avformat/hlsenc: creation of hls master playlist file
[ffmpeg.git] / libavformat / hlsenc.c
index 843f37d..8cd5ed5 100644 (file)
 /*
  * Apple HTTP Live Streaming segmenter
  * Copyright (c) 2012, Luca Barbato
+ * Copyright (c) 2017 Akamai Technologies, Inc.
  *
- * 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 "config.h"
 #include <float.h>
 #include <stdint.h>
+#if HAVE_UNISTD_H
+#include <unistd.h>
+#endif
 
+#if CONFIG_GCRYPT
+#include <gcrypt.h>
+#elif CONFIG_OPENSSL
+#include <openssl/rand.h>
+#endif
+
+#include "libavutil/avassert.h"
 #include "libavutil/mathematics.h"
 #include "libavutil/parseutils.h"
 #include "libavutil/avstring.h"
+#include "libavutil/intreadwrite.h"
+#include "libavutil/random_seed.h"
 #include "libavutil/opt.h"
 #include "libavutil/log.h"
+#include "libavutil/time_internal.h"
 
 #include "avformat.h"
+#include "avio_internal.h"
 #include "internal.h"
-
-typedef struct ListEntry {
-    char  name[1024];
-    int64_t duration;     // segment duration in AV_TIME_BASE units
-    struct ListEntry *next;
-} ListEntry;
-
-typedef struct HLSContext {
-    const AVClass *class;  // Class for private options.
+#include "os_support.h"
+
+typedef enum {
+  HLS_START_SEQUENCE_AS_START_NUMBER = 0,
+  HLS_START_SEQUENCE_AS_SECONDS_SINCE_EPOCH = 1,
+  HLS_START_SEQUENCE_AS_FORMATTED_DATETIME = 2,  // YYYYMMDDhhmmss
+} StartSequenceSourceType;
+
+#define KEYSIZE 16
+#define LINE_BUFFER_SIZE 1024
+#define HLS_MICROSECOND_UNIT   1000000
+#define POSTFIX_PATTERN "_%d"
+
+typedef struct HLSSegment {
+    char filename[1024];
+    char sub_filename[1024];
+    double duration; /* in seconds */
+    int discont;
+    int64_t pos;
+    int64_t size;
+
+    char key_uri[LINE_BUFFER_SIZE + 1];
+    char iv_string[KEYSIZE*2 + 1];
+
+    struct HLSSegment *next;
+} HLSSegment;
+
+typedef enum HLSFlags {
+    // Generate a single media file and use byte ranges in the playlist.
+    HLS_SINGLE_FILE = (1 << 0),
+    HLS_DELETE_SEGMENTS = (1 << 1),
+    HLS_ROUND_DURATIONS = (1 << 2),
+    HLS_DISCONT_START = (1 << 3),
+    HLS_OMIT_ENDLIST = (1 << 4),
+    HLS_SPLIT_BY_TIME = (1 << 5),
+    HLS_APPEND_LIST = (1 << 6),
+    HLS_PROGRAM_DATE_TIME = (1 << 7),
+    HLS_SECOND_LEVEL_SEGMENT_INDEX = (1 << 8), // include segment index in segment filenames when use_localtime  e.g.: %%03d
+    HLS_SECOND_LEVEL_SEGMENT_DURATION = (1 << 9), // include segment duration (microsec) in segment filenames when use_localtime  e.g.: %%09t
+    HLS_SECOND_LEVEL_SEGMENT_SIZE = (1 << 10), // include segment size (bytes) in segment filenames when use_localtime  e.g.: %%014s
+    HLS_TEMP_FILE = (1 << 11),
+    HLS_PERIODIC_REKEY = (1 << 12),
+} HLSFlags;
+
+typedef enum {
+    SEGMENT_TYPE_MPEGTS,
+    SEGMENT_TYPE_FMP4,
+} SegmentType;
+
+typedef enum {
+    PLAYLIST_TYPE_NONE,
+    PLAYLIST_TYPE_EVENT,
+    PLAYLIST_TYPE_VOD,
+    PLAYLIST_TYPE_NB,
+} PlaylistType;
+
+typedef struct VariantStream {
     unsigned number;
     int64_t sequence;
-    int64_t start_sequence;
     AVOutputFormat *oformat;
+    AVOutputFormat *vtt_oformat;
+    AVIOContext *out;
+    int packets_written;
+    int init_range_length;
+
     AVFormatContext *avf;
-    float time;            // Set by a private option.
-    int  size;             // Set by a private option.
-    int  wrap;             // Set by a private option.
-    int  version;          // Set by a private option.
-    int  allowcache;
-    int64_t recording_time;
+    AVFormatContext *vtt_avf;
+
     int has_video;
-    // The following timestamps are in AV_TIME_BASE units.
+    int has_subtitle;
+    int new_start;
+    double dpp;           // duration per packet
     int64_t start_pts;
     int64_t end_pts;
-    int64_t duration;      // last segment duration computed so far.
+    double duration;      // last segment duration computed so far, in seconds
+    int64_t start_pos;    // last segment starting position
+    int64_t size;         // last segment size
     int nb_entries;
-    ListEntry *list;
-    ListEntry *end_list;
+    int discontinuity_set;
+    int discontinuity;
+
+    HLSSegment *segments;
+    HLSSegment *last_segment;
+    HLSSegment *old_segments;
+
     char *basename;
+    char *vtt_basename;
+    char *vtt_m3u8_name;
+    char *m3u8_name;
+
+    double initial_prog_date_time;
+    char current_segment_final_filename_fmt[1024]; // when renaming segments
+
+    char *fmp4_init_filename;
+    char *base_output_dirname;
+    int fmp4_init_mode;
+
+    AVStream **streams;
+    unsigned int nb_streams;
+    int m3u8_created; /* status of media play-list creation */
+    char *baseurl;
+} VariantStream;
+
+typedef struct HLSContext {
+    const AVClass *class;  // Class for private options.
+    int64_t start_sequence;
+    uint32_t start_sequence_source_type;  // enum StartSequenceSourceType
+
+    float time;            // Set by a private option.
+    float init_time;       // Set by a private option.
+    int max_nb_segments;   // Set by a private option.
+#if FF_API_HLS_WRAP
+    int  wrap;             // Set by a private option.
+#endif
+    uint32_t flags;        // enum HLSFlags
+    uint32_t pl_type;      // enum PlaylistType
+    char *segment_filename;
+    char *fmp4_init_filename;
+    int segment_type;
+
+    int use_localtime;      ///< flag to expand filename with localtime
+    int use_localtime_mkdir;///< flag to mkdir dirname in timebased filename
+    int allowcache;
+    int64_t recording_time;
+    int64_t max_seg_size; // every segment file max size
+
     char *baseurl;
+    char *format_options_str;
+    char *vtt_format_options_str;
+    char *subtitle_filename;
+    AVDictionary *format_options;
+
+    int encrypt;
+    char *key;
+    char *key_url;
+    char *iv;
+    char *key_basename;
+    int encrypt_started;
+
+    char *key_info_file;
+    char key_file[LINE_BUFFER_SIZE + 1];
+    char key_uri[LINE_BUFFER_SIZE + 1];
+    char key_string[KEYSIZE*2 + 1];
+    char iv_string[KEYSIZE*2 + 1];
+    AVDictionary *vtt_format_options;
+
+    char *method;
+    char *user_agent;
+
+    VariantStream *var_streams;
+    unsigned int nb_varstreams;
+
+    int master_m3u8_created; /* status of master play-list creation */
+    char *master_m3u8_url; /* URL of the master m3u8 file */
+    int version; /* HLS version */
+    char *var_stream_map; /* user specified variant stream map string */
+    char *master_pl_name;
+    unsigned int master_publish_rate;
 } HLSContext;
 
