/* * Copyright (c) 2015 Martin Storsjo * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "config.h" #include "libavutil/intreadwrite.h" #include "libavutil/mathematics.h" #include "libavutil/md5.h" #include "libavutil/mem.h" #include "libavformat/avformat.h" #if HAVE_UNISTD_H #include #endif #if !HAVE_GETOPT #include "compat/getopt.c" #endif #define HASH_SIZE 16 static const uint8_t h264_extradata[] = { 0x01, 0x4d, 0x40, 0x1e, 0xff, 0xe1, 0x00, 0x02, 0x67, 0x4d, 0x01, 0x00, 0x02, 0x68, 0xef }; static const uint8_t aac_extradata[] = { 0x12, 0x10 }; static const char *format = "mp4"; AVFormatContext *ctx; uint8_t iobuf[32768]; AVDictionary *opts; int write_file; const char *cur_name; FILE* out; int out_size; struct AVMD5* md5; uint8_t hash[HASH_SIZE]; AVPacket *pkt; AVStream *video_st, *audio_st, *id3_st; int64_t audio_dts, video_dts; int bframes; int64_t duration; int64_t audio_duration; int frames; int gop_size; int64_t next_p_pts; enum AVPictureType last_picture; int skip_write; int skip_write_audio; int clear_duration; int force_iobuf_size; int do_interleave; int fake_pkt_duration; int num_warnings; int check_faults; static void count_warnings(void *avcl, int level, const char *fmt, va_list vl) { if (level == AV_LOG_WARNING) num_warnings++; } static void init_count_warnings(void) { av_log_set_callback(count_warnings); num_warnings = 0; } static void reset_count_warnings(void) { av_log_set_callback(av_log_default_callback); } static int io_write(void *opaque, const uint8_t *buf, int size) { out_size += size; av_md5_update(md5, buf, size); if (out) fwrite(buf, 1, size, out); return size; } static int io_write_data_type(void *opaque, const uint8_t *buf, int size, enum AVIODataMarkerType type, int64_t time) { char timebuf[30], content[5] = { 0 }; const char *str; switch (type) { case AVIO_DATA_MARKER_HEADER: str = "header"; break; case AVIO_DATA_MARKER_SYNC_POINT: str = "sync"; break; case AVIO_DATA_MARKER_BOUNDARY_POINT: str = "boundary"; break; case AVIO_DATA_MARKER_UNKNOWN: str = "unknown"; break; case AVIO_DATA_MARKER_TRAILER: str = "trailer"; break; default: str = "unknown"; break; } if (time == AV_NOPTS_VALUE) snprintf(timebuf, sizeof(timebuf), "nopts"); else snprintf(timebuf, sizeof(timebuf), "%"PRId64, time); // There can be multiple header/trailer callbacks, only log the box type // for header at out_size == 0 if (type != AVIO_DATA_MARKER_UNKNOWN && type != AVIO_DATA_MARKER_TRAILER && (type != AVIO_DATA_MARKER_HEADER || out_size == 0) && size >= 8) memcpy(content, &buf[4], 4); else snprintf(content, sizeof(content), "-"); printf("write_data len %d, time %s, type %s atom %s\n", size, timebuf, str, content); return io_write(opaque, buf, size); } static void init_out(const char *name) { char buf[100]; cur_name = name; snprintf(buf, sizeof(buf), "%s.%s", cur_name, format); av_md5_init(md5); if (write_file) { out = fopen(buf, "wb"); if (!out) perror(buf); } out_size = 0; } static void close_out(void) { int i; av_md5_final(md5, hash); for (i = 0; i < HASH_SIZE; i++) printf("%02x", hash[i]); printf(" %d %s\n", out_size, cur_name); if (out) fclose(out); out = NULL; } static void check_func(int value, int line, const char *msg, ...) { if (!value) { va_list ap; va_start(ap, msg); printf("%d: ", line); vprintf(msg, ap); printf("\n"); check_faults++; va_end(ap); } } #define check(value, ...) check_func(value, __LINE__, __VA_ARGS__) static void init_fps(int bf, int audio_preroll, int fps, int id3) { AVStream *st; int iobuf_size = force_iobuf_size ? force_iobuf_size : sizeof(iobuf); ctx = avformat_alloc_context(); if (!ctx) exit(1); ctx->oformat = av_guess_format(format, NULL, NULL); if (!ctx->oformat) exit(1); ctx->pb = avio_alloc_context(iobuf, iobuf_size, 1, NULL, NULL, io_write, NULL); if (!ctx->pb) exit(1); ctx->pb->write_data_type = io_write_data_type; ctx->flags |= AVFMT_FLAG_BITEXACT; st = avformat_new_stream(ctx, NULL); if (!st) exit(1); st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; st->codecpar->codec_id = AV_CODEC_ID_H264; st->codecpar->width = 640; st->codecpar->height = 480; st->time_base.num = 1; st->time_base.den = 30; st->codecpar->extradata_size = sizeof(h264_extradata); st->codecpar->extradata = av_mallocz(st->codecpar->extradata_size + AV_INPUT_BUFFER_PADDING_SIZE); if (!st->codecpar->extradata) exit(1); memcpy(st->codecpar->extradata, h264_extradata, sizeof(h264_extradata)); video_st = st; st = avformat_new_stream(ctx, NULL); if (!st) exit(1); st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; st->codecpar->codec_id = AV_CODEC_ID_AAC; st->codecpar->sample_rate = 44100; st->codecpar->frame_size = 1024; st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO; st->time_base.num = 1; st->time_base.den = 44100; st->codecpar->extradata_size = sizeof(aac_extradata); st->codecpar->extradata = av_mallocz(st->codecpar->extradata_size + AV_INPUT_BUFFER_PADDING_SIZE); if (!st->codecpar->extradata) exit(1); memcpy(st->codecpar->extradata, aac_extradata, sizeof(aac_extradata)); audio_st = st; if (id3) { st = avformat_new_stream(ctx, NULL); if (!st) exit(1); st->codecpar->codec_type = AVMEDIA_TYPE_DATA; st->codecpar->codec_id = AV_CODEC_ID_TIMED_ID3; st->time_base.num = 1; st->time_base.den = 1000; id3_st = st; } if (avformat_write_header(ctx, &opts) < 0) exit(1); av_dict_free(&opts); frames = 0; gop_size = 30; duration = video_st->time_base.den / fps; audio_duration = (long long)audio_st->codecpar->frame_size * audio_st->time_base.den / audio_st->codecpar->sample_rate; if (audio_preroll) audio_preroll = 2 * audio_duration; bframes = bf; video_dts = bframes ? -duration : 0; audio_dts = -audio_preroll; } static void init(int bf, int audio_preroll) { init_fps(bf, audio_preroll, 30, 0); } static void mux_frames(int n, int c) { int end_frames = frames + n; while (1) { uint8_t pktdata[8] = { 0 }; av_packet_unref(pkt); if (av_compare_ts(audio_dts, audio_st->time_base, video_dts, video_st->time_base) < 0) { pkt->dts = pkt->pts = audio_dts; pkt->stream_index = 1; pkt->duration = audio_duration; pkt->flags |= AV_PKT_FLAG_KEY; audio_dts += audio_duration; } else { if (frames == end_frames) break; pkt->dts = video_dts; pkt->stream_index = 0; pkt->duration = duration; if ((frames % gop_size) == 0) { pkt->flags |= AV_PKT_FLAG_KEY; last_picture = AV_PICTURE_TYPE_I; pkt->pts = pkt->dts + duration; video_dts = pkt->pts; } else { if (last_picture == AV_PICTURE_TYPE_P) { last_picture = AV_PICTURE_TYPE_B; pkt->pts = pkt->dts; video_dts = next_p_pts; } else { last_picture = AV_PICTURE_TYPE_P; if (((frames + 1) % gop_size) == 0) { pkt->pts = pkt->dts + duration; video_dts = pkt->pts; } else { next_p_pts = pkt->pts = pkt->dts + 2 * duration; video_dts += duration; } } } if (!bframes) pkt->pts = pkt->dts; if (fake_pkt_duration) pkt->duration = fake_pkt_duration; frames++; } if (clear_duration) pkt->duration = 0; AV_WB32(pktdata + 4, pkt->pts); pkt->data = pktdata; pkt->size = 8; if (skip_write) continue; if (skip_write_audio && pkt->stream_index == 1) continue; if (c) { pkt->pts += (1LL<<32); pkt->dts += (1LL<<32); } if (do_interleave) av_interleaved_write_frame(ctx, pkt); else av_write_frame(ctx, pkt); } } static void mux_id3(void) { uint8_t pktdata[8] = { 0 }; av_packet_unref(pkt); pkt->dts = pkt->pts = av_rescale_q(video_dts + (bframes ? duration : 0), video_st->time_base, id3_st->time_base); pkt->stream_index = id3_st->index; pkt->duration = 0; AV_WB32(pktdata + 4, pkt->pts); pkt->data = pktdata; pkt->size = 8; av_write_frame(ctx, pkt); } static void mux_gops(int n) { mux_frames(gop_size * n, 0); } static void skip_gops(int n) { skip_write = 1; mux_gops(n); skip_write = 0; } static void signal_init_ts(void) { av_packet_unref(pkt); pkt->stream_index = 0; pkt->dts = video_dts; pkt->pts = 0; av_write_frame(ctx, pkt); pkt->stream_index = 1; pkt->dts = pkt->pts = audio_dts; av_write_frame(ctx, pkt); } static void finish(void) { av_write_trailer(ctx); avio_context_free(&ctx->pb); avformat_free_context(ctx); ctx = NULL; } static void help(void) { printf("movenc-test [-w]\n" "-w write output into files\n"); } int main(int argc, char **argv) { int c; uint8_t header[HASH_SIZE]; uint8_t content[HASH_SIZE]; int empty_moov_pos; int prev_pos; for (;;) { c = getopt(argc, argv, "wh"); if (c == -1) break; switch (c) { case 'w': write_file = 1; break; default: case 'h': help(); return 0; } } md5 = av_md5_alloc(); if (!md5) return 1; pkt = av_packet_alloc(); if (!pkt) { av_free(md5); return 1; } // Write a fragmented file with an initial moov that actually contains some // samples. One moov+mdat with 1 second of data and one moof+mdat with 1 // second of data. init_out("non-empty-moov"); av_dict_set(&opts, "movflags", "+frag_keyframe", 0); init(0, 0); mux_gops(2); finish(); close_out(); // Write a similar file, but with B-frames and audio preroll, handled // via an edit list. init_out("non-empty-moov-elst"); av_dict_set(&opts, "movflags", "+frag_keyframe", 0); av_dict_set(&opts, "use_editlist", "1", 0); init(1, 1); mux_gops(2); finish(); close_out(); // Use B-frames but no audio-preroll, but without an edit list. // Due to avoid_negative_ts == AVFMT_AVOID_NEG_TS_MAKE_ZERO, the dts // of the first audio packet is > 0, but it is set to zero since edit // lists aren't used, increasing the duration of the first packet instead. init_out("non-empty-moov-no-elst"); av_dict_set(&opts, "movflags", "+frag_keyframe", 0); av_dict_set(&opts, "use_editlist", "0", 0); init(1, 0); mux_gops(2); finish(); close_out(); format = "ismv"; // Write an ISMV, with B-frames and audio preroll. init_out("ismv"); av_dict_set(&opts, "movflags", "+frag_keyframe", 0); init(1, 1); mux_gops(2); finish(); close_out(); format = "mp4"; // An initial moov that doesn't contain any samples, followed by two // moof+mdat pairs. init_out("empty-moov"); av_dict_set(&opts, "movflags", "+frag_keyframe+empty_moov", 0); av_dict_set(&opts, "use_editlist", "0", 0); init(0, 0); mux_gops(2); finish(); close_out(); memcpy(content, hash, HASH_SIZE); // Similar to the previous one, but with input that doesn't start at // pts/dts 0. avoid_negative_ts behaves in the same way as // in non-empty-moov-no-elst above. init_count_warnings(); init_out("empty-moov-no-elst"); av_dict_set(&opts, "movflags", "+frag_keyframe+empty_moov", 0); init(1, 0); mux_gops(2); finish(); close_out(); reset_count_warnings(); check(num_warnings == 0, "Unexpected warnings printed"); // Same as the previous one, but disable avoid_negative_ts (which // would require using an edit list, but with empty_moov, one can't // write a sensible edit list, when the start timestamps aren't known). // This should trigger a warning - we check that the warning is produced. init_count_warnings(); init_out("empty-moov-no-elst-no-adjust"); av_dict_set(&opts, "movflags", "+frag_keyframe+empty_moov", 0); av_dict_set(&opts, "avoid_negative_ts", "disabled", 0); init(1, 0); mux_gops(2); finish(); close_out(); reset_count_warnings(); check(num_warnings > 0, "No warnings printed for unhandled start offset"); // Verify that delay_moov produces the same as empty_moov for // simple input init_out("delay-moov"); av_dict_set(&opts, "movflags", "+frag_keyframe+delay_moov", 0); av_dict_set(&opts, "use_editlist", "0", 0); init(0, 0); mux_gops(2); finish(); close_out(); check(!memcmp(hash, content, HASH_SIZE), "delay_moov differs from empty_moov"); // Test writing content that requires an edit list using delay_moov