diff mbox

[FFmpeg-devel,mov] Fix trampling of ctts during seeks when sidx support is enabled.

Message ID CAPUDrweda1RPninUYje7-5pUNQNR401fUxyqnXnksvgfOkEiNg@mail.gmail.com
State Superseded
Headers show

Commit Message

Dale Curtis July 31, 2017, 9:29 p.m. UTC 
Here's an updated patch with a fate test attached. You'll need to add
http://storage.googleapis.com/dalecurtis/buck480p30_na.mp4 to the
fate-suite/mov for this test. This is licensed under creative commons
attribution, so it should be fine for tests:
https://peach.blender.org/about/ I tried to use the existing samples, but
you need a clip long enough that the entire index isn't generated from the
start.

- dale

On Tue, Jul 25, 2017 at 1:03 PM, Michael Niedermayer <michael@niedermayer.cc
> wrote:

> On Mon, Jul 24, 2017 at 02:32:41PM -0700, Dale Curtis wrote:
> > On Thu, Jul 20, 2017 at 5:00 AM, Michael Niedermayer
> <michael@niedermayer.cc
> > > wrote:
> >
> > > Hi
> > >
> > > On Wed, Jul 19, 2017 at 07:30:01PM -0700, Dale Curtis wrote:
> > > > Thanks will take a look. Is this test not part of fate? make fate
> passed
> > >
> > > no, we should have tests for all (fixed) tickets in fate ideally
> > > but in reality most tickets lack a corresponding test
> > > I tried both in outreachy and as well in GSoC to improve this situation
> > > with student projects but both only moved this forward by a small
> > > step. Its a large amount of work to create robust, portable and
> > > practical tests for "all" tickets and everything else.
> > > The way out to get this actually done would be to pay a developer to
> > > create tests for "all" tickets in fate. I belive carl would be the
> > > ideal one to do this work as he has since a very long time always
> tested
> > > and kept track of all our tickets.
> > > I did suggest a while ago to someone at google that funding such
> > > project would make sense but IIRC i never heared back.
> > > if some company would fund something like this, i belive this would be
> > > very usefull in the long run for code quality
> > >
> >
> > I think it'd be pretty hard to get someone to go through and create tests
> > for every issue ever seen. Even Chromium has trouble with this, but
> making
>
> yes, unless theres someone who enjoys doing this kind of work.
>
>
> > it part of the culture helps. I.e. reviewers should ask for every change
> to
> > include a test.
>
> yes though theres already
> 1.8 patch submission checklist
> ...
> 26. Consider adding a regression test for your code.
> on http://ffmpeg.org/developer.html
>
>
> > I'm happy to add one to fate for this change. Or can do so
> > in a followup patch if you prefer.
>
> please do (any variant is fine)
>
> thx
>
> >
> > Does anyone have comments on this change specifically? We've already
> rolled
> > this into Chrome and it's working fine and passing all regression tests.
> > _______________________________________________
> > ffmpeg-devel mailing list
> > ffmpeg-devel@ffmpeg.org
> > http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>
> --
> Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
>
> Breaking DRM is a little like attempting to break through a door even
> though the window is wide open and the only thing in the house is a bunch
> of things you dont want and which you would get tomorrow for free anyway
>
> _______________________________________________
> ffmpeg-devel mailing list
> ffmpeg-devel@ffmpeg.org
> http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>
>

Comments

Michael Niedermayer Aug. 4, 2017, 11:38 p.m. UTC | #1 
On Mon, Jul 31, 2017 at 02:29:29PM -0700, Dale Curtis wrote:
> Here's an updated patch with a fate test attached. You'll need to add
> http://storage.googleapis.com/dalecurtis/buck480p30_na.mp4 to the
> fate-suite/mov for this test. This is licensed under creative commons
> attribution, so it should be fine for tests:
> https://peach.blender.org/about/ I tried to use the existing samples, but
> you need a clip long enough that the entire index isn't generated from the
> start.

so theres no easy way to create a smaller file then 64mb ?

iam trying to keep the size of the fate samples small,
imagening 64mb * thousands of tests and each fate client needs a copy
of this...