-static int hls_mux_init(AVFormatContext *s)
+static int get_int_from_double(double val)
+{
+    return (int)((val - (int)val) >= 0.001) ? (int)(val + 1) : (int)val;
+}
+
+static int mkdir_p(const char *path) {
+    int ret = 0;
+    char *temp = av_strdup(path);
+    char *pos = temp;
+    char tmp_ch = '\0';
+
+    if (!path || !temp) {
+        return -1;
+    }
+
+    if (!strncmp(temp, "/", 1) || !strncmp(temp, "\\", 1)) {
+        pos++;
+    } else if (!strncmp(temp, "./", 2) || !strncmp(temp, ".\\", 2)) {
+        pos += 2;
+    }
+
+    for ( ; *pos != '\0'; ++pos) {
+        if (*pos == '/' || *pos == '\\') {
+            tmp_ch = *pos;
+            *pos = '\0';
+            ret = mkdir(temp, 0755);
+            *pos = tmp_ch;
+        }
+    }
+
+    if ((*(pos - 1) != '/') || (*(pos - 1) != '\\')) {
+        ret = mkdir(temp, 0755);
+    }
+
+    av_free(temp);
+    return ret;
+}
+
+static void set_http_options(AVFormatContext *s, AVDictionary **options, HLSContext *c)
+{
+    const char *proto = avio_find_protocol_name(s->filename);
+    int http_base_proto = proto ? (!av_strcasecmp(proto, "http") || !av_strcasecmp(proto, "https")) : 0;
+
+    if (c->method) {
+        av_dict_set(options, "method", c->method, 0);
+    } else if (http_base_proto) {
+        av_log(c, AV_LOG_WARNING, "No HTTP method set, hls muxer defaulting to method PUT.\n");
+        av_dict_set(options, "method", "PUT", 0);
+    }
+    if (c->user_agent)
+        av_dict_set(options, "user_agent", c->user_agent, 0);
+
+}
+
+static int replace_int_data_in_filename(char *buf, int buf_size, const char *filename, char placeholder, int64_t number)
+{
+    const char *p;
+    char *q, buf1[20], c;
+    int nd, len, addchar_count;
+    int found_count = 0;
+
+    q = buf;
+    p = filename;
+    for (;;) {
+        c = *p;
+        if (c == '\0')
+            break;
+        if (c == '%' && *(p+1) == '%')  // %%
+            addchar_count = 2;
+        else if (c == '%' && (av_isdigit(*(p+1)) || *(p+1) == placeholder)) {
+            nd = 0;
+            addchar_count = 1;
+            while (av_isdigit(*(p + addchar_count))) {
+                nd = nd * 10 + *(p + addchar_count) - '0';
+                addchar_count++;
+            }
+
+            if (*(p + addchar_count) == placeholder) {
+                len = snprintf(buf1, sizeof(buf1), "%0*"PRId64, (number < 0) ? nd : nd++, number);
+                if (len < 1)  // returned error or empty buf1
+                    goto fail;
+                if ((q - buf + len) > buf_size - 1)
+                    goto fail;
+                memcpy(q, buf1, len);
+                q += len;
+                p += (addchar_count + 1);
+                addchar_count = 0;
+                found_count++;
+            }
+
+        } else
+            addchar_count = 1;
+
+        while (addchar_count--)
+            if ((q - buf) < buf_size - 1)
+                *q++ = *p++;
+            else
+                goto fail;
+    }
+    *q = '\0';
+    return found_count;
+fail:
+    *q = '\0';
+    return -1;
+}
+
+static void write_styp(AVIOContext *pb)
+{
+    avio_wb32(pb, 24);
+    ffio_wfourcc(pb, "styp");
+    ffio_wfourcc(pb, "msdh");
+    avio_wb32(pb, 0); /* minor */
+    ffio_wfourcc(pb, "msdh");
+    ffio_wfourcc(pb, "msix");
+}
+
+static int hls_delete_old_segments(AVFormatContext *s, HLSContext *hls,
+                                   VariantStream *vs) {
+
+    HLSSegment *segment, *previous_segment = NULL;
+    float playlist_duration = 0.0f;
+    int ret = 0, path_size, sub_path_size;
+    char *dirname = NULL, *p, *sub_path;
+    char *path = NULL;
+    AVDictionary *options = NULL;
+    AVIOContext *out = NULL;
+    const char *proto = NULL;
+
+    segment = vs->segments;
+    while (segment) {
+        playlist_duration += segment->duration;
+        segment = segment->next;
+    }
+
+    segment = vs->old_segments;
+    while (segment) {
+        playlist_duration -= segment->duration;
+        previous_segment = segment;
+        segment = previous_segment->next;
+        if (playlist_duration <= -previous_segment->duration) {
+            previous_segment->next = NULL;
+            break;
+        }
+    }
+
+    if (segment && !hls->use_localtime_mkdir) {
+        if (hls->segment_filename) {
+            dirname = av_strdup(hls->segment_filename);
+        } else {
+            dirname = av_strdup(vs->avf->filename);
+        }
+        if (!dirname) {
+            ret = AVERROR(ENOMEM);
+            goto fail;
+        }
+        p = (char *)av_basename(dirname);
+        *p = '\0';
+    }
+
+    while (segment) {
+        av_log(hls, AV_LOG_DEBUG, "deleting old segment %s\n",
+                                  segment->filename);
+        path_size =  (hls->use_localtime_mkdir ? 0 : strlen(dirname)) + strlen(segment->filename) + 1;
+        path = av_malloc(path_size);
+        if (!path) {
+            ret = AVERROR(ENOMEM);
+            goto fail;
+        }
+
+        if (hls->use_localtime_mkdir)
+            av_strlcpy(path, segment->filename, path_size);
+        else { // segment->filename contains basename only
+            av_strlcpy(path, dirname, path_size);
+            av_strlcat(path, segment->filename, path_size);
+        }
+
+        proto = avio_find_protocol_name(s->filename);
+        if (hls->method || (proto && !av_strcasecmp(proto, "http"))) {
+            av_dict_set(&options, "method", "DELETE", 0);
+            if ((ret = vs->avf->io_open(vs->avf, &out, path, AVIO_FLAG_WRITE, &options)) < 0)
+                goto fail;
+            ff_format_io_close(vs->avf, &out);
+        } else if (unlink(path) < 0) {
+            av_log(hls, AV_LOG_ERROR, "failed to delete old segment %s: %s\n",
+                                     path, strerror(errno));
+        }
+
+        if ((segment->sub_filename[0] != '\0')) {
+            sub_path_size = strlen(segment->sub_filename) + 1 + (dirname ? strlen(dirname) : 0);
+            sub_path = av_malloc(sub_path_size);
+            if (!sub_path) {
+                ret = AVERROR(ENOMEM);
+                goto fail;
+            }
+
+            av_strlcpy(sub_path, dirname, sub_path_size);
+            av_strlcat(sub_path, segment->sub_filename, sub_path_size);
+
+            if (hls->method || (proto && !av_strcasecmp(proto, "http"))) {
+                av_dict_set(&options, "method", "DELETE", 0);
+                if ((ret = vs->avf->io_open(vs->avf, &out, sub_path, AVIO_FLAG_WRITE, &options)) < 0) {
+                    av_free(sub_path);
+                    goto fail;
+                }
+                ff_format_io_close(vs->avf, &out);
+            } else if (unlink(sub_path) < 0) {
+                av_log(hls, AV_LOG_ERROR, "failed to delete old segment %s: %s\n",
+                                         sub_path, strerror(errno));
+            }
+            av_free(sub_path);
+        }
+        av_freep(&path);
+        previous_segment = segment;
+        segment = previous_segment->next;
+        av_free(previous_segment);
+    }
+
+fail:
+    av_free(path);
+    av_free(dirname);
+
+    return ret;
+}
+
+static int randomize(uint8_t *buf, int len)
+{
+#if CONFIG_GCRYPT
+    gcry_randomize(buf, len, GCRY_VERY_STRONG_RANDOM);
+    return 0;
+#elif CONFIG_OPENSSL
+    if (RAND_bytes(buf, len))
+        return 0;
+#else
+    return AVERROR(ENOSYS);
+#endif
+    return AVERROR(EINVAL);
+}
+
+static int do_encrypt(AVFormatContext *s, VariantStream *vs)
+{
+    HLSContext *hls = s->priv_data;
+    int ret;
+    int len;
+    AVIOContext *pb;
+    uint8_t key[KEYSIZE];
+
+    len = strlen(s->filename) + 4 + 1;
+    hls->key_basename = av_mallocz(len);
+    if (!hls->key_basename)
+        return AVERROR(ENOMEM);
+
+    av_strlcpy(hls->key_basename, s->filename, len);
+    av_strlcat(hls->key_basename, ".key", len);
+
+    if (hls->key_url) {
+        av_strlcpy(hls->key_file, hls->key_url, sizeof(hls->key_file));
+        av_strlcpy(hls->key_uri, hls->key_url, sizeof(hls->key_uri));
+    } else {
+        av_strlcpy(hls->key_file, hls->key_basename, sizeof(hls->key_file));
+        av_strlcpy(hls->key_uri, hls->key_basename, sizeof(hls->key_uri));
+    }
+
+    if (!*hls->iv_string) {
+        uint8_t iv[16] = { 0 };
+        char buf[33];
+
+        if (!hls->iv) {
+            AV_WB64(iv + 8, vs->sequence);
+        } else {
+            memcpy(iv, hls->iv, sizeof(iv));
+        }
+        ff_data_to_hex(buf, iv, sizeof(iv), 0);
+        buf[32] = '\0';
+        memcpy(hls->iv_string, buf, sizeof(hls->iv_string));
+    }
+
+    if (!*hls->key_uri) {
+        av_log(hls, AV_LOG_ERROR, "no key URI specified in key info file\n");
+        return AVERROR(EINVAL);
+    }
+
+    if (!*hls->key_file) {
+        av_log(hls, AV_LOG_ERROR, "no key file specified in key info file\n");
+        return AVERROR(EINVAL);
+    }
+
+    if (!*hls->key_string) {
+        if (!hls->key) {
+            if ((ret = randomize(key, sizeof(key))) < 0) {
+                av_log(s, AV_LOG_ERROR, "Cannot generate a strong random key\n");
+                return ret;
+            }
+        } else {
+            memcpy(key, hls->key, sizeof(key));
+        }
+
+        ff_data_to_hex(hls->key_string, key, sizeof(key), 0);
+        if ((ret = s->io_open(s, &pb, hls->key_file, AVIO_FLAG_WRITE, NULL)) < 0)
+            return ret;
+        avio_seek(pb, 0, SEEK_CUR);
+        avio_write(pb, key, KEYSIZE);
+        avio_close(pb);
+    }
+    return 0;
+}
+
+
+static int hls_encryption_start(AVFormatContext *s)
+{
+    HLSContext *hls = s->priv_data;
+    int ret;
+    AVIOContext *pb;
+    uint8_t key[KEYSIZE];
+
+    if ((ret = s->io_open(s, &pb, hls->key_info_file, AVIO_FLAG_READ, NULL)) < 0) {
+        av_log(hls, AV_LOG_ERROR,
+                "error opening key info file %s\n", hls->key_info_file);
+        return ret;
+    }
+
+    ff_get_line(pb, hls->key_uri, sizeof(hls->key_uri));
+    hls->key_uri[strcspn(hls->key_uri, "\r\n")] = '\0';
+
+    ff_get_line(pb, hls->key_file, sizeof(hls->key_file));
+    hls->key_file[strcspn(hls->key_file, "\r\n")] = '\0';
+
+    ff_get_line(pb, hls->iv_string, sizeof(hls->iv_string));
+    hls->iv_string[strcspn(hls->iv_string, "\r\n")] = '\0';
+
+    ff_format_io_close(s, &pb);
+
+    if (!*hls->key_uri) {
+        av_log(hls, AV_LOG_ERROR, "no key URI specified in key info file\n");
+        return AVERROR(EINVAL);
+    }
+
+    if (!*hls->key_file) {
+        av_log(hls, AV_LOG_ERROR, "no key file specified in key info file\n");
+        return AVERROR(EINVAL);
+    }
+
+    if ((ret = s->io_open(s, &pb, hls->key_file, AVIO_FLAG_READ, NULL)) < 0) {
+        av_log(hls, AV_LOG_ERROR, "error opening key file %s\n", hls->key_file);
+        return ret;
+    }
+
+    ret = avio_read(pb, key, sizeof(key));
+    ff_format_io_close(s, &pb);
+    if (ret != sizeof(key)) {
+        av_log(hls, AV_LOG_ERROR, "error reading key file %s\n", hls->key_file);
+        if (ret >= 0 || ret == AVERROR_EOF)
+            ret = AVERROR(EINVAL);
+        return ret;
+    }
+    ff_data_to_hex(hls->key_string, key, sizeof(key), 0);
+
+    return 0;
+}
+
+static int read_chomp_line(AVIOContext *s, char *buf, int maxlen)
+{
+    int len = ff_get_line(s, buf, maxlen);
+    while (len > 0 && av_isspace(buf[len - 1]))
+        buf[--len] = '\0';
+    return len;
+}
+
+static int hls_mux_init(AVFormatContext *s, VariantStream *vs)
 {
+    AVDictionary *options = NULL;
     HLSContext *hls = s->priv_data;
     AVFormatContext *oc;
-    int i;
+    AVFormatContext *vtt_oc = NULL;
+    int byterange_mode = (hls->flags & HLS_SINGLE_FILE) || (hls->max_seg_size > 0);
+    int i, ret;
 
-    hls->avf = oc = avformat_alloc_context();
-    if (!oc)
-        return AVERROR(ENOMEM);
+    ret = avformat_alloc_output_context2(&vs->avf, vs->oformat, NULL, NULL);
+    if (ret < 0)
+        return ret;
+    oc = vs->avf;
 
-    oc->oformat            = hls->oformat;
+    oc->filename[0]        = '\0';
+    oc->oformat            = vs->oformat;
     oc->interrupt_callback = s->interrupt_callback;
+    oc->max_delay          = s->max_delay;
     oc->opaque             = s->opaque;
     oc->io_open            = s->io_open;
     oc->io_close           = s->io_close;
+    av_dict_copy(&oc->metadata, s->metadata, 0);
+
+    if(vs->vtt_oformat) {
+        ret = avformat_alloc_output_context2(&vs->vtt_avf, vs->vtt_oformat, NULL, NULL);
+        if (ret < 0)
+            return ret;
+        vtt_oc          = vs->vtt_avf;
+        vtt_oc->oformat = vs->vtt_oformat;
+        av_dict_copy(&vtt_oc->metadata, s->metadata, 0);
+    }
 
-    for (i = 0; i < s->nb_streams; i++) {
+    for (i = 0; i < vs->nb_streams; i++) {
         AVStream *st;
-        if (!(st = avformat_new_stream(oc, NULL)))
+        AVFormatContext *loc;
+        if (vs->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE)
+            loc = vtt_oc;
+        else
+            loc = oc;
+
+        if (!(st = avformat_new_stream(loc, NULL)))
             return AVERROR(ENOMEM);
-        avcodec_copy_context(st->codec, s->streams[i]->codec);
-        st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
-        st->time_base = s->streams[i]->time_base;
+        avcodec_parameters_copy(st->codecpar, vs->streams[i]->codecpar);
+        if (!oc->oformat->codec_tag ||
+            av_codec_get_id (oc->oformat->codec_tag, vs->streams[i]->codecpar->codec_tag) == st->codecpar->codec_id ||
+            av_codec_get_tag(oc->oformat->codec_tag, vs->streams[i]->codecpar->codec_id) <= 0) {
+            st->codecpar->codec_tag = vs->streams[i]->codecpar->codec_tag;
+        } else {
+            st->codecpar->codec_tag = 0;
+        }
+
+        st->sample_aspect_ratio = vs->streams[i]->sample_aspect_ratio;
+        st->time_base = vs->streams[i]->time_base;
+        av_dict_copy(&st->metadata, vs->streams[i]->metadata, 0);
     }
 
+    vs->packets_written = 1;
+    vs->start_pos = 0;
+    vs->new_start = 1;
+    vs->fmp4_init_mode = 0;
+
+    if (hls->segment_type == SEGMENT_TYPE_FMP4) {
+        if (hls->max_seg_size > 0) {
+            av_log(s, AV_LOG_WARNING, "Multi-file byterange mode is currently unsupported in the HLS muxer.\n");
+            return AVERROR_PATCHWELCOME;
+        }
+
+        vs->packets_written = 0;
+        vs->init_range_length = 0;
+        vs->fmp4_init_mode = !byterange_mode;
+        set_http_options(s, &options, hls);
+        if ((ret = avio_open_dyn_buf(&oc->pb)) < 0)
+            return ret;
+
+        if ((ret = s->io_open(s, &vs->out, vs->base_output_dirname, AVIO_FLAG_WRITE, &options)) < 0) {
+            av_log(s, AV_LOG_ERROR, "Failed to open segment '%s'\n", vs->fmp4_init_filename);
+            return ret;
+        }
+
+        if (hls->format_options_str) {
+            ret = av_dict_parse_string(&hls->format_options, hls->format_options_str, "=", ":", 0);
+            if (ret < 0) {
+                av_log(s, AV_LOG_ERROR, "Could not parse format options list '%s'\n",
+                       hls->format_options_str);
+                return ret;
+            }
+        }
+
+        av_dict_copy(&options, hls->format_options, 0);
+        av_dict_set(&options, "fflags", "-autobsf", 0);
+        av_dict_set(&options, "movflags", "frag_custom+dash+delay_moov", 0);
+        ret = avformat_init_output(oc, &options);
+        if (ret < 0)
+            return ret;
+        if (av_dict_count(options)) {
+            av_log(s, AV_LOG_ERROR, "Some of the provided format options in '%s' are not recognized\n", hls->format_options_str);
+            av_dict_free(&options);
+            return AVERROR(EINVAL);
+        }
+        avio_flush(oc->pb);
+        av_dict_free(&options);
+    }
+    return 0;
+}
+
+static HLSSegment *find_segment_by_filename(HLSSegment *segment, const char *filename)
+{
+    while (segment) {
+        if (!av_strcasecmp(segment->filename,filename))
+            return segment;
+        segment = segment->next;
+    }
+    return (HLSSegment *) NULL;
+}
+
+static int sls_flags_filename_process(struct AVFormatContext *s, HLSContext *hls,
+                                      VariantStream *vs, HLSSegment *en,
+                                      double duration, int64_t pos, int64_t size)
+{
+    if ((hls->flags & (HLS_SECOND_LEVEL_SEGMENT_SIZE | HLS_SECOND_LEVEL_SEGMENT_DURATION)) &&
+        strlen(vs->current_segment_final_filename_fmt)) {
+        av_strlcpy(vs->avf->filename, vs->current_segment_final_filename_fmt, sizeof(vs->avf->filename));
+        if (hls->flags & HLS_SECOND_LEVEL_SEGMENT_SIZE) {
+            char * filename = av_strdup(vs->avf->filename);  // %%s will be %s after strftime
+            if (!filename) {
+                av_free(en);
+                return AVERROR(ENOMEM);
+            }
+            if (replace_int_data_in_filename(vs->avf->filename, sizeof(vs->avf->filename),
+                filename, 's', pos + size) < 1) {
+                av_log(hls, AV_LOG_ERROR,
+                       "Invalid second level segment filename template '%s', "
+                        "you can try to remove second_level_segment_size flag\n",
+                       filename);
+                av_free(filename);
+                av_free(en);
+                return AVERROR(EINVAL);
+            }
+            av_free(filename);
+        }
+        if (hls->flags & HLS_SECOND_LEVEL_SEGMENT_DURATION) {
+            char * filename = av_strdup(vs->avf->filename);  // %%t will be %t after strftime
+            if (!filename) {
+                av_free(en);
+                return AVERROR(ENOMEM);
+            }
+            if (replace_int_data_in_filename(vs->avf->filename, sizeof(vs->avf->filename),
+                filename, 't',  (int64_t)round(duration * HLS_MICROSECOND_UNIT)) < 1) {
+                av_log(hls, AV_LOG_ERROR,
+                       "Invalid second level segment filename template '%s', "
+                        "you can try to remove second_level_segment_time flag\n",
+                       filename);
+                av_free(filename);
+                av_free(en);
+                return AVERROR(EINVAL);
+            }
+            av_free(filename);
+        }
+    }
     return 0;
 }
 