init_out("delay-moov-elst"); av_dict_set(&opts, "movflags", "+frag_keyframe+delay_moov", 0); init(1, 1); mux_gops(2); finish(); close_out(); // Test writing a file with one track lacking packets, with delay_moov. skip_write_audio = 1; init_out("delay-moov-empty-track"); av_dict_set(&opts, "movflags", "+frag_keyframe+delay_moov", 0); init(0, 0); mux_gops(2); // The automatic flushing shouldn't output anything, since we're still // waiting for data for some tracks check(out_size == 0, "delay_moov flushed prematurely"); // When closed (or manually flushed), all the written data should still // be output. finish(); close_out(); check(out_size > 0, "delay_moov didn't output anything"); // Check that manually flushing still outputs things as expected. This // produces two fragments, while the one above produces only one. init_out("delay-moov-empty-track-flush"); av_dict_set(&opts, "movflags", "+frag_custom+delay_moov", 0); init(0, 0); mux_gops(1); av_write_frame(ctx, NULL); // Force writing the moov check(out_size > 0, "No moov written"); av_write_frame(ctx, NULL); mux_gops(1); av_write_frame(ctx, NULL); finish(); close_out(); skip_write_audio = 0; // Verify that the header written by delay_moov when manually flushed // is identical to the one by empty_moov. init_out("empty-moov-header"); av_dict_set(&opts, "movflags", "+frag_keyframe+empty_moov", 0); av_dict_set(&opts, "use_editlist", "0", 0); init(0, 0); close_out(); memcpy(header, hash, HASH_SIZE); init_out("empty-moov-content"); mux_gops(2); // Written 2 seconds of content, with an automatic flush after 1 second. check(out_size > 0, "No automatic flush?"); empty_moov_pos = prev_pos = out_size; // Manually flush the second fragment av_write_frame(ctx, NULL); check(out_size > prev_pos, "No second fragment flushed?"); prev_pos = out_size; // Check that an extra flush doesn't output any more data av_write_frame(ctx, NULL); check(out_size == prev_pos, "More data written?"); close_out(); memcpy(content, hash, HASH_SIZE); // Ignore the trailer written here finish(); init_out("delay-moov-header"); av_dict_set(&opts, "movflags", "+frag_custom+delay_moov", 0); av_dict_set(&opts, "use_editlist", "0", 0); init(0, 0); check(out_size == 0, "Output written during init with delay_moov"); mux_gops(1); // Write 1 second of content av_write_frame(ctx, NULL); // Force writing the moov close_out(); check(!memcmp(hash, header, HASH_SIZE), "delay_moov header differs from empty_moov"); init_out("delay-moov-content"); av_write_frame(ctx, NULL); // Flush the first fragment check(out_size == empty_moov_pos, "Manually flushed content differs from automatically flushed, %d vs %d", out_size, empty_moov_pos); mux_gops(1); // Write the rest of the content av_write_frame(ctx, NULL); // Flush the second fragment close_out(); check(!memcmp(hash, content, HASH_SIZE), "delay_moov content differs from empty_moov"); finish(); // Verify that we can produce an identical second fragment without // writing the first one. First write the reference fragments that // we want to reproduce. av_dict_set(&opts, "movflags", "+frag_custom+empty_moov+dash", 0); init(0, 0); mux_gops(1); av_write_frame(ctx, NULL); // Output the first fragment init_out("empty-moov-second-frag"); mux_gops(1); av_write_frame(ctx, NULL); // Output the second fragment close_out(); memcpy(content, hash, HASH_SIZE); finish(); // Produce the same second fragment without actually writing the first // one before. av_dict_set(&opts, "movflags", "+frag_custom+empty_moov+dash+frag_discont", 0); av_dict_set(&opts, "fragment_index", "2", 0); av_dict_set(&opts, "avoid_negative_ts", "disabled", 0); av_dict_set(&opts, "use_editlist", "0", 0); init(0, 0); skip_gops(1); init_out("empty-moov-second-frag-discont"); mux_gops(1); av_write_frame(ctx, NULL); // Output the second fragment