[...]
Dale Curtis Aug. 7, 2017, 7:32 p.m. UTC | #2 
On Fri, Aug 4, 2017 at 4:38 PM, Michael Niedermayer <michael@niedermayer.cc>
wrote:

> so theres no easy way to create a smaller file then 64mb ?
>

Ah no, I didn't realize you had a size limit; I just meant none of the
existing clips were large enough / worked. I've truncated the clip at
http://storage.googleapis.com/dalecurtis/buck480p30_na.mp4 to 180 seconds
and the seek test passes and fails correctly.
Michael Niedermayer Aug. 24, 2017, 12:17 a.m. UTC | #3 
On Mon, Aug 07, 2017 at 12:32:16PM -0700, Dale Curtis wrote:
> On Fri, Aug 4, 2017 at 4:38 PM, Michael Niedermayer <michael@niedermayer.cc>
> wrote:
> 
> > so theres no easy way to create a smaller file then 64mb ?
> >
> 
> Ah no, I didn't realize you had a size limit; I just meant none of the
> existing clips were large enough / worked. I've truncated the clip at
> http://storage.googleapis.com/dalecurtis/buck480p30_na.mp4 to 180 seconds
> and the seek test passes and fails correctly.

file uploded

thx

[...]
diff mbox

Patch

From 8c99024ff723853d8d8f83d9862b884e57fe2b83 Mon Sep 17 00:00:00 2001
From: Dale Curtis <dalecurtis@chromium.org>
Date: Mon, 17 Jul 2017 17:38:09 -0700
Subject: [PATCH] Fix trampling of ctts during seeks when sidx support is
 enabled.

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.

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.

Additionally since ctts samples from trun boxes always have a count
of 1, there's probably an opportunity to avoid the post-seek fixup
that iterates O(n) over all samples with an O(1) when no non-1 count
samples are present.

Signed-off-by: Dale Curtis <dalecurtis@chromium.org>
---
 libavformat/isom.h       |   1 +
 libavformat/mov.c        |  58 ++++++++++++--------
 tests/fate/seek.mak      |   3 ++
 tests/ref/seek/extra-mp4 | 134 +++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 175 insertions(+), 21 deletions(-)
 create mode 100644 tests/ref/seek/extra-mp4

diff --git a/libavformat/isom.h b/libavformat/isom.h
index ff009b0896..fdd98c28f5 100644
--- a/libavformat/isom.h
+++ b/libavformat/isom.h
@@ -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;
diff --git a/libavformat/mov.c b/libavformat/mov.c
index 63f84be782..ab8e914581 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -2726,7 +2726,7 @@  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);
 
@@ -3046,7 +3046,6 @@  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;
@@ -3081,6 +3080,7 @@  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
@@ -3190,7 +3190,7 @@  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",
@@ -3289,7 +3289,7 @@  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",
@@ -4259,7 +4259,7 @@  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;
+    int flags, distance, i;
 
     for (i = 0; i < c->fc->nb_streams; i++) {
         if (c->fc->streams[i]->id == frag->track_id) {
@@ -4287,7 +4287,7 @@  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));
         if (!ctts_data)
             return AVERROR(ENOMEM);
         sc->ctts_data = ctts_data;
@@ -4297,11 +4297,6 @@  static int mov_read_trun(MOVContext *c, AVIOContext *pb, MOVAtom atom)
     }
     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;
@@ -4312,26 +4307,28 @@  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;
                 }
@@ -4343,7 +4340,7 @@  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
@@ -4352,11 +4349,30 @@  static int mov_read_trun(MOVContext *c, AVIOContext *pb, MOVAtom atom)
                                   MOV_FRAG_SAMPLE_FLAG_DEPENDS_YES));
         if (keyframe)
             distance = 0;
-        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;
+            sc->ctts_data = av_fast_realloc(sc->ctts_data, &sc->ctts_allocated_size, request_size);
+            if (!sc->ctts_data) {
+                sc->ctts_count = 0;
+                return AVERROR(ENOMEM);
+            }
+
+            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));
+            }
+
+            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");
         }
+
         av_log(c->fc, AV_LOG_TRACE, "AVIndex stream %d, sample %u, offset %"PRIx64", dts %"PRId64", "
                 "size %u, distance %d, keyframe %d\n", st->index, sc->sample_count+i,
                 offset, dts, sample_size, distance, keyframe);
diff --git a/tests/fate/seek.mak b/tests/fate/seek.mak
index f835da5226..1a6e584987 100644
--- a/tests/fate/seek.mak
+++ b/tests/fate/seek.mak
@@ -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
 