-static int append_entry(HLSContext *hls, int64_t duration)
+static int sls_flag_check_duration_size_index(HLSContext *hls)
 {
-    ListEntry *en = av_malloc(sizeof(*en));
+    int ret = 0;
+
+    if (hls->flags & HLS_SECOND_LEVEL_SEGMENT_DURATION) {
+         av_log(hls, AV_LOG_ERROR,
+                "second_level_segment_duration hls_flag requires use_localtime to be true\n");
+         ret = AVERROR(EINVAL);
+    }
+    if (hls->flags & HLS_SECOND_LEVEL_SEGMENT_SIZE) {
+         av_log(hls, AV_LOG_ERROR,
+                "second_level_segment_size hls_flag requires use_localtime to be true\n");
+         ret = AVERROR(EINVAL);
+    }
+    if (hls->flags & HLS_SECOND_LEVEL_SEGMENT_INDEX) {
+        av_log(hls, AV_LOG_ERROR,
+               "second_level_segment_index hls_flag requires use_localtime to be true\n");
+        ret = AVERROR(EINVAL);
+    }
+
+    return ret;
+}
+
+static int sls_flag_check_duration_size(HLSContext *hls, VariantStream *vs)
+{
+    const char *proto = avio_find_protocol_name(vs->basename);
+    int segment_renaming_ok = proto && !strcmp(proto, "file");
+    int ret = 0;
+
+    if ((hls->flags & HLS_SECOND_LEVEL_SEGMENT_DURATION) && !segment_renaming_ok) {
+         av_log(hls, AV_LOG_ERROR,
+                "second_level_segment_duration hls_flag works only with file protocol segment names\n");
+         ret = AVERROR(EINVAL);
+    }
+    if ((hls->flags & HLS_SECOND_LEVEL_SEGMENT_SIZE) && !segment_renaming_ok) {
+         av_log(hls, AV_LOG_ERROR,
+                "second_level_segment_size hls_flag works only with file protocol segment names\n");
+         ret = AVERROR(EINVAL);
+    }
+
+    return ret;
+}
+
+static void sls_flag_file_rename(HLSContext *hls, VariantStream *vs, char *old_filename) {
+    if ((hls->flags & (HLS_SECOND_LEVEL_SEGMENT_SIZE | HLS_SECOND_LEVEL_SEGMENT_DURATION)) &&
+        strlen(vs->current_segment_final_filename_fmt)) {
+        ff_rename(old_filename, vs->avf->filename, hls);
+    }
+}
+
+static int sls_flag_use_localtime_filename(AVFormatContext *oc, HLSContext *c, VariantStream *vs)
+{
+    if (c->flags & HLS_SECOND_LEVEL_SEGMENT_INDEX) {
+        char * filename = av_strdup(oc->filename);  // %%d will be %d after strftime
+        if (!filename)
+            return AVERROR(ENOMEM);
+        if (replace_int_data_in_filename(oc->filename, sizeof(oc->filename),
+#if FF_API_HLS_WRAP
+            filename, 'd', c->wrap ? vs->sequence % c->wrap : vs->sequence) < 1) {
+#else
+            filename, 'd', vs->sequence) < 1) {
+#endif
+            av_log(c, AV_LOG_ERROR, "Invalid second level segment filename template '%s', "
+                    "you can try to remove second_level_segment_index flag\n",
+                   filename);
+            av_free(filename);
+            return AVERROR(EINVAL);
+        }
+        av_free(filename);
+    }
+    if (c->flags & (HLS_SECOND_LEVEL_SEGMENT_SIZE | HLS_SECOND_LEVEL_SEGMENT_DURATION)) {
+        av_strlcpy(vs->current_segment_final_filename_fmt, oc->filename,
+                   sizeof(vs->current_segment_final_filename_fmt));
+        if (c->flags & HLS_SECOND_LEVEL_SEGMENT_SIZE) {
+            char * filename = av_strdup(oc->filename);  // %%s will be %s after strftime
+            if (!filename)
+                return AVERROR(ENOMEM);
+            if (replace_int_data_in_filename(oc->filename, sizeof(oc->filename), filename, 's', 0) < 1) {
+                av_log(c, AV_LOG_ERROR, "Invalid second level segment filename template '%s', "
+                        "you can try to remove second_level_segment_size flag\n",
+                       filename);
+                av_free(filename);
+                return AVERROR(EINVAL);
+            }
+            av_free(filename);
+        }
+        if (c->flags & HLS_SECOND_LEVEL_SEGMENT_DURATION) {
+            char * filename = av_strdup(oc->filename);  // %%t will be %t after strftime
+            if (!filename)
+                return AVERROR(ENOMEM);
+            if (replace_int_data_in_filename(oc->filename, sizeof(oc->filename), filename, 't', 0) < 1) {
+                av_log(c, AV_LOG_ERROR, "Invalid second level segment filename template '%s', "
+                        "you can try to remove second_level_segment_time flag\n",
+                       filename);
+                av_free(filename);
+                return AVERROR(EINVAL);
+            }
+            av_free(filename);
+        }
+    }
+    return 0;
+}
+
+/* Create a new segment and append it to the segment list */
+static int hls_append_segment(struct AVFormatContext *s, HLSContext *hls,
+                              VariantStream *vs, double duration, int64_t pos,
+                              int64_t size)
+{
+    HLSSegment *en = av_malloc(sizeof(*en));
+    const char  *filename;
+    int byterange_mode = (hls->flags & HLS_SINGLE_FILE) || (hls->max_seg_size > 0);
+    int ret;
 
     if (!en)
         return AVERROR(ENOMEM);
 
-    av_strlcpy(en->name, av_basename(hls->avf->filename), sizeof(en->name));
+    ret = sls_flags_filename_process(s, hls, vs, en, duration, pos, size);
+    if (ret < 0) {
+        return ret;
+    }
+
+    filename = av_basename(vs->avf->filename);
+
+    if (hls->use_localtime_mkdir) {
+        filename = vs->avf->filename;
+    }
+    if ((find_segment_by_filename(vs->segments, filename) || find_segment_by_filename(vs->old_segments, filename))
+        && !byterange_mode) {
+        av_log(hls, AV_LOG_WARNING, "Duplicated segment filename detected: %s\n", filename);
+    }
+    av_strlcpy(en->filename, filename, sizeof(en->filename));
+
+    if(vs->has_subtitle)
+        av_strlcpy(en->sub_filename, av_basename(vs->vtt_avf->filename), sizeof(en->sub_filename));
+    else
+        en->sub_filename[0] = '\0';
 
     en->duration = duration;
+    en->pos      = pos;
+    en->size     = size;
     en->next     = NULL;
+    en->discont  = 0;
 
-    if (!hls->list)
-        hls->list = en;
-    else
-        hls->end_list->next = en;
+    if (vs->discontinuity) {
+        en->discont = 1;
+        vs->discontinuity = 0;
+    }
 
-    hls->end_list = en;
+    if (hls->key_info_file || hls->encrypt) {
+        av_strlcpy(en->key_uri, hls->key_uri, sizeof(en->key_uri));
+        av_strlcpy(en->iv_string, hls->iv_string, sizeof(en->iv_string));
+    }
 
-    if (hls->nb_entries >= hls->size) {
-        en = hls->list;
-        hls->list = en->next;
-        av_free(en);
+    if (!vs->segments)
+        vs->segments = en;
+    else
+        vs->last_segment->next = en;
+
+    vs->last_segment = en;
+
+    // EVENT or VOD playlists imply sliding window cannot be used
+    if (hls->pl_type != PLAYLIST_TYPE_NONE)
+        hls->max_nb_segments = 0;
+
+    if (hls->max_nb_segments && vs->nb_entries >= hls->max_nb_segments) {
+        en = vs->segments;
+        vs->initial_prog_date_time += en->duration;
+        vs->segments = en->next;
+        if (en && hls->flags & HLS_DELETE_SEGMENTS &&
+#if FF_API_HLS_WRAP
+                !(hls->flags & HLS_SINGLE_FILE || hls->wrap)) {
+#else
+                !(hls->flags & HLS_SINGLE_FILE)) {
+#endif
+            en->next = vs->old_segments;
+            vs->old_segments = en;
+            if ((ret = hls_delete_old_segments(s, hls, vs)) < 0)
+                return ret;
+        } else
+            av_free(en);
     } else
-        hls->nb_entries++;
+        vs->nb_entries++;
 
-    hls->sequence++;
+    if (hls->max_seg_size > 0) {
+        return 0;
+    }
+    vs->sequence++;
 
     return 0;
 }
 
-static void free_entries(HLSContext *hls)
+static int parse_playlist(AVFormatContext *s, const char *url, VariantStream *vs)
 {
-    ListEntry *p = hls->list, *en;
+    HLSContext *hls = s->priv_data;
+    AVIOContext *in;
+    int ret = 0, is_segment = 0;
+    int64_t new_start_pos;
+    char line[1024];
+    const char *ptr;
+    const char *end;
+
+    if ((ret = ffio_open_whitelist(&in, url, AVIO_FLAG_READ,
+                                   &s->interrupt_callback, NULL,
+                                   s->protocol_whitelist, s->protocol_blacklist)) < 0)
+        return ret;
+
+    read_chomp_line(in, line, sizeof(line));
+    if (strcmp(line, "#EXTM3U")) {
+        ret = AVERROR_INVALIDDATA;
+        goto fail;
+    }
+
+    vs->discontinuity = 0;
+    while (!avio_feof(in)) {
+        read_chomp_line(in, line, sizeof(line));
+        if (av_strstart(line, "#EXT-X-MEDIA-SEQUENCE:", &ptr)) {
+            int64_t tmp_sequence = strtoll(ptr, NULL, 10);
+            if (tmp_sequence < vs->sequence)
+              av_log(hls, AV_LOG_VERBOSE,
+                     "Found playlist sequence number was smaller """
+                     "than specified start sequence number: %"PRId64" < %"PRId64", "
+                     "omitting\n", tmp_sequence, hls->start_sequence);
+            else {
+              av_log(hls, AV_LOG_DEBUG, "Found playlist sequence number: %"PRId64"\n", tmp_sequence);
+              vs->sequence = tmp_sequence;
+            }
+        } else if (av_strstart(line, "#EXT-X-DISCONTINUITY", &ptr)) {
+            is_segment = 1;
+            vs->discontinuity = 1;
+        } else if (av_strstart(line, "#EXTINF:", &ptr)) {
+            is_segment = 1;
+            vs->duration = atof(ptr);
+        } else if (av_stristart(line, "#EXT-X-KEY:", &ptr)) {
+            ptr = av_stristr(line, "URI=\"");
+            if (ptr) {
+                ptr += strlen("URI=\"");
+                end = av_stristr(ptr, ",");
+                if (end) {
+                    av_strlcpy(hls->key_uri, ptr, end - ptr);
+                } else {
+                    av_strlcpy(hls->key_uri, ptr, sizeof(hls->key_uri));
+                }
+            }
+
+            ptr = av_stristr(line, "IV=0x");
+            if (ptr) {
+                ptr += strlen("IV=0x");
+                end = av_stristr(ptr, ",");
+                if (end) {
+                    av_strlcpy(hls->iv_string, ptr, end - ptr);
+                } else {
+                    av_strlcpy(hls->iv_string, ptr, sizeof(hls->iv_string));
+                }
+            }
+
+        } else if (av_strstart(line, "#", NULL)) {
+            continue;
+        } else if (line[0]) {
+            if (is_segment) {
+                is_segment = 0;
+                new_start_pos = avio_tell(vs->avf->pb);
+                vs->size = new_start_pos - vs->start_pos;
+                av_strlcpy(vs->avf->filename, line, sizeof(line));
+                ret = hls_append_segment(s, hls, vs, vs->duration, vs->start_pos, vs->size);
+                if (ret < 0)
+                    goto fail;
+                vs->start_pos = new_start_pos;
+            }
+        }
+    }
+
+fail:
+    avio_close(in);
+    return ret;
+}
+
+static void hls_free_segments(HLSSegment *p)
+{
+    HLSSegment *en;
 
     while(p) {
         en = p;
@@ -132,139 +1022,1027 @@ static void free_entries(HLSContext *hls)
     }
 }
 
