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avformat/mov: Fix trampling of ctts during seeks when sidx support is enabled.

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When sidx box support is enabled, the code will skip reading all
trun boxes (each containing ctts entries for samples inthat box).

If seeks are attempted before all ctts values are known, the old
code would dump ctts entries into the wrong location. These are
then used to compute pts values which leads to out of order and
incorrectly timestamped packets.

This patch fixes ctts processing by always using the index returned
by av_add_index_entry() as the ctts_data index. When the index gains
new entries old values are reshuffled as appropriate.

This approach makes sense since the mov demuxer is already relying
on the mapping of AVIndex entries to samples for correct demuxing.

As a result of this all ctts entries are now 1-count. A followup
change will be submitted to remove support for > 1 count entries
which will simplify seeking.

Notes for future improvement:
Probably there are other boxes (stts, stsc, etc) that are impacted
by this issue... this patch only attempts to fix ctts since it
completely breaks packet timestamping.

This patch continues using an array for the ctts data, which is not
the most ideal given the rearrangement that needs to happen (via
memmove as new entries are read in). Ideally AVIndex and the ctts
data would be set-type structures so addition is always worst case
O(lg(n)) instead of the O(n^2) that exists now; this slowdown is
noticeable during seeks.

Signed-off-by: Dale Curtis <dalecurtis@chromium.org>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Dale Curtis 2017-07-17 17:38:09 -07:00 committed by Michael Niedermayer
parent c42a1388a6
commit 37e8edc9f5
4 changed files with 195 additions and 35 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
libavformat/isom.h
View File

@ -137,6 +137,7 @@ typedef struct MOVStreamContext {
unsigned int stts_count;
MOVStts *stts_data;
unsigned int ctts_count;
unsigned int ctts_allocated_size;
MOVStts *ctts_data;
unsigned int stsc_count;
MOVStsc *stsc_data;

