filter;
 +    const AVFilter *buffer_filt = avfilter_get_by_name("buffer");
 +    InputStream *ist = ifilter->ist;
 +    InputFile     *f = input_files[ist->file_index];
 +    AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
 +                                         ist->st->time_base;
 +    AVRational fr = ist->framerate;
 +    AVRational sar;
 +    AVBPrint args;
 +    char name[255];
 +    int ret, pad_idx = 0;
 +    int64_t tsoffset = 0;
 +
 +    if (ist->dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {
 +        av_log(NULL, AV_LOG_ERROR, "Cannot connect video filter to audio input\n");
 +        return AVERROR(EINVAL);
 +    }
 +
 +    if (!fr.num)
 +        fr = av_guess_frame_rate(input_files[ist->file_index]->ctx, ist->st, NULL);
 +
 +    if (ist->dec_ctx->codec_type == AVMEDIA_TYPE_SUBTITLE) {
 +        ret = sub2video_prepare(ist);
 +        if (ret < 0)
 +            return ret;
 +    }
 +
 +    sar = ist->st->sample_aspect_ratio.num ?
 +          ist->st->sample_aspect_ratio :
 +          ist->dec_ctx->sample_aspect_ratio;
 +    if(!sar.den)
 +        sar = (AVRational){0,1};
 +    av_bprint_init(&args, 0, 1);
 +    av_bprintf(&args,
 +             "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:"
 +             "pixel_aspect=%d/%d:sws_param=flags=%d", ist->resample_width,
 +             ist->resample_height,
 +             ist->hwaccel_retrieve_data ? ist->hwaccel_retrieved_pix_fmt : ist->resample_pix_fmt,
 +             tb.num, tb.den, sar.num, sar.den,
 +             SWS_BILINEAR + ((ist->dec_ctx->flags&AV_CODEC_FLAG_BITEXACT) ? SWS_BITEXACT:0));
 +    if (fr.num && fr.den)
 +        av_bprintf(&args, ":frame_rate=%d/%d", fr.num, fr.den);
 +    snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 +             ist->file_index, ist->st->index);
 +
 +    if ((ret = avfilter_graph_create_filter(&ifilter->filter, buffer_filt, name,
 +                                            args.str, NULL, fg->graph)) < 0)
 +        return ret;
 +    last_filter = ifilter->filter;
 +
 +    if (ist->autorotate) {
 +        double theta = get_rotation(ist->st);
 +
 +        if (fabs(theta - 90) < 1.0) {
 +            ret = insert_filter(&last_filter, &pad_idx, "transpose", "clock");
 +        } else if (fabs(theta - 180) < 1.0) {
 +            ret = insert_filter(&last_filter, &pad_idx, "hflip", NULL);
 +            if (ret < 0)
 +                return ret;
 +            ret = insert_filter(&last_filter, &pad_idx, "vflip", NULL);
 +        } else if (fabs(theta - 270) < 1.0) {
 +            ret = insert_filter(&last_filter, &pad_idx, "transpose", "cclock");
 +        } else if (fabs(theta) > 1.0) {
 +            char rotate_buf[64];
 +            snprintf(rotate_buf, sizeof(rotate_buf), "%f*PI/180", theta);
 +            ret = insert_filter(&last_filter, &pad_idx, "rotate", rotate_buf);
 +        }
 +        if (ret < 0)
 +            return ret;
 +    }
 +
 +    if (ist->framerate.num) {
 +        AVFilterContext *setpts;
 +
 +        snprintf(name, sizeof(name), "force CFR for input from stream %d:%d",
 +                 ist->file_index, ist->st->index);
 +        if ((ret = avfilter_graph_create_filter(&setpts,
 +                                                avfilter_get_by_name("setpts"),
 +                                                name, "N", NULL,
 +                                                fg->graph)) < 0)
 +            return ret;
 +
 +        if ((ret = avfilter_link(last_filter, 0, setpts, 0)) < 0)
 +            return ret;
 +
 +        last_filter = setpts;
 +    }
 +
 +    if (do_deinterlace) {
 +        AVFilterContext *yadif;
 +
 +        snprintf(name, sizeof(name), "deinterlace input from stream %d:%d",
 +                 ist->file_index, ist->st->index);
 +        if ((ret = avfilter_graph_create_filter(&yadif,
 +                                                avfilter_get_by_name("yadif"),
 +                                                name, "", NULL,
 +                                                fg->graph)) < 0)
 +            return ret;
 +
 +        if ((ret = avfilter_link(last_filter, 0, yadif, 0)) < 0)
 +            return ret;
 +
 +        last_filter = yadif;
 +    }
 +
 +    snprintf(name, sizeof(name), "trim for input stream %d:%d",
 +             ist->file_index, ist->st->index);
 +    if (copy_ts) {
 +        tsoffset = f->start_time == AV_NOPTS_VALUE ? 0 : f->start_time;
 +        if (!start_at_zero && f->ctx->start_time != AV_NOPTS_VALUE)
 +            tsoffset += f->ctx->start_time;
 +    }
 +    ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
 +                      AV_NOPTS_VALUE : tsoffset, f->recording_time,
 +                      &last_filter, &pad_idx, name);
 +    if (ret < 0)
 +        return ret;
 +
 +    if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
 +        return ret;
 +    return 0;
 +}
 +
 +static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