-static int hls_window(AVFormatContext *s, int last)
+static void write_m3u8_head_block(HLSContext *hls, AVIOContext *out, int version,
+                                  int target_duration, int64_t sequence)
+{
+    avio_printf(out, "#EXTM3U\n");
+    avio_printf(out, "#EXT-X-VERSION:%d\n", version);
+    if (hls->allowcache == 0 || hls->allowcache == 1) {
+        avio_printf(out, "#EXT-X-ALLOW-CACHE:%s\n", hls->allowcache == 0 ? "NO" : "YES");
+    }
+    avio_printf(out, "#EXT-X-TARGETDURATION:%d\n", target_duration);
+    avio_printf(out, "#EXT-X-MEDIA-SEQUENCE:%"PRId64"\n", sequence);
+    av_log(hls, AV_LOG_VERBOSE, "EXT-X-MEDIA-SEQUENCE:%"PRId64"\n", sequence);
+}
+
+static void hls_rename_temp_file(AVFormatContext *s, AVFormatContext *oc)
+{
+    size_t len = strlen(oc->filename);
+    char final_filename[sizeof(oc->filename)];
+
+    av_strlcpy(final_filename, oc->filename, len);
+    final_filename[len-4] = '\0';
+    ff_rename(oc->filename, final_filename, s);
+    oc->filename[len-4] = '\0';
+}
+
+static int get_relative_url(const char *master_url, const char *media_url,
+                            char *rel_url, int rel_url_buf_size)
+{
+    char *p = NULL;
+    int base_len = -1;
+    p = strrchr(master_url, '/') ? strrchr(master_url, '/') :\
+            strrchr(master_url, '\\');
+    if (p) {
+        base_len = FFABS(p - master_url);
+        if (av_strncasecmp(master_url, media_url, base_len)) {
+            av_log(NULL, AV_LOG_WARNING, "Unable to find relative url\n");
+            return AVERROR(EINVAL);
+        }
+    }
+    av_strlcpy(rel_url, &(media_url[base_len + 1]), rel_url_buf_size);
+    return 0;
+}
+
+static int create_master_playlist(AVFormatContext *s,
+                                  VariantStream * const input_vs)
+{
+    HLSContext *hls = s->priv_data;
+    VariantStream *vs;
+    AVStream *vid_st, *aud_st;
+    AVIOContext *master_pb = 0;
+    AVDictionary *options = NULL;
+    unsigned int i, j;
+    int m3u8_name_size, ret, bandwidth;
+    char *m3U8_rel_name;
+
+    input_vs->m3u8_created = 1;
+    if (!hls->master_m3u8_created) {
+        /* For the first time, wait until all the media playlists are created */
+        for (i = 0; i < hls->nb_varstreams; i++)
+            if (!hls->var_streams[i].m3u8_created)
+                return 0;
+    } else {
+         /* Keep publishing the master playlist at the configured rate */
+        if (&hls->var_streams[0] != input_vs || !hls->master_publish_rate ||
+            input_vs->number % hls->master_publish_rate)
+            return 0;
+    }
+
+    if (hls->user_agent)
+      av_dict_set(&options, "user-agent", hls->user_agent, 0);
+
+    ret = s->io_open(s, &master_pb, hls->master_m3u8_url, AVIO_FLAG_WRITE,\
+                     &options);
+    av_dict_free(&options);
+    if (ret < 0) {
+        av_log(NULL, AV_LOG_ERROR, "Failed to open master play list file '%s'\n",
+                hls->master_m3u8_url);
+        goto fail;
+    }
+
+    avio_printf(master_pb, "#EXTM3U\n");
+    avio_printf(master_pb, "#EXT-X-VERSION:%d\n", hls->version);
+
+    /* For variant streams with video add #EXT-X-STREAM-INF tag with attributes*/
+    for (i = 0; i < hls->nb_varstreams; i++) {
+        vs = &(hls->var_streams[i]);
+
+        m3u8_name_size = strlen(vs->m3u8_name) + 1;
+        m3U8_rel_name = av_malloc(m3u8_name_size);
+        if (!m3U8_rel_name) {
+            ret = AVERROR(ENOMEM);
+            goto fail;
+        }
+        av_strlcpy(m3U8_rel_name, vs->m3u8_name, m3u8_name_size);
+        ret = get_relative_url(hls->master_m3u8_url, vs->m3u8_name,
+                               m3U8_rel_name, m3u8_name_size);
+        if (ret < 0) {
+            av_log(NULL, AV_LOG_ERROR, "Unable to find relative URL\n");
+            goto fail;
+        }
+
+        vid_st = NULL;
+        aud_st = NULL;
+        for (j = 0; j < vs->nb_streams; j++) {
+            if (vs->streams[j]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
+                vid_st = vs->streams[j];
+            else if (vs->streams[j]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO)
+                aud_st = vs->streams[j];
+        }
+
+        if (!vid_st && !aud_st) {
+            av_log(NULL, AV_LOG_WARNING, "Media stream not found\n");
+            continue;
+        }
+
+        bandwidth = 0;
+        if (vid_st)
+            bandwidth += vid_st->codecpar->bit_rate;
+        if (aud_st)
+            bandwidth += aud_st->codecpar->bit_rate;
+        bandwidth += bandwidth / 10;
+
+        if (!bandwidth) {
+            av_log(NULL, AV_LOG_WARNING,
+                    "Bandwidth info not available, set audio and video bitrates\n");
+            av_freep(&m3U8_rel_name);
+            continue;
+        }
+
+        avio_printf(master_pb, "#EXT-X-STREAM-INF:BANDWIDTH=%d", bandwidth);
+        if (vid_st && vid_st->codecpar->width > 0 && vid_st->codecpar->height > 0)
+            avio_printf(master_pb, ",RESOLUTION=%dx%d", vid_st->codecpar->width,
+                    vid_st->codecpar->height);
+        avio_printf(master_pb, "\n%s\n\n", m3U8_rel_name);
+
+        av_freep(&m3U8_rel_name);
+    }
+fail:
+    if(ret >=0)
+        hls->master_m3u8_created = 1;
+    av_freep(&m3U8_rel_name);
+    ff_format_io_close(s, &master_pb);
+    return ret;
+}
+
+static int hls_window(AVFormatContext *s, int last, VariantStream *vs)
 {
     HLSContext *hls = s->priv_data;
-    ListEntry *en;
-    int64_t target_duration = 0;
+    HLSSegment *en;
+    int target_duration = 0;
     int ret = 0;
     AVIOContext *out = NULL;
+    AVIOContext *sub_out = NULL;
     char temp_filename[1024];
-    int64_t sequence = FFMAX(hls->start_sequence, hls->sequence - hls->size);
+    int64_t sequence = FFMAX(hls->start_sequence, vs->sequence - vs->nb_entries);
+    const char *proto = avio_find_protocol_name(s->filename);
+    int use_rename = proto && !strcmp(proto, "file");
+    static unsigned warned_non_file;
+    char *key_uri = NULL;
+    char *iv_string = NULL;
+    AVDictionary *options = NULL;
+    double prog_date_time = vs->initial_prog_date_time;
+    int byterange_mode = (hls->flags & HLS_SINGLE_FILE) || (hls->max_seg_size > 0);
+
+    hls->version = 3;
+    if (byterange_mode) {
+        hls->version = 4;
+        sequence = 0;
+    }
+
+    if (hls->segment_type == SEGMENT_TYPE_FMP4) {
+        hls->version = 7;
+    }
 
-    snprintf(temp_filename, sizeof(temp_filename), "%s.tmp", s->filename);
-    if ((ret = s->io_open(s, &out, temp_filename, AVIO_FLAG_WRITE, NULL)) < 0)
+    if (!use_rename && !warned_non_file++)
+        av_log(s, AV_LOG_ERROR, "Cannot use rename on non file protocol, this may lead to races and temporary partial files\n");
+
+    set_http_options(s, &options, hls);
+    snprintf(temp_filename, sizeof(temp_filename), use_rename ? "%s.tmp" : "%s", vs->m3u8_name);
+    if ((ret = s->io_open(s, &out, temp_filename, AVIO_FLAG_WRITE, &options)) < 0)
         goto fail;
 
-    for (en = hls->list; en; en = en->next) {
-        if (target_duration < en->duration)
-            target_duration = en->duration;
+    for (en = vs->segments; en; en = en->next) {
+        if (target_duration <= en->duration)
+            target_duration = get_int_from_double(en->duration);
     }
 
-    avio_printf(out, "#EXTM3U\n");
-    avio_printf(out, "#EXT-X-VERSION:%d\n", hls->version);
-    if (hls->allowcache == 0 || hls->allowcache == 1) {
-        avio_printf(out, "#EXT-X-ALLOW-CACHE:%s\n", hls->allowcache == 0 ? "NO" : "YES");
+    vs->discontinuity_set = 0;
+    write_m3u8_head_block(hls, out, hls->version, target_duration, sequence);
+    if (hls->pl_type == PLAYLIST_TYPE_EVENT) {
+        avio_printf(out, "#EXT-X-PLAYLIST-TYPE:EVENT\n");
+    } else if (hls->pl_type == PLAYLIST_TYPE_VOD) {
+        avio_printf(out, "#EXT-X-PLAYLIST-TYPE:VOD\n");
     }
-    avio_printf(out, "#EXT-X-TARGETDURATION:%"PRId64"\n",
-                av_rescale_rnd(target_duration, 1, AV_TIME_BASE,
-                               AV_ROUND_UP));
-    avio_printf(out, "#EXT-X-MEDIA-SEQUENCE:%"PRId64"\n", sequence);
-
-    av_log(s, AV_LOG_VERBOSE, "EXT-X-MEDIA-SEQUENCE:%"PRId64"\n",
-           sequence);
 
-    for (en = hls->list; en; en = en->next) {
-        if (hls->version > 2)
-            avio_printf(out, "#EXTINF:%f\n",
-                        (double)en->duration / AV_TIME_BASE);
+    if((hls->flags & HLS_DISCONT_START) && sequence==hls->start_sequence && vs->discontinuity_set==0 ){
+        avio_printf(out, "#EXT-X-DISCONTINUITY\n");
+        vs->discontinuity_set = 1;
+    }
+    for (en = vs->segments; en; en = en->next) {
+        if ((hls->encrypt || hls->key_info_file) && (!key_uri || strcmp(en->key_uri, key_uri) ||
+                                    av_strcasecmp(en->iv_string, iv_string))) {
+            avio_printf(out, "#EXT-X-KEY:METHOD=AES-128,URI=\"%s\"", en->key_uri);
+            if (*en->iv_string)
+                avio_printf(out, ",IV=0x%s", en->iv_string);
+            avio_printf(out, "\n");
+            key_uri = en->key_uri;
+            iv_string = en->iv_string;
+        }
+
+        if (en->discont) {
+            avio_printf(out, "#EXT-X-DISCONTINUITY\n");
+        }
+
+        if ((hls->segment_type == SEGMENT_TYPE_FMP4) && (en == vs->segments)) {
+            avio_printf(out, "#EXT-X-MAP:URI=\"%s\"", vs->fmp4_init_filename);
+            if (hls->flags & HLS_SINGLE_FILE) {
+                avio_printf(out, ",BYTERANGE=\"%"PRId64"@%"PRId64"\"", en->size, en->pos);
+            }
+            avio_printf(out, "\n");
+        }
+        if (hls->flags & HLS_ROUND_DURATIONS)
+            avio_printf(out, "#EXTINF:%ld,\n",  lrint(en->duration));
         else
-            avio_printf(out, "#EXTINF:%"PRId64",\n",
-                        av_rescale(en->duration, 1, AV_TIME_BASE));
-        if (hls->baseurl)
-            avio_printf(out, "%s", hls->baseurl);
-        avio_printf(out, "%s\n", en->name);
+            avio_printf(out, "#EXTINF:%f,\n", en->duration);
+        if (byterange_mode)
+            avio_printf(out, "#EXT-X-BYTERANGE:%"PRId64"@%"PRId64"\n",
+                        en->size, en->pos);
+
+        if (hls->flags & HLS_PROGRAM_DATE_TIME) {
+            time_t tt, wrongsecs;
+            int milli;
+            struct tm *tm, tmpbuf;
+            char buf0[128], buf1[128];
+            tt = (int64_t)prog_date_time;
+            milli = av_clip(lrint(1000*(prog_date_time - tt)), 0, 999);
+            tm = localtime_r(&tt, &tmpbuf);
+            strftime(buf0, sizeof(buf0), "%Y-%m-%dT%H:%M:%S", tm);
+            if (!strftime(buf1, sizeof(buf1), "%z", tm) || buf1[1]<'0' ||buf1[1]>'2') {
+                int tz_min, dst = tm->tm_isdst;
+                tm = gmtime_r(&tt, &tmpbuf);
+                tm->tm_isdst = dst;
+                wrongsecs = mktime(tm);
+                tz_min = (abs(wrongsecs - tt) + 30) / 60;
+                snprintf(buf1, sizeof(buf1),
+                         "%c%02d%02d",
+                         wrongsecs <= tt ? '+' : '-',
+                         tz_min / 60,
+                         tz_min % 60);
+            }
+            avio_printf(out, "#EXT-X-PROGRAM-DATE-TIME:%s.%03d%s\n", buf0, milli, buf1);
+            prog_date_time += en->duration;
+        }
+        if (vs->baseurl)
+            avio_printf(out, "%s", vs->baseurl);
+        avio_printf(out, "%s\n", en->filename);
     }
 