92
libavformat/mov.c
View File

@ -74,6 +74,8 @@ typedef struct MOVParseTableEntry {
static int mov_read_default(MOVContext *c, AVIOContext *pb, MOVAtom atom);
static int mov_read_mfra(MOVContext *c, AVIOContext *f);
static int64_t add_ctts_entry(MOVStts** ctts_data, unsigned int* ctts_count, unsigned int* allocated_size,
int count, int duration);
static int mov_metadata_track_or_disc_number(MOVContext *c, AVIOContext *pb,
unsigned len, const char *key)
@ -2711,7 +2713,7 @@ static int mov_read_ctts(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
AVStream *st;
MOVStreamContext *sc;
unsigned int i, entries, ctts_count = 0;
unsigned int i, j, entries, ctts_count = 0;
if (c->fc->nb_streams < 1)
return 0;
@ -2729,7 +2731,7 @@ static int mov_read_ctts(MOVContext *c, AVIOContext *pb, MOVAtom atom)
if (entries >= UINT_MAX / sizeof(*sc->ctts_data))
return AVERROR_INVALIDDATA;
av_freep(&sc->ctts_data);
sc->ctts_data = av_realloc(NULL, entries * sizeof(*sc->ctts_data));
sc->ctts_data = av_fast_realloc(NULL, &sc->ctts_allocated_size, entries * sizeof(*sc->ctts_data));
if (!sc->ctts_data)
return AVERROR(ENOMEM);
@ -2744,9 +2746,9 @@ static int mov_read_ctts(MOVContext *c, AVIOContext *pb, MOVAtom atom)
continue;
}
sc->ctts_data[ctts_count].count = count;
sc->ctts_data[ctts_count].duration = duration;
ctts_count++;
/* Expand entries such that we have a 1-1 mapping with samples. */
for (j = 0; j < count; j++)
add_ctts_entry(&sc->ctts_data, &ctts_count, &sc->ctts_allocated_size, 1, duration);
av_log(c->fc, AV_LOG_TRACE, "count=%d, duration=%d\n",
count, duration);
@ -3049,7 +3051,6 @@ static void mov_fix_index(MOVContext *mov, AVStream *st)
int64_t index;
int64_t index_ctts_count;
int flags;
unsigned int ctts_allocated_size = 0;
int64_t start_dts = 0;
int64_t edit_list_media_time_dts = 0;
int64_t edit_list_start_encountered = 0;
@ -3084,6 +3085,7 @@ static void mov_fix_index(MOVContext *mov, AVStream *st)
msc->ctts_count = 0;
msc->ctts_index = 0;
msc->ctts_sample = 0;
msc->ctts_allocated_size = 0;
// If the dts_shift is positive (in case of negative ctts values in mov),
// then negate the DTS by dts_shift
@ -3193,7 +3195,7 @@ static void mov_fix_index(MOVContext *mov, AVStream *st)
ctts_sample_old++;
if (ctts_sample_old == ctts_data_old[ctts_index_old].count) {
if (add_ctts_entry(&msc->ctts_data, &msc->ctts_count,
&ctts_allocated_size,
&msc->ctts_allocated_size,
ctts_data_old[ctts_index_old].count - edit_list_start_ctts_sample,
ctts_data_old[ctts_index_old].duration) == -1) {
av_log(mov->fc, AV_LOG_ERROR, "Cannot add CTTS entry %"PRId64" - {%"PRId64", %d}\n",
@ -3292,7 +3294,7 @@ static void mov_fix_index(MOVContext *mov, AVStream *st)
if (ctts_data_old && ctts_sample_old != 0) {
if (add_ctts_entry(&msc->ctts_data, &msc->ctts_count,
&ctts_allocated_size,
&msc->ctts_allocated_size,
ctts_sample_old - edit_list_start_ctts_sample,
ctts_data_old[ctts_index_old].duration) == -1) {
av_log(mov->fc, AV_LOG_ERROR, "Cannot add CTTS entry %"PRId64" - {%"PRId64", %d}\n",
@ -4262,7 +4264,7 @@ static int mov_read_trun(MOVContext *c, AVIOContext *pb, MOVAtom atom)
int64_t dts;
int data_offset = 0;
unsigned entries, first_sample_flags = frag->flags;
int flags, distance, i, err, old_nb_index_entries;
int flags, distance, i;
for (i = 0; i < c->fc->nb_streams; i++) {
if (c->fc->streams[i]->id == frag->track_id) {
@ -4290,21 +4292,20 @@ static int mov_read_trun(MOVContext *c, AVIOContext *pb, MOVAtom atom)
if (!sc->ctts_count && sc->sample_count)
{
/* Complement ctts table if moov atom doesn't have ctts atom. */
ctts_data = av_realloc(NULL, sizeof(*sc->ctts_data));
ctts_data = av_fast_realloc(NULL, &sc->ctts_allocated_size, sizeof(*sc->ctts_data) * sc->sample_count);
if (!ctts_data)
return AVERROR(ENOMEM);
/* Don't use a count greater than 1 here since it will leave a gap in
* the ctts index which the code below relies on being sequential. */
sc->ctts_data = ctts_data;
sc->ctts_data[sc->ctts_count].count = sc->sample_count;
sc->ctts_data[sc->ctts_count].duration = 0;
sc->ctts_count++;
for (i = 0; i < sc->sample_count; i++) {
sc->ctts_data[sc->ctts_count].count = 1;