 +                                        AVFilterInOut *in)
 +{
 +    AVFilterContext *last_filter;
 +    const AVFilter *abuffer_filt = avfilter_get_by_name("abuffer");
 +    InputStream *ist = ifilter->ist;
 +    InputFile     *f = input_files[ist->file_index];
 +    AVBPrint args;
 +    char name[255];
 +    int ret, pad_idx = 0;
 +    int64_t tsoffset = 0;
 +
 +    if (ist->dec_ctx->codec_type != AVMEDIA_TYPE_AUDIO) {
 +        av_log(NULL, AV_LOG_ERROR, "Cannot connect audio filter to non audio input\n");
 +        return AVERROR(EINVAL);
 +    }
 +
 +    av_bprint_init(&args, 0, AV_BPRINT_SIZE_AUTOMATIC);
 +    av_bprintf(&args, "time_base=%d/%d:sample_rate=%d:sample_fmt=%s",
 +             1, ist->dec_ctx->sample_rate,
 +             ist->dec_ctx->sample_rate,
 +             av_get_sample_fmt_name(ist->dec_ctx->sample_fmt));
 +    if (ist->dec_ctx->channel_layout)
 +        av_bprintf(&args, ":channel_layout=0x%"PRIx64,
 +                   ist->dec_ctx->channel_layout);
 +    else
 +        av_bprintf(&args, ":channels=%d", ist->dec_ctx->channels);
 +    snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 +             ist->file_index, ist->st->index);
 +
 +    if ((ret = avfilter_graph_create_filter(&ifilter->filter, abuffer_filt,
 +                                            name, args.str, NULL,
 +                                            fg->graph)) < 0)
 +        return ret;
 +    last_filter = ifilter->filter;
 +
 +#define AUTO_INSERT_FILTER_INPUT(opt_name, filter_name, arg) do {                 \
 +    AVFilterContext *filt_ctx;                                              \
 +                                                                            \
 +    av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
 +           "similarly to -af " filter_name "=%s.\n", arg);                  \
 +                                                                            \
 +    snprintf(name, sizeof(name), "graph %d %s for input stream %d:%d",      \
 +                fg->index, filter_name, ist->file_index, ist->st->index);   \
 +    ret = avfilter_graph_create_filter(&filt_ctx,                           \
 +                                       avfilter_get_by_name(filter_name),   \
 +                                       name, arg, NULL, fg->graph);         \
 +    if (ret < 0)                                                            \
 +        return ret;                                                         \
 +                                                                            \
 +    ret = avfilter_link(last_filter, 0, filt_ctx, 0);                       \
 +    if (ret < 0)                                                            \
 +        return ret;                                                         \
 +                                                                            \
 +    last_filter = filt_ctx;                                                 \
 +} while (0)
 +
 +    if (audio_sync_method > 0) {
 +        char args[256] = {0};
 +
 +        av_strlcatf(args, sizeof(args), "async=%d", audio_sync_method);
 +        if (audio_drift_threshold != 0.1)
 +            av_strlcatf(args, sizeof(args), ":min_hard_comp=%f", audio_drift_threshold);
 +        if (!fg->reconfiguration)
 +            av_strlcatf(args, sizeof(args), ":first_pts=0");
 +        AUTO_INSERT_FILTER_INPUT("-async", "aresample", args);
 +    }
 +
 +//     if (ost->audio_channels_mapped) {
 +//         int i;
 +//         AVBPrint pan_buf;
 +//         av_bprint_init(&pan_buf, 256, 8192);
 +//         av_bprintf(&pan_buf, "0x%"PRIx64,
 +//                    av_get_default_channel_layout(ost->audio_channels_mapped));
 +//         for (i = 0; i < ost->audio_channels_mapped; i++)
 +//             if (ost->audio_channels_map[i] != -1)
 +//                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
 +//         AUTO_INSERT_FILTER_INPUT("-map_channel", "pan", pan_buf.str);
 +//         av_bprint_finalize(&pan_buf, NULL);
 +//     }
 +
 +    if (audio_volume != 256) {
 +        char args[256];
 +
 +        av_log(NULL, AV_LOG_WARNING, "-vol has been deprecated. Use the volume "
 +               "audio filter instead.\n");
 +
 +        snprintf(args, sizeof(args), "%f", audio_volume / 256.);
 +        AUTO_INSERT_FILTER_INPUT("-vol", "volume", args);
 +    }
 +
 +    snprintf(name, sizeof(name), "trim for input stream %d:%d",
 +             ist->file_index, ist->st->index);
 +    if (copy_ts) {
 +        tsoffset = f->start_time == AV_NOPTS_VALUE ? 0 : f->start_time;
 +        if (!start_at_zero && f->ctx->start_time != AV_NOPTS_VALUE)
 +            tsoffset += f->ctx->start_time;
 +    }
 +    ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
 +                      AV_NOPTS_VALUE : tsoffset, f->recording_time,
 +                      &last_filter, &pad_idx, name);