-    if (last)
+    if (last && (hls->flags & HLS_OMIT_ENDLIST)==0)
         avio_printf(out, "#EXT-X-ENDLIST\n");
 
+    if( vs->vtt_m3u8_name ) {
+        if ((ret = s->io_open(s, &sub_out, vs->vtt_m3u8_name, AVIO_FLAG_WRITE, &options)) < 0)
+            goto fail;
+        write_m3u8_head_block(hls, sub_out, hls->version, target_duration, sequence);
+
+        for (en = vs->segments; en; en = en->next) {
+            avio_printf(sub_out, "#EXTINF:%f,\n", en->duration);
+            if (byterange_mode)
+                 avio_printf(sub_out, "#EXT-X-BYTERANGE:%"PRIi64"@%"PRIi64"\n",
+                         en->size, en->pos);
+            if (vs->baseurl)
+                avio_printf(sub_out, "%s", vs->baseurl);
+            avio_printf(sub_out, "%s\n", en->sub_filename);
+        }
+
+        if (last)
+            avio_printf(sub_out, "#EXT-X-ENDLIST\n");
+
+    }
+
 fail:
+    av_dict_free(&options);
     ff_format_io_close(s, &out);
-    if (ret >= 0)
-        ff_rename(temp_filename, s->filename);
+    ff_format_io_close(s, &sub_out);
+    if (ret >= 0 && use_rename)
+        ff_rename(temp_filename, vs->m3u8_name, s);
+
+    if (ret >= 0 && hls->master_pl_name)
+        if (create_master_playlist(s, vs) < 0)
+            av_log(s, AV_LOG_WARNING, "Master playlist creation failed\n");
+
     return ret;
 }
 
-static int hls_start(AVFormatContext *s)
+static int hls_start(AVFormatContext *s, VariantStream *vs)
 {
     HLSContext *c = s->priv_data;
-    AVFormatContext *oc = c->avf;
+    AVFormatContext *oc = vs->avf;
+    AVFormatContext *vtt_oc = vs->vtt_avf;
+    AVDictionary *options = NULL;
+    char *filename, iv_string[KEYSIZE*2 + 1];
     int err = 0;
 
-    if (av_get_frame_filename(oc->filename, sizeof(oc->filename),
-                              c->basename, c->wrap ? c->sequence % c->wrap : c->sequence) < 0)
-        return AVERROR(EINVAL);
-    c->number++;
+    if (c->flags & HLS_SINGLE_FILE) {
+        av_strlcpy(oc->filename, vs->basename,
+                   sizeof(oc->filename));
+        if (vs->vtt_basename)
+            av_strlcpy(vtt_oc->filename, vs->vtt_basename,
+                  sizeof(vtt_oc->filename));
+    } else if (c->max_seg_size > 0) {
+        if (replace_int_data_in_filename(oc->filename, sizeof(oc->filename),
+#if FF_API_HLS_WRAP
+            vs->basename, 'd', c->wrap ? vs->sequence % c->wrap : vs->sequence) < 1) {
+#else
+            vs->basename, 'd', vs->sequence) < 1) {
+#endif
+                av_log(oc, AV_LOG_ERROR, "Invalid segment filename template '%s', you can try to use -use_localtime 1 with it\n", vs->basename);
+                return AVERROR(EINVAL);
+        }
+    } else {
+        if (c->use_localtime) {
+            time_t now0;
+            struct tm *tm, tmpbuf;
+            time(&now0);
+            tm = localtime_r(&now0, &tmpbuf);
+            if (!strftime(oc->filename, sizeof(oc->filename), vs->basename, tm)) {
+                av_log(oc, AV_LOG_ERROR, "Could not get segment filename with use_localtime\n");
+                return AVERROR(EINVAL);
+            }
+
+            err = sls_flag_use_localtime_filename(oc, c, vs);
+            if (err < 0) {
+                return AVERROR(ENOMEM);
+            }
+
+            if (c->use_localtime_mkdir) {
+                const char *dir;
+                char *fn_copy = av_strdup(oc->filename);
+                if (!fn_copy) {
+                    return AVERROR(ENOMEM);
+                }
+                dir = av_dirname(fn_copy);
+                if (mkdir_p(dir) == -1 && errno != EEXIST) {
+                    av_log(oc, AV_LOG_ERROR, "Could not create directory %s with use_localtime_mkdir\n", dir);
+                    av_free(fn_copy);
+                    return AVERROR(errno);
+                }
+                av_free(fn_copy);
+            }
+        } else if (replace_int_data_in_filename(oc->filename, sizeof(oc->filename),
+#if FF_API_HLS_WRAP
+                   vs->basename, 'd', c->wrap ? vs->sequence % c->wrap : vs->sequence) < 1) {
+#else
+                   vs->basename, 'd', vs->sequence) < 1) {
+#endif
+            av_log(oc, AV_LOG_ERROR, "Invalid segment filename template '%s' you can try to use -use_localtime 1 with it\n", vs->basename);
+            return AVERROR(EINVAL);
+        }
+        if( vs->vtt_basename) {
+            if (replace_int_data_in_filename(vtt_oc->filename, sizeof(vtt_oc->filename),
+#if FF_API_HLS_WRAP
+                vs->vtt_basename, 'd', c->wrap ? vs->sequence % c->wrap : vs->sequence) < 1) {
+#else
+                vs->vtt_basename, 'd', vs->sequence) < 1) {
+#endif
+                av_log(vtt_oc, AV_LOG_ERROR, "Invalid segment filename template '%s'\n", vs->vtt_basename);
+                return AVERROR(EINVAL);
+            }
+       }
+    }
+    vs->number++;
 
-    if ((err = s->io_open(s, &oc->pb, oc->filename, AVIO_FLAG_WRITE, NULL)) < 0)
-        return err;
+    set_http_options(s, &options, c);
 
-    if (oc->oformat->priv_class && oc->priv_data)
-        av_opt_set(oc->priv_data, "mpegts_flags", "resend_headers", 0);
+    if (c->flags & HLS_TEMP_FILE) {
+        av_strlcat(oc->filename, ".tmp", sizeof(oc->filename));
+    }
+
+    if (c->key_info_file || c->encrypt) {
+        if (c->key_info_file && c->encrypt) {
+            av_log(s, AV_LOG_WARNING, "Cannot use both -hls_key_info_file and -hls_enc,"
+                  " will use -hls_key_info_file priority\n");
+        }
+
+        if (!c->encrypt_started || (c->flags & HLS_PERIODIC_REKEY)) {
+            if (c->key_info_file) {
+                if ((err = hls_encryption_start(s)) < 0)
+                    goto fail;
+            } else {
+                if ((err = do_encrypt(s, vs)) < 0)
+                    goto fail;
+            }
+            c->encrypt_started = 1;
+        }
+        if ((err = av_dict_set(&options, "encryption_key", c->key_string, 0))
+                < 0)
+            goto fail;
+        err = av_strlcpy(iv_string, c->iv_string, sizeof(iv_string));
+        if (!err)
+            snprintf(iv_string, sizeof(iv_string), "%032"PRIx64, vs->sequence);
+        if ((err = av_dict_set(&options, "encryption_iv", iv_string, 0)) < 0)
+           goto fail;
+
+        filename = av_asprintf("crypto:%s", oc->filename);
+        if (!filename) {
+            err = AVERROR(ENOMEM);
+            goto fail;
+        }
+        err = s->io_open(s, &oc->pb, filename, AVIO_FLAG_WRITE, &options);
+        av_free(filename);
+        av_dict_free(&options);
+        if (err < 0)
+            return err;
+    } else
+        if ((err = s->io_open(s, &oc->pb, oc->filename, AVIO_FLAG_WRITE, &options)) < 0)
+            goto fail;
+    if (vs->vtt_basename) {
+        set_http_options(s, &options, c);
+        if ((err = s->io_open(s, &vtt_oc->pb, vtt_oc->filename, AVIO_FLAG_WRITE, &options)) < 0)
+            goto fail;
+    }
+    av_dict_free(&options);
+
+    if (c->segment_type == SEGMENT_TYPE_FMP4 && !(c->flags & HLS_SINGLE_FILE)) {
+            write_styp(oc->pb);
+    } else {
+        /* We only require one PAT/PMT per segment. */
+        if (oc->oformat->priv_class && oc->priv_data) {
+            char period[21];
+
+            snprintf(period, sizeof(period), "%d", (INT_MAX / 2) - 1);
+
+            av_opt_set(oc->priv_data, "mpegts_flags", "resend_headers", 0);
+            av_opt_set(oc->priv_data, "sdt_period", period, 0);
+            av_opt_set(oc->priv_data, "pat_period", period, 0);
+        }
+    }
+
+    if (vs->vtt_basename) {
+        err = avformat_write_header(vtt_oc,NULL);
+        if (err < 0)
+            return err;
+    }
 