sc->ctts_data[sc->ctts_count].duration = 0;
sc->ctts_count++;
}
}
if ((uint64_t)entries+sc->ctts_count >= UINT_MAX/sizeof(*sc->ctts_data))
return AVERROR_INVALIDDATA;
if ((err = av_reallocp_array(&sc->ctts_data, entries + sc->ctts_count,
sizeof(*sc->ctts_data))) < 0) {
sc->ctts_count = 0;
return err;
}
if (flags & MOV_TRUN_DATA_OFFSET) data_offset = avio_rb32(pb);
if (flags & MOV_TRUN_FIRST_SAMPLE_FLAGS) first_sample_flags = avio_rb32(pb);
dts = sc->track_end - sc->time_offset;
@ -4315,26 +4316,28 @@ static int mov_read_trun(MOVContext *c, AVIOContext *pb, MOVAtom atom)
unsigned sample_size = frag->size;
int sample_flags = i ? frag->flags : first_sample_flags;
unsigned sample_duration = frag->duration;
unsigned ctts_duration = 0;
int keyframe = 0;
int ctts_index = 0;
int old_nb_index_entries = st->nb_index_entries;
if (flags & MOV_TRUN_SAMPLE_DURATION) sample_duration = avio_rb32(pb);
if (flags & MOV_TRUN_SAMPLE_SIZE) sample_size = avio_rb32(pb);
if (flags & MOV_TRUN_SAMPLE_FLAGS) sample_flags = avio_rb32(pb);
sc->ctts_data[sc->ctts_count].count = 1;
sc->ctts_data[sc->ctts_count].duration = (flags & MOV_TRUN_SAMPLE_CTS) ?
avio_rb32(pb) : 0;
mov_update_dts_shift(sc, sc->ctts_data[sc->ctts_count].duration);
if (flags & MOV_TRUN_SAMPLE_CTS) ctts_duration = avio_rb32(pb);
mov_update_dts_shift(sc, ctts_duration);
if (frag->time != AV_NOPTS_VALUE) {
if (c->use_mfra_for == FF_MOV_FLAG_MFRA_PTS) {
int64_t pts = frag->time;
av_log(c->fc, AV_LOG_DEBUG, "found frag time %"PRId64
" sc->dts_shift %d ctts.duration %d"
" sc->time_offset %"PRId64" flags & MOV_TRUN_SAMPLE_CTS %d\n", pts,
sc->dts_shift, sc->ctts_data[sc->ctts_count].duration,
sc->dts_shift, ctts_duration,
sc->time_offset, flags & MOV_TRUN_SAMPLE_CTS);
dts = pts - sc->dts_shift;
if (flags & MOV_TRUN_SAMPLE_CTS) {
dts -= sc->ctts_data[sc->ctts_count].duration;
dts -= ctts_duration;
} else {
dts -= sc->time_offset;
}
@ -4346,7 +4349,7 @@ static int mov_read_trun(MOVContext *c, AVIOContext *pb, MOVAtom atom)
}
frag->time = AV_NOPTS_VALUE;
}
sc->ctts_count++;
if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO)
keyframe = 1;
else
@ -4355,19 +4358,38 @@ static int mov_read_trun(MOVContext *c, AVIOContext *pb, MOVAtom atom)
MOV_FRAG_SAMPLE_FLAG_DEPENDS_YES));
if (keyframe)
distance = 0;
old_nb_index_entries = st->nb_index_entries;
err = av_add_index_entry(st, offset, dts, sample_size, distance,
keyframe ? AVINDEX_KEYFRAME : 0);
if (err < 0) {
ctts_index = av_add_index_entry(st, offset, dts, sample_size, distance,
keyframe ? AVINDEX_KEYFRAME : 0);
if (ctts_index >= 0 && old_nb_index_entries < st->nb_index_entries) {
unsigned int size_needed = st->nb_index_entries * sizeof(*sc->ctts_data);
unsigned int request_size = size_needed > sc->ctts_allocated_size ?
FFMAX(size_needed, 2 * sc->ctts_allocated_size) : size_needed;
ctts_data = av_fast_realloc(sc->ctts_data, &sc->ctts_allocated_size, request_size);
if (!ctts_data) {
av_freep(&sc->ctts_data);
return AVERROR(ENOMEM);
}
sc->ctts_data = ctts_data;
if (ctts_index != old_nb_index_entries) {
memmove(sc->ctts_data + ctts_index + 1, sc->ctts_data + ctts_index,
sizeof(*sc->ctts_data) * (sc->ctts_count - ctts_index));
if (ctts_index <= sc->current_sample) {
// if we inserted a new item before the current sample, move the
// counter ahead so it is still pointing to the same sample.
sc->current_sample++;
}
}
sc->ctts_data[ctts_index].count = 1;
sc->ctts_data[ctts_index].duration = ctts_duration;
sc->ctts_count++;
} else {
av_log(c->fc, AV_LOG_ERROR, "Failed to add index entry\n");
} else if (err <= sc->current_sample && err + 1 != st->nb_index_entries &&
st->nb_index_entries != old_nb_index_entries) {
// if we inserted a new item before the current sample, move the
// counter ahead so it is still pointing to the same sample.
sc->current_sample++;
}
av_log(c->fc, AV_LOG_TRACE, "AVIndex stream %d, sample %d, offset %"PRIx64", dts %"PRId64", "
"size %u, distance %d, keyframe %d\n", st->index, err,
"size %u, distance %d, keyframe %d\n", st->index, ctts_index,
offset, dts, sample_size, distance, keyframe);
distance++;
dts += sample_duration;