close_out(); check(!memcmp(hash, content, HASH_SIZE), "discontinuously written fragment differs"); finish(); // Produce the same thing by using delay_moov, which requires a slightly // different call sequence. av_dict_set(&opts, "movflags", "+frag_custom+delay_moov+dash+frag_discont", 0); av_dict_set(&opts, "fragment_index", "2", 0); init(0, 0); skip_gops(1); mux_gops(1); av_write_frame(ctx, NULL); // Output the moov init_out("delay-moov-second-frag-discont"); av_write_frame(ctx, NULL); // Output the second fragment close_out(); check(!memcmp(hash, content, HASH_SIZE), "discontinuously written fragment differs"); finish(); // Test discontinuously written fragments with B-frames (where the // assumption of starting at pts=0 works) but not with audio preroll // (which can't be guessed). av_dict_set(&opts, "movflags", "+frag_custom+delay_moov+dash", 0); init(1, 0); mux_gops(1); init_out("delay-moov-elst-init"); av_write_frame(ctx, NULL); // Output the moov close_out(); memcpy(header, hash, HASH_SIZE); av_write_frame(ctx, NULL); // Output the first fragment init_out("delay-moov-elst-second-frag"); mux_gops(1); av_write_frame(ctx, NULL); // Output the second fragment close_out(); memcpy(content, hash, HASH_SIZE); finish(); av_dict_set(&opts, "movflags", "+frag_custom+delay_moov+dash+frag_discont", 0); av_dict_set(&opts, "fragment_index", "2", 0); init(1, 0); skip_gops(1); mux_gops(1); // Write the second fragment init_out("delay-moov-elst-init-discont"); av_write_frame(ctx, NULL); // Output the moov close_out(); check(!memcmp(hash, header, HASH_SIZE), "discontinuously written header differs"); init_out("delay-moov-elst-second-frag-discont"); av_write_frame(ctx, NULL); // Output the second fragment close_out(); check(!memcmp(hash, content, HASH_SIZE), "discontinuously written fragment differs"); finish(); // Test discontinuously written fragments with B-frames and audio preroll, // properly signaled. av_dict_set(&opts, "movflags", "+frag_custom+delay_moov+dash", 0); init(1, 1); mux_gops(1); init_out("delay-moov-elst-signal-init"); av_write_frame(ctx, NULL); // Output the moov close_out(); memcpy(header, hash, HASH_SIZE); av_write_frame(ctx, NULL); // Output the first fragment init_out("delay-moov-elst-signal-second-frag"); mux_gops(1); av_write_frame(ctx, NULL); // Output the second fragment close_out(); memcpy(content, hash, HASH_SIZE); finish(); av_dict_set(&opts, "movflags", "+frag_custom+delay_moov+dash+frag_discont", 0); av_dict_set(&opts, "fragment_index", "2", 0); init(1, 1); signal_init_ts(); skip_gops(1); mux_gops(1); // Write the second fragment init_out("delay-moov-elst-signal-init-discont"); av_write_frame(ctx, NULL); // Output the moov close_out(); check(!memcmp(hash, header, HASH_SIZE), "discontinuously written header differs"); init_out("delay-moov-elst-signal-second-frag-discont"); av_write_frame(ctx, NULL); // Output the second fragment close_out(); check(!memcmp(hash, content, HASH_SIZE), "discontinuously written fragment differs"); finish(); // Test muxing discontinuous fragments with very large (> (1<<31)) timestamps. av_dict_set(&opts, "movflags", "+frag_custom+delay_moov+dash+frag_discont", 0); av_dict_set(&opts, "fragment_index", "2", 0); init(1, 1); signal_init_ts(); skip_gops(1); mux_frames(gop_size, 1); // Write the second fragment init_out("delay-moov-elst-signal-init-discont-largets"); av_write_frame(ctx, NULL); // Output the moov close_out(); init_out("delay-moov-elst-signal-second-frag-discont-largets"); av_write_frame(ctx, NULL); // Output the second fragment close_out(); finish(); // Test VFR content, with sidx atoms (which declare the pts duration // of a fragment, forcing overriding the start pts of the next one). // Here, the fragment duration in pts is significantly different from // the duration in dts. The