     return 0;
+fail:
+    av_dict_free(&options);
+
+    return err;
 }
 
-static int hls_write_header(AVFormatContext *s)
+static const char * get_default_pattern_localtime_fmt(AVFormatContext *s)
 {
+    char b[21];
+    time_t t = time(NULL);
+    struct tm *p, tmbuf;
     HLSContext *hls = s->priv_data;
-    int ret, i;
+
+    p = localtime_r(&t, &tmbuf);
+    // no %s support when strftime returned error or left format string unchanged
+    // also no %s support on MSVC, which invokes the invalid parameter handler on unsupported format strings, instead of returning an error
+    if (hls->segment_type == SEGMENT_TYPE_FMP4) {
+        return (HAVE_LIBC_MSVCRT || !strftime(b, sizeof(b), "%s", p) || !strcmp(b, "%s")) ? "-%Y%m%d%H%M%S.m4s" : "-%s.m4s";
+    }
+    return (HAVE_LIBC_MSVCRT || !strftime(b, sizeof(b), "%s", p) || !strcmp(b, "%s")) ? "-%Y%m%d%H%M%S.ts" : "-%s.ts";
+}
+
+static int format_name(char *name, int name_buf_len, int i)
+{
     char *p;
+    char extension[10] = {'\0'};
+
+    p = strrchr(name, '.');
+    if (p) {
+        av_strlcpy(extension, p, sizeof(extension));
+        *p = '\0';
+    }
+
+    snprintf(name + strlen(name), name_buf_len - strlen(name), POSTFIX_PATTERN, i);
+
+    if (strlen(extension))
+        av_strlcat(name, extension, name_buf_len);
+
+    return 0;
+}
+
+static int get_nth_codec_stream_index(AVFormatContext *s,
+                                      enum AVMediaType codec_type,
+                                      int stream_id)
+{
+    unsigned int stream_index, cnt;
+    if (stream_id < 0 || stream_id > s->nb_streams - 1)
+        return -1;
+    cnt = 0;
+    for (stream_index = 0; stream_index < s->nb_streams; stream_index++) {
+        if (s->streams[stream_index]->codecpar->codec_type != codec_type)
+            continue;
+        if (cnt == stream_id)
+            return stream_index;
+        cnt++;
+    }
+    return -1;
+}
+
+static int parse_variant_stream_mapstring(AVFormatContext *s)
+{
+    HLSContext *hls = s->priv_data;
+    VariantStream *vs;
+    int stream_index;
+    enum AVMediaType codec_type;
+    int nb_varstreams, nb_streams;
+    char *p, *q, *saveptr1, *saveptr2, *varstr, *keyval;
+    const char *val;
+
+    /**
+     * Expected format for var_stream_map string is as below:
+     * "a:0,v:0 a:1,v:1"
+     * This string specifies how to group the audio, video and subtitle streams
+     * into different variant streams. The variant stream groups are separated
+     * by space.
+     *
+     * a:, v:, s: are keys to specify audio, video and subtitle streams
+     * respectively. Allowed values are 0 to 9 digits (limited just based on
+     * practical usage)
+     *
+     */
+    p = av_strdup(hls->var_stream_map);
+    q = p;
+    while(av_strtok(q, " \t", &saveptr1)) {
+        q = NULL;
+        hls->nb_varstreams++;
+    }
+    av_freep(&p);
+
+    hls->var_streams = av_mallocz(sizeof(*hls->var_streams) * hls->nb_varstreams);
+    if (!hls->var_streams)
+        return AVERROR(ENOMEM);
+
+    p = hls->var_stream_map;
+    nb_varstreams = 0;
+    while (varstr = av_strtok(p, " \t", &saveptr1)) {
+        p = NULL;
+
+        if (nb_varstreams < hls->nb_varstreams)
+            vs = &(hls->var_streams[nb_varstreams++]);
+        else
+            return AVERROR(EINVAL);
+
+        q = varstr;
+        while (q < varstr + strlen(varstr)) {
+            if (!av_strncasecmp(q, "a:", 2) || !av_strncasecmp(q, "v:", 2) ||
+                !av_strncasecmp(q, "s:", 2))
+                vs->nb_streams++;
+            q++;
+        }
+        vs->streams = av_mallocz(sizeof(AVStream *) * vs->nb_streams);
+        if (!vs->streams)
+            return AVERROR(ENOMEM);
+
+        nb_streams = 0;
+        while (keyval = av_strtok(varstr, ",", &saveptr2)) {
+            varstr = NULL;
+
+            if (av_strstart(keyval, "v:", &val)) {
+                codec_type = AVMEDIA_TYPE_VIDEO;
+            } else if (av_strstart(keyval, "a:", &val)) {
+                codec_type = AVMEDIA_TYPE_AUDIO;
+            } else if (av_strstart(keyval, "s:", &val)) {
+                codec_type = AVMEDIA_TYPE_SUBTITLE;
+            } else {
+                av_log(s, AV_LOG_ERROR, "Invalid keyval %s\n", keyval);
+                return AVERROR(EINVAL);
+            }
+
+            stream_index = -1;
+            if (av_isdigit(*val))
+                stream_index = get_nth_codec_stream_index (s, codec_type,
+                                                           atoi(val));
+
+            if (stream_index >= 0 && nb_streams < vs->nb_streams) {
+                vs->streams[nb_streams++] = s->streams[stream_index];
+            } else {
+                av_log(s, AV_LOG_ERROR, "Unable to map stream at %s\n", keyval);
+                return AVERROR(EINVAL);
+            }
+        }
+    }
+    av_log(s, AV_LOG_DEBUG, "Number of variant streams %d\n",
+            hls->nb_varstreams);
+
+    return 0;
+}
+
+static int update_variant_stream_info(AVFormatContext *s) {
+    HLSContext *hls = s->priv_data;
+    unsigned int i;
+
+    if (hls->var_stream_map) {
+        return parse_variant_stream_mapstring(s);
+    } else {
+        //By default, a single variant stream with all the codec streams is created
+        hls->nb_varstreams = 1;
+        hls->var_streams = av_mallocz(sizeof(*hls->var_streams) *
+                                             hls->nb_varstreams);
+        if (!hls->var_streams)
+            return AVERROR(ENOMEM);
+
+        hls->var_streams[0].nb_streams = s->nb_streams;
+        hls->var_streams[0].streams = av_mallocz(sizeof(AVStream *) *
+                                            hls->var_streams[0].nb_streams);
+        if (!hls->var_streams[0].streams)
+            return AVERROR(ENOMEM);
+
+        for (i = 0; i < s->nb_streams; i++)
+            hls->var_streams[0].streams[i] = s->streams[i];
+    }
+    return 0;
+}
+
+static int update_master_pl_info(AVFormatContext *s) {
+    HLSContext *hls = s->priv_data;
+    int m3u8_name_size, ret;
+    char *p;
+
+    m3u8_name_size = strlen(s->filename) + strlen(hls->master_pl_name) + 1;
+    hls->master_m3u8_url = av_malloc(m3u8_name_size);
+    if (!hls->master_m3u8_url) {
+        ret = AVERROR(ENOMEM);
+        return ret;
+    }
+
+    av_strlcpy(hls->master_m3u8_url, s->filename, m3u8_name_size);
+    p = strrchr(hls->master_m3u8_url, '/') ?
+            strrchr(hls->master_m3u8_url, '/') :
+            strrchr(hls->master_m3u8_url, '\\');
+    if (p) {
+        *(p + 1) = '\0';
+        av_strlcat(hls->master_m3u8_url, hls->master_pl_name, m3u8_name_size);
+    } else {
+        av_strlcpy(hls->master_m3u8_url, hls->master_pl_name, m3u8_name_size);
+    }
+
+    return 0;
+}
+
+static int hls_write_header(AVFormatContext *s)
+{
+    HLSContext *hls = s->priv_data;
+    int ret, i, j;
+    char *p = NULL;
     const char *pattern = "%d.ts";
-    int basename_size = strlen(s->filename) + strlen(pattern) + 1;
+    const char *pattern_localtime_fmt = get_default_pattern_localtime_fmt(s);
+    const char *vtt_pattern = "%d.vtt";
+    AVDictionary *options = NULL;
+    int basename_size = 0;
+    int vtt_basename_size = 0, m3u8_name_size = 0;
+    VariantStream *vs = NULL;
+    int fmp4_init_filename_len = strlen(hls->fmp4_init_filename) + 1;
+
+    ret = update_variant_stream_info(s);
+    if (ret < 0) {
+        av_log(s, AV_LOG_ERROR, "Variant stream info update failed with status %x\n",
+                ret);
+        goto fail;
+    }
+
+    //TODO: Updates needed to encryption functionality with periodic re-key when more than one variant streams are present
+    if (hls->nb_varstreams > 1 && hls->flags & HLS_PERIODIC_REKEY) {
+        ret = AVERROR(EINVAL);
+        av_log(s, AV_LOG_ERROR, "Periodic re-key not supported when more than one variant streams are present\n");
+        goto fail;
+    }
+
+    if (hls->master_pl_name) {
+        ret = update_master_pl_info(s);
+        if (ret < 0) {
+            av_log(s, AV_LOG_ERROR, "Master stream info update failed with status %x\n",
+                    ret);
+            goto fail;
+        }
+    }
+
+    if (hls->segment_type == SEGMENT_TYPE_FMP4) {
+        pattern = "%d.m4s";
+    }
+    if ((hls->start_sequence_source_type == HLS_START_SEQUENCE_AS_SECONDS_SINCE_EPOCH) ||
+        (hls->start_sequence_source_type == HLS_START_SEQUENCE_AS_FORMATTED_DATETIME)) {
+        time_t t = time(NULL); // we will need it in either case
+        if (hls->start_sequence_source_type == HLS_START_SEQUENCE_AS_SECONDS_SINCE_EPOCH) {
+            hls->start_sequence = (int64_t)t;
+        } else if (hls->start_sequence_source_type == HLS_START_SEQUENCE_AS_FORMATTED_DATETIME) {
+            char b[15];
+            struct tm *p, tmbuf;
+            if (!(p = localtime_r(&t, &tmbuf)))
+                return AVERROR(ENOMEM);
+            if (!strftime(b, sizeof(b), "%Y%m%d%H%M%S", p))
+                return AVERROR(ENOMEM);
+            hls->start_sequence = strtoll(b, NULL, 10);
+        }
+        av_log(hls, AV_LOG_DEBUG, "start_number evaluated to %"PRId64"\n", hls->start_sequence);
+    }
+
+    for (i = 0; i < hls->nb_varstreams; i++) {
+        vs = &hls->var_streams[i];
+
+    vs->sequence       = hls->start_sequence;
+    hls->recording_time = (hls->init_time ? hls->init_time : hls->time) * AV_TIME_BASE;
+    vs->start_pts      = AV_NOPTS_VALUE;
+    vs->current_segment_final_filename_fmt[0] = '\0';
 
-    hls->sequence       = hls->start_sequence;
-    hls->recording_time = hls->time * AV_TIME_BASE;
-    hls->start_pts      = AV_NOPTS_VALUE;
+    if (hls->flags & HLS_PROGRAM_DATE_TIME) {
+        time_t now0;
+        time(&now0);
+        vs->initial_prog_date_time = now0;
+    }
+
+    if (hls->format_options_str) {
+        ret = av_dict_parse_string(&hls->format_options, hls->format_options_str, "=", ":", 0);
+        if (ret < 0) {
+            av_log(s, AV_LOG_ERROR, "Could not parse format options list '%s'\n", hls->format_options_str);
+            goto fail;
+        }
+    }
 
-    for (i = 0; i < s->nb_streams; i++)
-        hls->has_video +=
-            s->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO;
+    for (j = 0; j < vs->nb_streams; j++) {
+        vs->has_video +=
+            vs->streams[j]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO;
+        vs->has_subtitle +=
+            vs->streams[j]->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE;
+    }
 
-    if (hls->has_video > 1)
+    if (vs->has_video > 1)
         av_log(s, AV_LOG_WARNING,
                "More than a single video stream present, "
                "expect issues decoding it.\n");
 
-    hls->oformat = av_guess_format("mpegts", NULL, NULL);
+    if (hls->segment_type == SEGMENT_TYPE_FMP4) {
+        vs->oformat = av_guess_format("mp4", NULL, NULL);
+    } else {
+        vs->oformat = av_guess_format("mpegts", NULL, NULL);
+    }
 
-    if (!hls->oformat) {
+    if (!vs->oformat) {
         ret = AVERROR_MUXER_NOT_FOUND;
         goto fail;
     }
 
-    hls->basename = av_malloc(basename_size);
+    if(vs->has_subtitle) {
+        vs->vtt_oformat = av_guess_format("webvtt", NULL, NULL);
+        if (!vs->oformat) {
+            ret = AVERROR_MUXER_NOT_FOUND;
+            goto fail;
+        }
+    }
+
+    if (hls->segment_filename) {
+        basename_size = strlen(hls->segment_filename) + 1;
+        if (hls->nb_varstreams > 1) {
+            basename_size += strlen(POSTFIX_PATTERN);
+        }
+        vs->basename = av_malloc(basename_size);
+        if (!vs->basename) {
+            ret = AVERROR(ENOMEM);
+            goto fail;
+        }
+
+        av_strlcpy(vs->basename, hls->segment_filename, basename_size);
+    } else {
+        if (hls->flags & HLS_SINGLE_FILE) {
+            if (hls->segment_type == SEGMENT_TYPE_FMP4) {
+                pattern = ".m4s";
+            } else {
+                pattern = ".ts";
+            }
+        }
+
+        if (hls->use_localtime) {
+            basename_size = strlen(s->filename) + strlen(pattern_localtime_fmt) + 1;
+        } else {
+            basename_size = strlen(s->filename) + strlen(pattern) + 1;
+        }
+
+        if (hls->nb_varstreams > 1) {
+            basename_size += strlen(POSTFIX_PATTERN);
+        }
+
+        vs->basename = av_malloc(basename_size);
+        if (!vs->basename) {
+            ret = AVERROR(ENOMEM);
+            goto fail;
+        }
+
+        av_strlcpy(vs->basename, s->filename, basename_size);
+
+        p = strrchr(vs->basename, '.');
+        if (p)
+            *p = '\0';
+        if (hls->use_localtime) {
+            av_strlcat(vs->basename, pattern_localtime_fmt, basename_size);
+        } else {
+            av_strlcat(vs->basename, pattern, basename_size);
+        }
+    }
+
+    m3u8_name_size = strlen(s->filename) + 1;
+    if (hls->nb_varstreams > 1) {
+        m3u8_name_size += strlen(POSTFIX_PATTERN);
+    }
 
-    if (!hls->basename) {
+    vs->m3u8_name = av_malloc(m3u8_name_size);
+    if (!vs->m3u8_name ) {
         ret = AVERROR(ENOMEM);
         goto fail;
     }
 
-    strcpy(hls->basename, s->filename);
+    av_strlcpy(vs->m3u8_name, s->filename, m3u8_name_size);
 
-    p = strrchr(hls->basename, '.');
+    if (hls->nb_varstreams > 1) {
+        ret = format_name(vs->basename, basename_size, i);
+        if (ret < 0)
+             goto fail;
+        ret = format_name(vs->m3u8_name, m3u8_name_size, i);
+        if (ret < 0)
+             goto fail;
+    }
 
-    if (p)
-        *p = '\0';
+    if (hls->segment_type == SEGMENT_TYPE_FMP4) {
+        if (hls->nb_varstreams > 1)
+            fmp4_init_filename_len += strlen(POSTFIX_PATTERN);
+        vs->fmp4_init_filename = av_malloc(fmp4_init_filename_len);
+        if (!vs->fmp4_init_filename ) {
+            ret = AVERROR(ENOMEM);
+            goto fail;
+        }
+        av_strlcpy(vs->fmp4_init_filename, hls->fmp4_init_filename,
+                fmp4_init_filename_len);
+        if (hls->nb_varstreams > 1) {
+            ret = format_name(vs->fmp4_init_filename, fmp4_init_filename_len, i);
+            if (ret < 0)
+                 goto fail;
+        }
+
+        if (av_strcasecmp(hls->fmp4_init_filename, "init.mp4")) {
+            fmp4_init_filename_len = strlen(vs->fmp4_init_filename) + 1;
+            vs->base_output_dirname = av_malloc(fmp4_init_filename_len);
+            if (!vs->base_output_dirname) {
+                ret = AVERROR(ENOMEM);
+                goto fail;
+            }
+            av_strlcpy(vs->base_output_dirname, vs->fmp4_init_filename,
+                    fmp4_init_filename_len);
+        } else {
+            fmp4_init_filename_len = strlen(vs->m3u8_name) +
+                                         strlen(vs->fmp4_init_filename) + 1;
+
+            vs->base_output_dirname = av_malloc(fmp4_init_filename_len);
+            if (!vs->base_output_dirname) {
+                ret = AVERROR(ENOMEM);
+                goto fail;
+            }
+
+            av_strlcpy(vs->base_output_dirname, vs->m3u8_name,
+                    fmp4_init_filename_len);
+            p = strrchr(vs->base_output_dirname, '/');
+            if (p) {
+                *(p + 1) = '\0';
+                av_strlcat(vs->base_output_dirname, vs->fmp4_init_filename,
+                        fmp4_init_filename_len);
+            } else {
+                av_strlcpy(vs->base_output_dirname, vs->fmp4_init_filename,
+                        fmp4_init_filename_len);
+            }
+        }
+    }
 