3
tests/fate/seek.mak
View File

@ -248,7 +248,10 @@ FATE_SEEK += $(FATE_SEEK_LAVF-yes:%=fate-seek-lavf-%)
FATE_SEEK_EXTRA-$(CONFIG_MP3_DEMUXER) += fate-seek-extra-mp3
FATE_SEEK_EXTRA-$(call ALLYES, CACHE_PROTOCOL PIPE_PROTOCOL MP3_DEMUXER) += fate-seek-cache-pipe
FATE_SEEK_EXTRA-$(CONFIG_MATROSKA_DEMUXER) += fate-seek-mkv-codec-delay
FATE_SEEK_EXTRA-$(CONFIG_MOV_DEMUXER) += fate-seek-extra-mp4
fate-seek-extra-mp3: CMD = run libavformat/tests/seek$(EXESUF) $(TARGET_SAMPLES)/gapless/gapless.mp3 -fastseek 1
fate-seek-extra-mp4: CMD = run libavformat/tests/seek$(EXESUF) $(TARGET_SAMPLES)/mov/buck480p30_na.mp4 -duration 180 -frames 4
fate-seek-cache-pipe: CMD = cat $(TARGET_SAMPLES)/gapless/gapless.mp3 | run libavformat/tests/seek$(EXESUF) cache:pipe:0 -read_ahead_limit -1
fate-seek-mkv-codec-delay: CMD = run libavformat/tests/seek$(EXESUF) $(TARGET_SAMPLES)/mkv/codec_delay_opus.mkv

