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FFmpeg/libavformat/tests/movenc.c
Marvin Scholz c6f4e10111 avformat: do not use AVIO_FLAG_* with avio_alloc_context 
The documentation states that here 0 should be used for read-only and
1 for a writable buffer. AVIO_FLAG_WRITE however is 2, while it works
due to the way the flag is handled internally, it is still wrong
according to the documentation.

Additionally it makes it seem as if the AVIO_FLAG_* values could be used
here, which is actually not true, as when AVIO_FLAG_READ would be used
here it would create a writable buffer as AVIO_FLAG_READ is defined as 1.

Signed-off-by: Anton Khirnov <anton@khirnov.net>
2021-12-04 14:06:30 +01:00

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/*
* 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 "libavformat/avformat.h"
#if HAVE_UNISTD_H
#include <unistd.h>
#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;
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, 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, 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)
{
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->channels = 2;
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 (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 = 1024LL * audio_st->time_base.den / audio_st->codecpar->sample_rate;
if (audio_preroll)
audio_preroll = 2048LL * audio_st->time_base.den / audio_st->codecpar->sample_rate;
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);
}
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;
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_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_out("empty-moov-no-elst");
av_dict_set(&opts, "movflags", "frag_keyframe+empty_moov", 0);
init(1, 0);
mux_gops(2);
finish();
close_out();
// 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", "0", 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", "0", 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);
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);
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);
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);
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();
av_free(md5);
av_packet_free(&pkt);
return check_faults > 0 ? 1 : 0;
}
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