video stream starts at dts=-10,pts=0, and // the second fragment starts at dts=155,pts=156. The trun duration sum // of the first fragment is 165, which also is written as // baseMediaDecodeTime in the tfdt in the second fragment. The sidx for // the first fragment says earliest_presentation_time = 0 and // subsegment_duration = 156, which also matches the sidx in the second // fragment. For the audio stream, the pts and dts durations also don't // match - the input stream starts at pts=-2048, but that part is excluded // by the edit list. init_out("vfr"); av_dict_set(&opts, "movflags", "+frag_keyframe+delay_moov+dash", 0); init_fps(1, 1, 3, 0); mux_frames(gop_size/2, 0); duration /= 10; mux_frames(gop_size/2, 0); mux_gops(1); finish(); close_out(); // Test VFR content, with cleared duration fields. In these cases, // the muxer must guess the duration of the last packet of each // fragment. As long as the framerate doesn't vary (too much) at the // fragment edge, it works just fine. Additionally, when automatically // cutting fragments, the muxer already know the timestamps of the next // packet for one stream (in most cases the video stream), avoiding // having to use guesses for that one. init_count_warnings(); clear_duration = 1; init_out("vfr-noduration"); av_dict_set(&opts, "movflags", "+frag_keyframe+delay_moov+dash", 0); init_fps(1, 1, 3, 0); mux_frames(gop_size/2, 0); duration /= 10; mux_frames(gop_size/2, 0); mux_gops(1); finish(); close_out(); clear_duration = 0; reset_count_warnings(); check(num_warnings > 0, "No warnings printed for filled in durations"); // Test with an IO buffer size that is too small to hold a full fragment; // this will cause write_data_type to be called with the type unknown. force_iobuf_size = 1500; init_out("large_frag"); av_dict_set(&opts, "movflags", "+frag_keyframe+delay_moov", 0); init_fps(1, 1, 3, 0); mux_gops(2); finish(); close_out(); force_iobuf_size = 0; // Test VFR content with bframes with interleaving. // Here, using av_interleaved_write_frame allows the muxer to get the // fragment end durations right. We always set the packet duration to // the expected, but we simulate dropped frames at one point. do_interleave = 1; init_out("vfr-noduration-interleave"); av_dict_set(&opts, "movflags", "+frag_keyframe+delay_moov", 0); av_dict_set(&opts, "frag_duration", "650000", 0); init_fps(1, 1, 30, 0); mux_frames(gop_size/2, 0); // Pretend that the packet duration is the normal, even if // we actually skip a bunch of frames. (I.e., simulate that // we don't know of the framedrop in advance.) fake_pkt_duration = duration; duration *= 10; mux_frames(1, 0); fake_pkt_duration = 0; duration /= 10; mux_frames(gop_size/2 - 1, 0); mux_gops(1); finish(); close_out(); clear_duration = 0; do_interleave = 0; // Write a fragmented file with b-frames and audio preroll, // with negative cts values, removing the edit list for the // video track. init_out("delay-moov-elst-neg-cts"); av_dict_set(&opts, "movflags", "+frag_keyframe+delay_moov+negative_cts_offsets", 0); init(1, 1); mux_gops(2); finish(); close_out(); // Write a fragmented file with b-frames without audio preroll, // with negative cts values, avoiding any edit lists, allowing // to use empty_moov instead of delay_moov. init_out("empty-moov-neg-cts"); av_dict_set(&opts, "movflags", "+frag_keyframe+empty_moov+negative_cts_offsets", 0); init(1, 0); mux_gops(2); finish(); close_out(); // Write a manually fragmented file, with timed ID3 packets at the head // of each fragment. init_out("emsg"); av_dict_set(&opts, "movflags", "+frag_custom+cmaf", 0); init_fps(1, 0, 30, 1); mux_id3(); mux_gops(2); av_write_frame(ctx, NULL); // Flush fragment. mux_id3(); mux_gops(2); finish(); close_out(); av_free(md5); av_packet_free(&pkt); return check_faults > 0 ? 1 : 0; }