134
tests/ref/seek/extra-mp4 Normal file
View File

@ -0,0 +1,134 @@
ret: 0 st: 0 flags:1 dts:-0.033333 pts: 0.000000 pos: 1287 size: 183
ret: 0 st: 0 flags:0 dts: 0.000000 pts: 0.033333 pos: 1470 size: 24
ret: 0 st: 0 flags:0 dts: 0.033333 pts: 0.066667 pos: 1494 size: 6779
ret: 0 st: 0 flags:0 dts: 0.066667 pts: 0.100000 pos: 8273 size: 11041
ret: 0 st:-1 flags:0 ts:-1.000000
ret: 0 st: 0 flags:1 dts:-0.033333 pts: 0.000000 pos: 1287 size: 183
ret: 0 st: 0 flags:0 dts: 0.000000 pts: 0.033333 pos: 1470 size: 24
ret: 0 st: 0 flags:0 dts: 0.033333 pts: 0.066667 pos: 1494 size: 6779
ret: 0 st: 0 flags:0 dts: 0.066667 pts: 0.100000 pos: 8273 size: 11041
ret: 0 st:-1 flags:1 ts: 101.894167
ret: 0 st: 0 flags:1 dts: 101.300000 pts: 101.333333 pos:10982311 size: 67237
ret: 0 st: 0 flags:0 dts: 101.333333 pts: 101.433333 pos:11049548 size: 3524
ret: 0 st: 0 flags:0 dts: 101.366667 pts: 101.366667 pos:11053072 size: 562
ret: 0 st: 0 flags:0 dts: 101.400000 pts: 101.400000 pos:11053634 size: 599
ret: 0 st: 0 flags:0 ts: 24.788333
ret: 0 st: 0 flags:1 dts: 25.300000 pts: 25.333333 pos:2607246 size: 40273
ret: 0 st: 0 flags:0 dts: 25.333333 pts: 25.433333 pos:2647519 size: 2959
ret: 0 st: 0 flags:0 dts: 25.366667 pts: 25.366667 pos:2650478 size: 197
ret: 0 st: 0 flags:0 dts: 25.400000 pts: 25.400000 pos:2650675 size: 230
ret: 0 st: 0 flags:1 ts: 127.682500
ret: 0 st: 0 flags:1 dts: 126.633333 pts: 126.666667 pos:13359975 size: 68741
ret: 0 st: 0 flags:0 dts: 126.666667 pts: 126.766667 pos:13428716 size: 2914
ret: 0 st: 0 flags:0 dts: 126.700000 pts: 126.700000 pos:13431630 size: 781
ret: 0 st: 0 flags:0 dts: 126.733333 pts: 126.733333 pos:13432411 size: 817
ret: 0 st:-1 flags:0 ts: 50.576668
ret: 0 st: 0 flags:1 dts: 50.600000 pts: 50.633333 pos:5858254 size: 67903
ret: 0 st: 0 flags:0 dts: 50.633333 pts: 50.733333 pos:5926157 size: 1307
ret: 0 st: 0 flags:0 dts: 50.666667 pts: 50.666667 pos:5927464 size: 150
ret: 0 st: 0 flags:0 dts: 50.700000 pts: 50.700000 pos:5927614 size: 176
ret: 0 st:-1 flags:1 ts: 153.470835
ret: 0 st: 0 flags:1 dts: 153.466667 pts: 153.500000 pos:15867700 size: 96169
ret: 0 st: 0 flags:0 dts: 153.500000 pts: 153.533333 pos:15963869 size: 785
ret: 0 st: 0 flags:0 dts: 153.533333 pts: 153.633333 pos:15964654 size: 3135
ret: 0 st: 0 flags:0 dts: 153.566667 pts: 153.566667 pos:15967789 size: 859
ret: 0 st: 0 flags:0 ts: 76.365000
ret: 0 st: 0 flags:1 dts: 77.833333 pts: 77.866667 pos:8659657 size: 41182
ret: 0 st: 0 flags:0 dts: 77.866667 pts: 77.966667 pos:8700839 size: 4197
ret: 0 st: 0 flags:0 dts: 77.900000 pts: 77.900000 pos:8705036 size: 653
ret: 0 st: 0 flags:0 dts: 77.933333 pts: 77.933333 pos:8705689 size: 751
ret: 0 st: 0 flags:1 ts:-0.740833
ret: 0 st: 0 flags:1 dts:-0.033333 pts: 0.000000 pos: 1287 size: 183
ret: 0 st: 0 flags:0 dts: 0.000000 pts: 0.033333 pos: 1470 size: 24
ret: 0 st: 0 flags:0 dts: 0.033333 pts: 0.066667 pos: 1494 size: 6779
ret: 0 st: 0 flags:0 dts: 0.066667 pts: 0.100000 pos: 8273 size: 11041
ret: 0 st:-1 flags:0 ts: 102.153336
ret: 0 st: 0 flags:1 dts: 104.066667 pts: 104.100000 pos:11116461 size:112929
ret: 0 st: 0 flags:0 dts: 104.100000 pts: 104.133333 pos:11229390 size: 585
ret: 0 st: 0 flags:0 dts: 104.133333 pts: 104.166667 pos:11229975 size: 797
ret: 0 st: 0 flags:0 dts: 104.166667 pts: 104.200000 pos:11230772 size: 810
ret: 0 st:-1 flags:1 ts: 25.047503
ret: 0 st: 0 flags:1 dts: 20.233333 pts: 20.266667 pos:2223959 size: 51823
ret: 0 st: 0 flags:0 dts: 20.266667 pts: 20.300000 pos:2275782 size: 488
ret: 0 st: 0 flags:0 dts: 20.300000 pts: 20.400000 pos:2276270 size: 670
ret: 0 st: 0 flags:0 dts: 20.333333 pts: 20.333333 pos:2276940 size: 84
ret: 0 st: 0 flags:0 ts: 127.941667
ret: 0 st: 0 flags:1 dts: 131.233333 pts: 131.266667 pos:13727953 size: 62229
ret: 0 st: 0 flags:0 dts: 131.266667 pts: 131.366667 pos:13790182 size: 2349