-    av_strlcat(hls->basename, pattern, basename_size);
+    if (!hls->use_localtime) {
+        ret = sls_flag_check_duration_size_index(hls);
+        if (ret < 0) {
+             goto fail;
+        }
+    } else {
+        ret = sls_flag_check_duration_size(hls, vs);
+        if (ret < 0) {
+             goto fail;
+        }
+    }
+    if(vs->has_subtitle) {
+
+        if (hls->flags & HLS_SINGLE_FILE)
+            vtt_pattern = ".vtt";
+        vtt_basename_size = strlen(s->filename) + strlen(vtt_pattern) + 1;
+        if (hls->nb_varstreams > 1) {
+            vtt_basename_size += strlen(POSTFIX_PATTERN);
+        }
+
+        vs->vtt_basename = av_malloc(vtt_basename_size);
+        if (!vs->vtt_basename) {
+            ret = AVERROR(ENOMEM);
+            goto fail;
+        }
+        vs->vtt_m3u8_name = av_malloc(vtt_basename_size);
+        if (!vs->vtt_m3u8_name ) {
+            ret = AVERROR(ENOMEM);
+            goto fail;
+        }
+        av_strlcpy(vs->vtt_basename, s->filename, vtt_basename_size);
+        p = strrchr(vs->vtt_basename, '.');
+        if (p)
+            *p = '\0';
+
+        if( hls->subtitle_filename ) {
+            strcpy(vs->vtt_m3u8_name, hls->subtitle_filename);
+        } else {
+            strcpy(vs->vtt_m3u8_name, vs->vtt_basename);
+            av_strlcat(vs->vtt_m3u8_name, "_vtt.m3u8", vtt_basename_size);
+        }
+        av_strlcat(vs->vtt_basename, vtt_pattern, vtt_basename_size);
+
+        if (hls->nb_varstreams > 1) {
+            ret= format_name(vs->vtt_basename, vtt_basename_size, i);
+            if (ret < 0)
+                 goto fail;
+            ret = format_name(vs->vtt_m3u8_name, vtt_basename_size, i);
+            if (ret < 0)
+                 goto fail;
+        }
+    }
 
-    if ((ret = hls_mux_init(s)) < 0)
-        goto fail;
+    if (hls->baseurl) {
+        int baseurl_len;
+        baseurl_len = strlen(hls->baseurl);
+        vs->baseurl = av_malloc(baseurl_len);
+        if (!vs->baseurl) {
+            ret = AVERROR(ENOMEM);
+            goto fail;
+        }
+        av_strlcpy(vs->baseurl, hls->baseurl, baseurl_len);
+    }
+
+    if ((hls->flags & HLS_SINGLE_FILE) && (hls->segment_type == SEGMENT_TYPE_FMP4)) {
+        vs->fmp4_init_filename  = av_strdup(vs->basename);
+        if (!vs->fmp4_init_filename) {
+            ret = AVERROR(ENOMEM);
+            goto fail;
+        }
+    }
 
-    if ((ret = hls_start(s)) < 0)
+    if ((ret = hls_mux_init(s, vs)) < 0)
         goto fail;
 
-    if ((ret = avformat_write_header(hls->avf, NULL)) < 0)
-        return ret;
+    if (hls->flags & HLS_APPEND_LIST) {
+        parse_playlist(s, vs->m3u8_name, vs);
+        vs->discontinuity = 1;
+        if (hls->init_time > 0) {
+            av_log(s, AV_LOG_WARNING, "append_list mode does not support hls_init_time,"
+                   " hls_init_time value will have no effect\n");
+            hls->init_time = 0;
+            hls->recording_time = hls->time * AV_TIME_BASE;
+        }
+    }
 
+    if (hls->segment_type != SEGMENT_TYPE_FMP4 || hls->flags & HLS_SINGLE_FILE) {
+        if ((ret = hls_start(s, vs)) < 0)
+            goto fail;
+    }
 
+    av_dict_copy(&options, hls->format_options, 0);
+    ret = avformat_write_header(vs->avf, &options);
+    if (av_dict_count(options)) {
+        av_log(s, AV_LOG_ERROR, "Some of provided format options in '%s' are not recognized\n", hls->format_options_str);
+        ret = AVERROR(EINVAL);
+        av_dict_free(&options);
+        goto fail;
+    }
+    av_dict_free(&options);
+    //av_assert0(s->nb_streams == hls->avf->nb_streams);
+    for (j = 0; j < vs->nb_streams; j++) {
+        AVStream *inner_st;
+        AVStream *outer_st = vs->streams[j];
+
+        if (hls->max_seg_size > 0) {
+            if ((outer_st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) &&
+                (outer_st->codecpar->bit_rate > hls->max_seg_size)) {
+                av_log(s, AV_LOG_WARNING, "Your video bitrate is bigger than hls_segment_size, "
+                       "(%"PRId64 " > %"PRId64 "), the result maybe not be what you want.",
+                       outer_st->codecpar->bit_rate, hls->max_seg_size);
+            }
+        }
+
+        if (outer_st->codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE)
+            inner_st = vs->avf->streams[j];
+        else if (vs->vtt_avf)
+            inner_st = vs->vtt_avf->streams[0];
+        else {
+            /* We have a subtitle stream, when the user does not want one */
+            inner_st = NULL;
+            continue;
+        }
+        avpriv_set_pts_info(outer_st, inner_st->pts_wrap_bits, inner_st->time_base.num, inner_st->time_base.den);
+    }
+    }
 fail:
-    if (ret) {
-        av_free(hls->basename);
-        if (hls->avf)
-            avformat_free_context(hls->avf);
+
+    if (ret < 0) {
+        av_freep(&hls->key_basename);
+        for (i = 0; i < hls->nb_varstreams && hls->var_streams; i++) {
+            vs = &hls->var_streams[i];
+            av_freep(&vs->basename);
+            av_freep(&vs->vtt_basename);
+            av_freep(&vs->fmp4_init_filename);
+            av_freep(&vs->m3u8_name);
+            av_freep(&vs->vtt_m3u8_name);
+            av_freep(&vs->streams);
+            av_freep(&vs->baseurl);
+            if (vs->avf)
+                avformat_free_context(vs->avf);
+            if (vs->vtt_avf)
+                avformat_free_context(vs->vtt_avf);
+        }
+        av_freep(&hls->var_streams);
+        av_freep(&hls->master_m3u8_url);
     }
     return ret;
 }
@@ -272,49 +2050,165 @@ fail:
 static int hls_write_packet(AVFormatContext *s, AVPacket *pkt)
 {
     HLSContext *hls = s->priv_data;
-    AVFormatContext *oc = hls->avf;
+    AVFormatContext *oc = NULL;
     AVStream *st = s->streams[pkt->stream_index];
-    int64_t end_pts = hls->recording_time * hls->number;
-    int64_t pts     = av_rescale_q(pkt->pts, st->time_base, AV_TIME_BASE_Q);
-    int ret, can_split = 1;
-
-    if (hls->start_pts == AV_NOPTS_VALUE) {
-        hls->start_pts = pts;
-        hls->end_pts   = pts;
+    int64_t end_pts = 0;
+    int is_ref_pkt = 1;
+    int ret = 0, can_split = 1, i, j;
+    int stream_index = 0;
+    int range_length = 0;
+    uint8_t *buffer = NULL;
+    VariantStream *vs = NULL;
+
+    for (i = 0; i < hls->nb_varstreams; i++) {
+        vs = &hls->var_streams[i];
+        for (j = 0; j < vs->nb_streams; j++) {
+            if (vs->streams[j] == st) {
+                if( st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE ) {
+                    oc = vs->vtt_avf;
+                    stream_index = 0;
+                } else {
+                    oc = vs->avf;
+                    stream_index = j;
+                }
+                break;
+            }
+        }
+
+        if (oc)
+            break;
     }
 
-    if (hls->has_video) {
-        can_split = st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
-                    pkt->flags & AV_PKT_FLAG_KEY;
+    if (!oc) {
+        av_log(s, AV_LOG_ERROR, "Unable to find mapping variant stream\n");
+        return AVERROR(ENOMEM);
     }
-    if (pkt->pts == AV_NOPTS_VALUE)
-        can_split = 0;
-    else
-        hls->duration = pts - hls->end_pts;
 
-    if (can_split && pts - hls->start_pts >= end_pts) {
-        ret = append_entry(hls, hls->duration);
-        if (ret)
-            return ret;
+    end_pts = hls->recording_time * vs->number;
 
-        hls->end_pts = pts;
-        hls->duration = 0;
+    if (vs->sequence - vs->nb_entries > hls->start_sequence && hls->init_time > 0) {
+        /* reset end_pts, hls->recording_time at end of the init hls list */
+        int init_list_dur = hls->init_time * vs->nb_entries * AV_TIME_BASE;
+        int after_init_list_dur = (vs->sequence - vs->nb_entries ) * hls->time * AV_TIME_BASE;
+        hls->recording_time = hls->time * AV_TIME_BASE;
+        end_pts = init_list_dur + after_init_list_dur ;
+    }
 
-        av_write_frame(oc, NULL); /* Flush any buffered data */
-        ff_format_io_close(s, &oc->pb);
+    if (vs->start_pts == AV_NOPTS_VALUE) {
+        vs->start_pts = pkt->pts;
+        vs->end_pts   = pkt->pts;
+    }
 
-        ret = hls_start(s);
+    if (vs->has_video) {
+        can_split = st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
+                    ((pkt->flags & AV_PKT_FLAG_KEY) || (hls->flags & HLS_SPLIT_BY_TIME));
+        is_ref_pkt = st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO;
+    }
+    if (pkt->pts == AV_NOPTS_VALUE)
+        is_ref_pkt = can_split = 0;
+
+    if (is_ref_pkt) {
+        if (vs->new_start) {
+            vs->new_start = 0;
+            vs->duration = (double)(pkt->pts - vs->end_pts)
+                                       * st->time_base.num / st->time_base.den;
+            vs->dpp = (double)(pkt->duration) * st->time_base.num / st->time_base.den;
+        } else {
+            if (pkt->duration) {
+                vs->duration += (double)(pkt->duration) * st->time_base.num / st->time_base.den;
+            } else {
+                av_log(s, AV_LOG_WARNING, "pkt->duration = 0, maybe the hls segment duration will not precise\n");
+                vs->duration = (double)(pkt->pts - vs->end_pts) * st->time_base.num / st->time_base.den;
+            }
+        }
 
-        if (ret)
-            return ret;
+    }
 
-        oc = hls->avf;
+    if (vs->packets_written && can_split && av_compare_ts(pkt->pts - vs->start_pts, st->time_base,
+                                   end_pts, AV_TIME_BASE_Q) >= 0) {
+        int64_t new_start_pos;
+        char *old_filename = av_strdup(vs->avf->filename);
+        int byterange_mode = (hls->flags & HLS_SINGLE_FILE) || (hls->max_seg_size > 0);
 
-        if ((ret = hls_window(s, 0)) < 0)
+        if (!old_filename) {
+            return AVERROR(ENOMEM);
+        }
+
+        av_write_frame(vs->avf, NULL); /* Flush any buffered data */
+
+        new_start_pos = avio_tell(vs->avf->pb);
+        vs->size = new_start_pos - vs->start_pos;
+
+        if (!byterange_mode) {
+            if (hls->segment_type == SEGMENT_TYPE_FMP4 && !vs->init_range_length) {
+                avio_flush(oc->pb);
+                range_length = avio_close_dyn_buf(oc->pb, &buffer);
+                avio_write(vs->out, buffer, range_length);
+                vs->init_range_length = range_length;
+                avio_open_dyn_buf(&oc->pb);
+                vs->packets_written = 0;
+                ff_format_io_close(s, &vs->out);
+            } else {
+                ff_format_io_close(s, &oc->pb);
+            }
+            if (vs->vtt_avf) {
+                ff_format_io_close(s, &vs->vtt_avf->pb);
+            }
+        }
+        if ((hls->flags & HLS_TEMP_FILE) && oc->filename[0]) {
+            if (!(hls->flags & HLS_SINGLE_FILE) || (hls->max_seg_size <= 0))
+                if ((vs->avf->oformat->priv_class && vs->avf->priv_data) && hls->segment_type != SEGMENT_TYPE_FMP4)
+                    av_opt_set(vs->avf->priv_data, "mpegts_flags", "resend_headers", 0);
+            hls_rename_temp_file(s, oc);
+        }
+
+        if (vs->fmp4_init_mode) {
+            vs->number--;
+        }
+
+        if (!vs->fmp4_init_mode || byterange_mode)
+            ret = hls_append_segment(s, hls, vs, vs->duration, vs->start_pos, vs->size);
+        vs->start_pos = new_start_pos;
+        if (ret < 0) {
+            av_free(old_filename);
             return ret;
+        }
+
+        vs->end_pts = pkt->pts;
+        vs->duration = 0;
+
+        vs->fmp4_init_mode = 0;
+        if (hls->flags & HLS_SINGLE_FILE) {
+            vs->number++;
+        } else if (hls->max_seg_size > 0) {
+            if (vs->start_pos >= hls->max_seg_size) {
+                vs->sequence++;
+                sls_flag_file_rename(hls, vs, old_filename);
+                ret = hls_start(s, vs);
+                vs->start_pos = 0;
+                /* When split segment by byte, the duration is short than hls_time,
+                 * so it is not enough one segment duration as hls_time, */
+                vs->number--;
+            }
+            vs->number++;
+        } else {
+            sls_flag_file_rename(hls, vs, old_filename);
+            ret = hls_start(s, vs);
+        }
+        av_free(old_filename);
+
+        if (ret < 0) {
+            return ret;
+        }
+
+        if (!vs->fmp4_init_mode || byterange_mode)
+            if ((ret = hls_window(s, 0, vs)) < 0) {
+                return ret;
+            }
     }
 