diff --git a/tests/ref/seek/extra-mp4 b/tests/ref/seek/extra-mp4
new file mode 100644
index 0000000000..960f2dfad8
--- /dev/null
+++ b/tests/ref/seek/extra-mp4
@@ -0,0 +1,134 @@ 
+ret: 0         st: 0 flags:1 dts:-0.033333 pts: 0.000000 pos:   4174 size:   147
+ret: 0         st: 0 flags:0 dts: 0.000000 pts: 0.033333 pos:   4321 size:    24
+ret: 0         st: 0 flags:0 dts: 0.033333 pts: 0.066667 pos:   4345 size:  6779
+ret: 0         st: 0 flags:0 dts: 0.066667 pts: 0.100000 pos:  11124 size: 11041
+ret: 0         st:-1 flags:0  ts:-1.000000
+ret: 0         st: 0 flags:1 dts:-0.033333 pts: 0.000000 pos:   4174 size:   147
+ret: 0         st: 0 flags:0 dts: 0.000000 pts: 0.033333 pos:   4321 size:    24
+ret: 0         st: 0 flags:0 dts: 0.033333 pts: 0.066667 pos:   4345 size:  6779
+ret: 0         st: 0 flags:0 dts: 0.066667 pts: 0.100000 pos:  11124 size: 11041
+ret: 0         st:-1 flags:1  ts: 101.894167
+ret: 0         st: 0 flags:1 dts: 101.300000 pts: 101.333333 pos:10974394 size: 67201
+ret: 0         st: 0 flags:0 dts: 101.333333 pts: 101.433333 pos:11041595 size:  3524
+ret: 0         st: 0 flags:0 dts: 101.366667 pts: 101.366667 pos:11045119 size:   562
+ret: 0         st: 0 flags:0 dts: 101.400000 pts: 101.400000 pos:11045681 size:   599
+ret: 0         st: 0 flags:0  ts: 24.788333
+ret: 0         st: 0 flags:1 dts: 25.300000 pts: 25.333333 pos:2607665 size: 40237
+ret: 0         st: 0 flags:0 dts: 25.333333 pts: 25.433333 pos:2647902 size:  2959
+ret: 0         st: 0 flags:0 dts: 25.366667 pts: 25.366667 pos:2650861 size:   197
+ret: 0         st: 0 flags:0 dts: 25.400000 pts: 25.400000 pos:2651058 size:   230
+ret: 0         st: 0 flags:1  ts: 127.682500
+ret: 0         st: 0 flags:1 dts: 126.633333 pts: 126.666667 pos:13349318 size: 68705
+ret: 0         st: 0 flags:0 dts: 126.666667 pts: 126.766667 pos:13418023 size:  2914
+ret: 0         st: 0 flags:0 dts: 126.700000 pts: 126.700000 pos:13420937 size:   781
+ret: 0         st: 0 flags:0 dts: 126.733333 pts: 126.733333 pos:13421718 size:   817
+ret: 0         st:-1 flags:0  ts: 50.576668
+ret: 0         st: 0 flags:1 dts: 50.633333 pts: 50.666667 pos:5856029 size: 67867
+ret: 0         st: 0 flags:0 dts: 50.666667 pts: 50.766667 pos:5923896 size:  1307
+ret: 0         st: 0 flags:0 dts: 50.700000 pts: 50.700000 pos:5925203 size:   150
+ret: 0         st: 0 flags:0 dts: 50.733333 pts: 50.733333 pos:5925353 size:   176
+ret: 0         st:-1 flags:1  ts: 153.470835