 +    if (ret < 0)
 +        return ret;
 +
 +    if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
 +        return ret;
 +
 +    return 0;
 +}
 +
 +static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
 +                                  AVFilterInOut *in)
 +{
 +    av_freep(&ifilter->name);
 +    DESCRIBE_FILTER_LINK(ifilter, in, 1);
 +
 +    if (!ifilter->ist->dec) {
 +        av_log(NULL, AV_LOG_ERROR,
 +               "No decoder for stream #%d:%d, filtering impossible\n",
 +               ifilter->ist->file_index, ifilter->ist->st->index);
 +        return AVERROR_DECODER_NOT_FOUND;
 +    }
 +    switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
 +    case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
 +    case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
 +    default: av_assert0(0);
 +    }
 +}
 +
 +int configure_filtergraph(FilterGraph *fg)
 +{
 +    AVFilterInOut *inputs, *outputs, *cur;
 +    int ret, i, simple = !fg->graph_desc;
 +    const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
 +                                      fg->graph_desc;
 +
 +    avfilter_graph_free(&fg->graph);
 +    if (!(fg->graph = avfilter_graph_alloc()))
 +        return AVERROR(ENOMEM);
 +
 +    if (simple) {
 +        OutputStream *ost = fg->outputs[0]->ost;
 +        char args[512];
 +        AVDictionaryEntry *e = NULL;
 +
 +        args[0] = 0;
 +        while ((e = av_dict_get(ost->sws_dict, "", e,
 +                                AV_DICT_IGNORE_SUFFIX))) {
 +            av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
 +        }
 +        if (strlen(args))
 +            args[strlen(args)-1] = 0;
 +        fg->graph->scale_sws_opts = av_strdup(args);
 +
 +        args[0] = 0;
 +        while ((e = av_dict_get(ost->swr_opts, "", e,
 +                                AV_DICT_IGNORE_SUFFIX))) {
 +            av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
 +        }
 +        if (strlen(args))
 +            args[strlen(args)-1] = 0;
 +        av_opt_set(fg->graph, "aresample_swr_opts", args, 0);
 +
 +        args[0] = '\0';
 +        while ((e = av_dict_get(fg->outputs[0]->ost->resample_opts, "", e,
 +                                AV_DICT_IGNORE_SUFFIX))) {
 +            av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
 +        }
 +        if (strlen(args))
 +            args[strlen(args) - 1] = '\0';
 +        fg->graph->resample_lavr_opts = av_strdup(args);
 +
 +        e = av_dict_get(ost->encoder_opts, "threads", NULL, 0);
 +        if (e)
 +            av_opt_set(fg->graph, "threads", e->value, 0);
 +    }
 +
 +    if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
 +        return ret;
 +
 +    if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
 +        const char *num_inputs;
 +        const char *num_outputs;
 +        if (!outputs) {
 +            num_outputs = "0";
 +        } else if (outputs->next) {
 +            num_outputs = ">1";
 +        } else {
 +            num_outputs = "1";
 +        }
 +        if (!inputs) {
 +            num_inputs = "0";
 +        } else if (inputs->next) {
 +            num_inputs = ">1";
 +        } else {
 +            num_inputs = "1";
 +        }
 +        av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' was expected "
 +               "to have exactly 1 input and 1 output."
 +               " However, it had %s input(s) and %s output(s)."
 +               " Please adjust, or use a complex filtergraph (-filter_complex) instead.\n",
 +               graph_desc, num_inputs, num_outputs);
 +        return AVERROR(EINVAL);
 +    }
 +
 +    for (cur = inputs, i = 0; cur; cur = cur->next, i++)
 +        if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0) {
 +            avfilter_inout_free(&inputs);
 +            avfilter_inout_free(&outputs);
 +            return ret;
 +        }
 +    avfilter_inout_free(&inputs);
 +
++    for (cur = outputs, i = 0; cur; cur = cur->next, i++) {
++        OutputFilter *ofilter = fg->outputs[i];
++        if (ofilter->ost)
++            configure_output_filter(fg, ofilter, cur);
++    }
++
 +    avfilter_inout_free(&outputs);
 +
 +    if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
 +        return ret;
 +
 +    fg->reconfiguration = 1;
 +
 +    for (i = 0; i < fg->nb_outputs; i++) {
 +        OutputStream *ost = fg->outputs[i]->ost;
 +        if (ost &&
 +            ost->enc->type == AVMEDIA_TYPE_AUDIO &&
 +            !(ost->enc->capabilities & AV_CODEC_CAP_VARIABLE_FRAME_SIZE))
 +            av_buffersink_set_frame_size(ost->filter->filter,
 +                                         ost->enc_ctx->frame_size);
 +    }
 +
 +    return 0;
 +}
 +
 +int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
 +{
 +    int i;
 +    for (i = 0; i < fg->nb_inputs; i++)
 +        if (fg->inputs[i]->ist == ist)
 +            return 1;
 +    return 0;
 +}
 +