ret: 0 st: 0 flags:0 dts: 131.300000 pts: 131.300000 pos:13792531 size: 571
ret: 0 st: 0 flags:0 dts: 131.333333 pts: 131.333333 pos:13793102 size: 1190
ret: 0 st: 0 flags:1 ts: 50.835833
ret: 0 st: 0 flags:1 dts: 50.600000 pts: 50.633333 pos:5858254 size: 67903
ret: 0 st: 0 flags:0 dts: 50.633333 pts: 50.733333 pos:5926157 size: 1307
ret: 0 st: 0 flags:0 dts: 50.666667 pts: 50.666667 pos:5927464 size: 150
ret: 0 st: 0 flags:0 dts: 50.700000 pts: 50.700000 pos:5927614 size: 176
ret: 0 st:-1 flags:0 ts: 153.730004
ret: 0 st: 0 flags:1 dts: 157.033333 pts: 157.066667 pos:16225365 size: 82738
ret: 0 st: 0 flags:0 dts: 157.066667 pts: 157.166667 pos:16308103 size: 2273
ret: 0 st: 0 flags:0 dts: 157.100000 pts: 157.100000 pos:16310376 size: 350
ret: 0 st: 0 flags:0 dts: 157.133333 pts: 157.133333 pos:16310726 size: 337
ret: 0 st:-1 flags:1 ts: 76.624171
ret: 0 st: 0 flags:1 dts: 75.966667 pts: 76.000000 pos:8520178 size: 94395
ret: 0 st: 0 flags:0 dts: 76.000000 pts: 76.100000 pos:8614573 size: 483
ret: 0 st: 0 flags:0 dts: 76.033333 pts: 76.033333 pos:8615056 size: 37
ret: 0 st: 0 flags:0 dts: 76.066667 pts: 76.066667 pos:8615093 size: 56
ret: 0 st: 0 flags:0 ts:-0.481667
ret: 0 st: 0 flags:1 dts:-0.033333 pts: 0.000000 pos: 1287 size: 183
ret: 0 st: 0 flags:0 dts: 0.000000 pts: 0.033333 pos: 1470 size: 24
ret: 0 st: 0 flags:0 dts: 0.033333 pts: 0.066667 pos: 1494 size: 6779
ret: 0 st: 0 flags:0 dts: 0.066667 pts: 0.100000 pos: 8273 size: 11041
ret: 0 st: 0 flags:1 ts: 102.412500
ret: 0 st: 0 flags:1 dts: 101.300000 pts: 101.333333 pos:10982311 size: 67237
ret: 0 st: 0 flags:0 dts: 101.333333 pts: 101.433333 pos:11049548 size: 3524
ret: 0 st: 0 flags:0 dts: 101.366667 pts: 101.366667 pos:11053072 size: 562
ret: 0 st: 0 flags:0 dts: 101.400000 pts: 101.400000 pos:11053634 size: 599
ret: 0 st:-1 flags:0 ts: 25.306672
ret: 0 st: 0 flags:1 dts: 27.400000 pts: 27.433333 pos:2674605 size:127383
ret: 0 st: 0 flags:0 dts: 27.433333 pts: 27.466667 pos:2801988 size: 68
ret: 0 st: 0 flags:0 dts: 27.466667 pts: 27.500000 pos:2802268 size: 1754
ret: 0 st: 0 flags:0 dts: 27.500000 pts: 27.533333 pos:2804022 size: 4071
ret: 0 st:-1 flags:1 ts: 128.200839
ret: 0 st: 0 flags:1 dts: 127.833333 pts: 127.866667 pos:13514072 size: 67382
ret: 0 st: 0 flags:0 dts: 127.866667 pts: 127.966667 pos:13581454 size: 2936
ret: 0 st: 0 flags:0 dts: 127.900000 pts: 127.900000 pos:13584390 size: 451
ret: 0 st: 0 flags:0 dts: 127.933333 pts: 127.933333 pos:13584841 size: 537
ret: 0 st: 0 flags:0 ts: 51.095011
ret: 0 st: 0 flags:1 dts: 52.033333 pts: 52.066667 pos:6028050 size:115809
ret: 0 st: 0 flags:0 dts: 52.066667 pts: 52.166667 pos:6143859 size: 1620
ret: 0 st: 0 flags:0 dts: 52.100000 pts: 52.100000 pos:6145479 size: 92
ret: 0 st: 0 flags:0 dts: 52.133333 pts: 52.133333 pos:6145571 size: 533
ret: 0 st: 0 flags:1 ts: 153.989178
ret: 0 st: 0 flags:1 dts: 153.466667 pts: 153.500000 pos:15867700 size: 96169
ret: 0 st: 0 flags:0 dts: 153.500000 pts: 153.533333 pos:15963869 size: 785
ret: 0 st: 0 flags:0 dts: 153.533333 pts: 153.633333 pos:15964654 size: 3135
ret: 0 st: 0 flags:0 dts: 153.566667 pts: 153.566667 pos:15967789 size: 859
ret: 0 st:-1 flags:0 ts: 76.883340
ret: 0 st: 0 flags:1 dts: 77.833333 pts: 77.866667 pos:8659657 size: 41182
ret: 0 st: 0 flags:0 dts: 77.866667 pts: 77.966667 pos:8700839 size: 4197
ret: 0 st: 0 flags:0 dts: 77.900000 pts: 77.900000 pos:8705036 size: 653
ret: 0 st: 0 flags:0 dts: 77.933333 pts: 77.933333 pos:8705689 size: 751
ret: 0 st:-1 flags:1 ts:-0.222493
ret: 0 st: 0 flags:1 dts:-0.033333 pts: 0.000000 pos: 1287 size: 183
ret: 0 st: 0 flags:0 dts: 0.000000 pts: 0.033333 pos: 1470 size: 24
ret: 0 st: 0 flags:0 dts: 0.033333 pts: 0.066667 pos: 1494 size: 6779
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