+ret: 0         st: 0 flags:1 dts: 153.466667 pts: 153.500000 pos:15853683 size: 96133
+ret: 0         st: 0 flags:0 dts: 153.500000 pts: 153.533333 pos:15949816 size:   785
+ret: 0         st: 0 flags:0 dts: 153.533333 pts: 153.633333 pos:15950601 size:  3135
+ret: 0         st: 0 flags:0 dts: 153.566667 pts: 153.566667 pos:15953736 size:   859
+ret: 0         st: 0 flags:0  ts: 76.365000
+ret: 0         st: 0 flags:1 dts: 77.833333 pts: 77.866667 pos:8653728 size: 41146
+ret: 0         st: 0 flags:0 dts: 77.866667 pts: 77.966667 pos:8694874 size:  4197
+ret: 0         st: 0 flags:0 dts: 77.900000 pts: 77.900000 pos:8699071 size:   653
+ret: 0         st: 0 flags:0 dts: 77.933333 pts: 77.933333 pos:8699724 size:   751
+ret: 0         st: 0 flags:1  ts:-0.740833
+ret: 0         st: 0 flags:1 dts:-0.033333 pts: 0.000000 pos:   4174 size:   147
+ret: 0         st: 0 flags:0 dts: 0.000000 pts: 0.033333 pos:   4321 size:    24
+ret: 0         st: 0 flags:0 dts: 0.033333 pts: 0.066667 pos:   4345 size:  6779
+ret: 0         st: 0 flags:0 dts: 0.066667 pts: 0.100000 pos:  11124 size: 11041
+ret: 0         st:-1 flags:0  ts: 102.153336
+ret: 0         st: 0 flags:0 dts: 83.833333 pts: 83.900000 pos:9584397 size:  8129
+ret: 0         st: 0 flags:0 dts: 83.866667 pts: 83.866667 pos:9592526 size:  2247
+ret: 0         st: 0 flags:0 dts: 83.900000 pts: 83.966667 pos:9594773 size:  8990
+ret: 0         st: 0 flags:0 dts: 83.933333 pts: 83.933333 pos:9603763 size:  2386
+ret: 0         st:-1 flags:1  ts: 25.047503
+ret: 0         st: 0 flags:1 dts: 20.233333 pts: 20.266667 pos:2224826 size: 51787
+ret: 0         st: 0 flags:0 dts: 20.266667 pts: 20.300000 pos:2276613 size:   488
+ret: 0         st: 0 flags:0 dts: 20.300000 pts: 20.400000 pos:2277101 size:   670
+ret: 0         st: 0 flags:0 dts: 20.333333 pts: 20.333333 pos:2277771 size:    84
+ret: 0         st: 0 flags:0  ts: 127.941667
+ret: 0         st: 0 flags:1 dts: 95.766667 pts: 95.800000 pos:10533174 size: 54642
+ret: 0         st: 0 flags:0 dts: 95.800000 pts: 95.833333 pos:10587816 size:   278
+ret: 0         st: 0 flags:0 dts: 95.833333 pts: 95.866667 pos:10588094 size:   101
+ret: 0         st: 0 flags:0 dts: 95.866667 pts: 95.900000 pos:10588195 size:    87
+ret: 0         st: 0 flags:1  ts: 50.835833
+ret: 0         st: 0 flags:1 dts: 50.633333 pts: 50.666667 pos:5856029 size: 67867
+ret: 0         st: 0 flags:0 dts: 50.666667 pts: 50.766667 pos:5923896 size:  1307
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-- 
2.14.0.rc0.400.g1c36432dff-goog