-    ret = ff_write_chained(oc, pkt->stream_index, pkt, s);
+    vs->packets_written++;
+    ret = ff_write_chained(oc, stream_index, pkt, s, 0);
 
     return ret;
 }
@@ -322,29 +2216,127 @@ static int hls_write_packet(AVFormatContext *s, AVPacket *pkt)
 static int hls_write_trailer(struct AVFormatContext *s)
 {
     HLSContext *hls = s->priv_data;
-    AVFormatContext *oc = hls->avf;
+    AVFormatContext *oc = NULL;
+    AVFormatContext *vtt_oc = NULL;
+    char *old_filename = NULL;
+    int i;
+    VariantStream *vs = NULL;
+
+    for (i = 0; i < hls->nb_varstreams; i++) {
+        vs = &hls->var_streams[i];
+
+    oc = vs->avf;
+    vtt_oc = vs->vtt_avf;
+    old_filename = av_strdup(vs->avf->filename);
+
+    if (!old_filename) {
+        return AVERROR(ENOMEM);
+    }
+
 
     av_write_trailer(oc);
-    ff_format_io_close(s, &oc->pb);
+    if (oc->pb) {
+        vs->size = avio_tell(vs->avf->pb) - vs->start_pos;
+        ff_format_io_close(s, &oc->pb);
+
+        if ((hls->flags & HLS_TEMP_FILE) && oc->filename[0]) {
+            hls_rename_temp_file(s, oc);
+        }
+
+        /* after av_write_trailer, then duration + 1 duration per packet */
+        hls_append_segment(s, hls, vs, vs->duration + vs->dpp, vs->start_pos, vs->size);
+    }
+
+    sls_flag_file_rename(hls, vs, old_filename);
+
+    if (vtt_oc) {
+        if (vtt_oc->pb)
+            av_write_trailer(vtt_oc);
+        vs->size = avio_tell(vs->vtt_avf->pb) - vs->start_pos;
+        ff_format_io_close(s, &vtt_oc->pb);
+    }
+    av_freep(&vs->basename);
+    av_freep(&vs->base_output_dirname);
     avformat_free_context(oc);
-    av_free(hls->basename);
-    append_entry(hls, hls->duration);
-    hls_window(s, 1);
 
-    free_entries(hls);
+    vs->avf = NULL;
+    hls_window(s, 1, vs);
+
+    av_freep(&vs->fmp4_init_filename);
+    if (vtt_oc) {
+        av_freep(&vs->vtt_basename);
+        av_freep(&vs->vtt_m3u8_name);
+        avformat_free_context(vtt_oc);
+    }
+
+    hls_free_segments(vs->segments);
+    hls_free_segments(vs->old_segments);
+    av_free(old_filename);
+    av_freep(&vs->m3u8_name);
+    av_freep(&vs->streams);
+    av_freep(&vs->baseurl);
+    }
+
+    av_freep(&hls->key_basename);
+    av_freep(&hls->var_streams);
+    av_freep(&hls->master_m3u8_url);
     return 0;
 }
 
 #define OFFSET(x) offsetof(HLSContext, x)
 #define E AV_OPT_FLAG_ENCODING_PARAM
 static const AVOption options[] = {
-    {"start_number",  "first number in the sequence",            OFFSET(start_sequence),AV_OPT_TYPE_INT64,  {.i64 = 0},     0, INT64_MAX, E},
-    {"hls_time",      "segment length in seconds",               OFFSET(time),    AV_OPT_TYPE_FLOAT,  {.dbl = 2},     0, FLT_MAX, E},
-    {"hls_list_size", "maximum number of playlist entries",      OFFSET(size),    AV_OPT_TYPE_INT,    {.i64 = 5},     0, INT_MAX, E},
-    {"hls_wrap",      "number after which the index wraps",      OFFSET(wrap),    AV_OPT_TYPE_INT,    {.i64 = 0},     0, INT_MAX, E},
+    {"start_number",  "set first number in the sequence",        OFFSET(start_sequence),AV_OPT_TYPE_INT64,  {.i64 = 0},     0, INT64_MAX, E},
+    {"hls_time",      "set segment length in seconds",           OFFSET(time),    AV_OPT_TYPE_FLOAT,  {.dbl = 2},     0, FLT_MAX, E},
+    {"hls_init_time", "set segment length in seconds at init list",           OFFSET(init_time),    AV_OPT_TYPE_FLOAT,  {.dbl = 0},     0, FLT_MAX, E},
+    {"hls_list_size", "set maximum number of playlist entries",  OFFSET(max_nb_segments),    AV_OPT_TYPE_INT,    {.i64 = 5},     0, INT_MAX, E},
+    {"hls_ts_options","set hls mpegts list of options for the container format used for hls", OFFSET(format_options_str), AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,    E},
+    {"hls_vtt_options","set hls vtt list of options for the container format used for hls", OFFSET(vtt_format_options_str), AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,    E},
+#if FF_API_HLS_WRAP
+    {"hls_wrap",      "set number after which the index wraps (will be deprecated)",  OFFSET(wrap),    AV_OPT_TYPE_INT,    {.i64 = 0},     0, INT_MAX, E},
+#endif
     {"hls_allow_cache", "explicitly set whether the client MAY (1) or MUST NOT (0) cache media segments", OFFSET(allowcache), AV_OPT_TYPE_INT, {.i64 = -1}, INT_MIN, INT_MAX, E},
     {"hls_base_url",  "url to prepend to each playlist entry",   OFFSET(baseurl), AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,       E},
-    {"hls_version",   "protocol version",                        OFFSET(version), AV_OPT_TYPE_INT,    {.i64 = 3},     2, 3, E},
+    {"hls_segment_filename", "filename template for segment files", OFFSET(segment_filename),   AV_OPT_TYPE_STRING, {.str = NULL},            0,       0,         E},
+    {"hls_segment_size", "maximum size per segment file, (in bytes)",  OFFSET(max_seg_size),    AV_OPT_TYPE_INT,    {.i64 = 0},               0,       INT_MAX,   E},
+    {"hls_key_info_file",    "file with key URI and key file path", OFFSET(key_info_file),      AV_OPT_TYPE_STRING, {.str = NULL},            0,       0,         E},
+    {"hls_enc",    "enable AES128 encryption support", OFFSET(encrypt),      AV_OPT_TYPE_BOOL, {.i64 = 0},            0,       1,         E},
+    {"hls_enc_key",    "hex-coded 16 byte key to encrypt the segments", OFFSET(key),      AV_OPT_TYPE_STRING, .flags = E},
+    {"hls_enc_key_url",    "url to access the key to decrypt the segments", OFFSET(key_url),      AV_OPT_TYPE_STRING, {.str = NULL},            0,       0,         E},
+    {"hls_enc_iv",    "hex-coded 16 byte initialization vector", OFFSET(iv),      AV_OPT_TYPE_STRING, .flags = E},
+    {"hls_subtitle_path",     "set path of hls subtitles", OFFSET(subtitle_filename), AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,    E},
+    {"hls_segment_type",     "set hls segment files type", OFFSET(segment_type), AV_OPT_TYPE_INT, {.i64 = SEGMENT_TYPE_MPEGTS }, 0, SEGMENT_TYPE_FMP4, E, "segment_type"},
+    {"mpegts",   "make segment file to mpegts files in m3u8", 0, AV_OPT_TYPE_CONST, {.i64 = SEGMENT_TYPE_MPEGTS }, 0, UINT_MAX,   E, "segment_type"},
+    {"fmp4",   "make segment file to fragment mp4 files in m3u8", 0, AV_OPT_TYPE_CONST, {.i64 = SEGMENT_TYPE_FMP4 }, 0, UINT_MAX,   E, "segment_type"},
+    {"hls_fmp4_init_filename", "set fragment mp4 file init filename", OFFSET(fmp4_init_filename),   AV_OPT_TYPE_STRING, {.str = "init.mp4"},            0,       0,         E},
+    {"hls_flags",     "set flags affecting HLS playlist and media file generation", OFFSET(flags), AV_OPT_TYPE_FLAGS, {.i64 = 0 }, 0, UINT_MAX, E, "flags"},
+    {"single_file",   "generate a single media file indexed with byte ranges", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_SINGLE_FILE }, 0, UINT_MAX,   E, "flags"},
+    {"temp_file", "write segment to temporary file and rename when complete", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_TEMP_FILE }, 0, UINT_MAX,   E, "flags"},
+    {"delete_segments", "delete segment files that are no longer part of the playlist", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_DELETE_SEGMENTS }, 0, UINT_MAX,   E, "flags"},
+    {"round_durations", "round durations in m3u8 to whole numbers", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_ROUND_DURATIONS }, 0, UINT_MAX,   E, "flags"},
+    {"discont_start", "start the playlist with a discontinuity tag", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_DISCONT_START }, 0, UINT_MAX,   E, "flags"},
+    {"omit_endlist", "Do not append an endlist when ending stream", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_OMIT_ENDLIST }, 0, UINT_MAX,   E, "flags"},
+    {"split_by_time", "split the hls segment by time which user set by hls_time", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_SPLIT_BY_TIME }, 0, UINT_MAX,   E, "flags"},
+    {"append_list", "append the new segments into old hls segment list", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_APPEND_LIST }, 0, UINT_MAX,   E, "flags"},
+    {"program_date_time", "add EXT-X-PROGRAM-DATE-TIME", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_PROGRAM_DATE_TIME }, 0, UINT_MAX,   E, "flags"},
+    {"second_level_segment_index", "include segment index in segment filenames when use_localtime", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_SECOND_LEVEL_SEGMENT_INDEX }, 0, UINT_MAX,   E, "flags"},
+    {"second_level_segment_duration", "include segment duration in segment filenames when use_localtime", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_SECOND_LEVEL_SEGMENT_DURATION }, 0, UINT_MAX,   E, "flags"},
+    {"second_level_segment_size", "include segment size in segment filenames when use_localtime", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_SECOND_LEVEL_SEGMENT_SIZE }, 0, UINT_MAX,   E, "flags"},
+    {"periodic_rekey", "reload keyinfo file periodically for re-keying", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_PERIODIC_REKEY }, 0, UINT_MAX,   E, "flags"},
+    {"use_localtime", "set filename expansion with strftime at segment creation", OFFSET(use_localtime), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, E },
+    {"use_localtime_mkdir", "create last directory component in strftime-generated filename", OFFSET(use_localtime_mkdir), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, E },
+    {"hls_playlist_type", "set the HLS playlist type", OFFSET(pl_type), AV_OPT_TYPE_INT, {.i64 = PLAYLIST_TYPE_NONE }, 0, PLAYLIST_TYPE_NB-1, E, "pl_type" },
+    {"event", "EVENT playlist", 0, AV_OPT_TYPE_CONST, {.i64 = PLAYLIST_TYPE_EVENT }, INT_MIN, INT_MAX, E, "pl_type" },
+    {"vod", "VOD playlist", 0, AV_OPT_TYPE_CONST, {.i64 = PLAYLIST_TYPE_VOD }, INT_MIN, INT_MAX, E, "pl_type" },
+    {"method", "set the HTTP method(default: PUT)", OFFSET(method), AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,    E},
+    {"hls_start_number_source", "set source of first number in sequence", OFFSET(start_sequence_source_type), AV_OPT_TYPE_INT, {.i64 = HLS_START_SEQUENCE_AS_START_NUMBER }, 0, HLS_START_SEQUENCE_AS_FORMATTED_DATETIME, E, "start_sequence_source_type" },
+    {"generic", "start_number value (default)", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_START_SEQUENCE_AS_START_NUMBER }, INT_MIN, INT_MAX, E, "start_sequence_source_type" },
+    {"epoch", "seconds since epoch", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_START_SEQUENCE_AS_SECONDS_SINCE_EPOCH }, INT_MIN, INT_MAX, E, "start_sequence_source_type" },
+    {"datetime", "current datetime as YYYYMMDDhhmmss", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_START_SEQUENCE_AS_FORMATTED_DATETIME }, INT_MIN, INT_MAX, E, "start_sequence_source_type" },
+    {"http_user_agent", "override User-Agent field in HTTP header", OFFSET(user_agent), AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,    E},
+    {"var_stream_map", "Variant stream map string", OFFSET(var_stream_map), AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,    E},
+    {"master_pl_name", "Create HLS master playlist with this name", OFFSET(master_pl_name), AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,    E},
+    {"master_pl_publish_rate", "Publish master play list every after this many segment intervals", OFFSET(master_publish_rate), AV_OPT_TYPE_INT, {.i64 = 0}, 0, UINT_MAX, E},
     { NULL },
 };
 
@@ -363,7 +2355,8 @@ AVOutputFormat ff_hls_muxer = {
     .priv_data_size = sizeof(HLSContext),
     .audio_codec    = AV_CODEC_ID_AAC,
     .video_codec    = AV_CODEC_ID_H264,
-    .flags          = AVFMT_NOFILE | AVFMT_ALLOW_FLUSH,
+    .subtitle_codec = AV_CODEC_ID_WEBVTT,
+    .flags          = AVFMT_NOFILE | AVFMT_GLOBALHEADER | AVFMT_ALLOW_FLUSH,
     .write_header   = hls_write_header,
     .write_packet   = hls_write_packet,
     .write_trailer  = hls_write_trailer,