diff mbox series

[FFmpeg-devel,1/3] lavf/dv: do not set video timebase more than once

Message ID 20230424155553.24560-1-anton@khirnov.net
State New
Headers show
Series [FFmpeg-devel,1/3] lavf/dv: do not set video timebase more than once | expand

Checks

Context Check Description
yinshiyou/make_loongarch64 success Make finished
yinshiyou/make_fate_loongarch64 success Make fate finished
andriy/make_x86 success Make finished
andriy/make_fate_x86 success Make fate finished

Commit Message

Anton Khirnov April 24, 2023, 3:55 p.m. UTC 
Current code will call avpriv_set_pts_info() for each video frame,
possibly setting a different timebase if the stream framerate changes.
This violates API conventions, as the timebase is supposed to stay
constant after stream creation.

Change the demuxer to set a single timebase that is fine enough to
handle all supported DV framerates.

The seek tests change slightly because the new timebase is more
granular.
---
 libavcodec/dv.h                   |  3 +++
 libavformat/dv.c                  | 25 ++++++++++++++++++++-----
 tests/ref/seek/lavf-dv            | 16 ++++++++--------
 tests/ref/seek/vsynth_lena-dv     | 24 ++++++++++++------------
 tests/ref/seek/vsynth_lena-dv-411 | 24 ++++++++++++------------
 tests/ref/seek/vsynth_lena-dv-50  | 24 ++++++++++++------------
 6 files changed, 67 insertions(+), 49 deletions(-)

Comments

Michael Niedermayer April 26, 2023, 11:54 a.m. UTC | #1 
On Mon, Apr 24, 2023 at 05:55:51PM +0200, Anton Khirnov wrote:
> Current code will call avpriv_set_pts_info() for each video frame,
> possibly setting a different timebase if the stream framerate changes.
> This violates API conventions, as the timebase is supposed to stay
> constant after stream creation.
> 
> Change the demuxer to set a single timebase that is fine enough to
> handle all supported DV framerates.
> 
> The seek tests change slightly because the new timebase is more
> granular.
> ---
>  libavcodec/dv.h                   |  3 +++
>  libavformat/dv.c                  | 25 ++++++++++++++++++++-----
>  tests/ref/seek/lavf-dv            | 16 ++++++++--------
>  tests/ref/seek/vsynth_lena-dv     | 24 ++++++++++++------------
>  tests/ref/seek/vsynth_lena-dv-411 | 24 ++++++++++++------------
>  tests/ref/seek/vsynth_lena-dv-50  | 24 ++++++++++++------------
>  6 files changed, 67 insertions(+), 49 deletions(-)

This breaks:

./ffmpeg -ss 4:56 -i ~/tickets/4086/Oca-Agu\ 1995.avi -codec copy -t 1 -bitexact 4086-30frames.dv
(the file is empty after the patch)

The file seems no longer available on the original link and a little big
ill put it in your home directory on the server probably in 30+min or so.
once you are done with it please delete it off the server so it doesnt eat
diskspace

thx


[...]
Anton Khirnov April 27, 2023, 7:48 a.m. UTC | #2 
Quoting Michael Niedermayer (2023-04-26 13:54:10)
> On Mon, Apr 24, 2023 at 05:55:51PM +0200, Anton Khirnov wrote:
> > Current code will call avpriv_set_pts_info() for each video frame,
> > possibly setting a different timebase if the stream framerate changes.
> > This violates API conventions, as the timebase is supposed to stay
> > constant after stream creation.
> > 
> > Change the demuxer to set a single timebase that is fine enough to
> > handle all supported DV framerates.
> > 
> > The seek tests change slightly because the new timebase is more
> > granular.
> > ---
> >  libavcodec/dv.h                   |  3 +++
> >  libavformat/dv.c                  | 25 ++++++++++++++++++++-----
> >  tests/ref/seek/lavf-dv            | 16 ++++++++--------
> >  tests/ref/seek/vsynth_lena-dv     | 24 ++++++++++++------------
> >  tests/ref/seek/vsynth_lena-dv-411 | 24 ++++++++++++------------
> >  tests/ref/seek/vsynth_lena-dv-50  | 24 ++++++++++++------------
> >  6 files changed, 67 insertions(+), 49 deletions(-)
> 
> This breaks:
> 
> ./ffmpeg -ss 4:56 -i ~/tickets/4086/Oca-Agu\ 1995.avi -codec copy -t 1 -bitexact 4086-30frames.dv
> (the file is empty after the patch)
> 
> The file seems no longer available on the original link and a little big
> ill put it in your home directory on the server probably in 30+min or so.
> once you are done with it please delete it off the server so it doesnt eat
> diskspace

Thank you, file downloaded and deleted.

Seems we do not have any FATE tests for dv in avi - do you (or anyone
else) have a reasonably small sample that can be used for that?
diff mbox series

Patch

diff --git a/libavcodec/dv.h b/libavcodec/dv.h
index 29f97b6089a..b473bdc992d 100644
--- a/libavcodec/dv.h
+++ b/libavcodec/dv.h
@@ -60,6 +60,9 @@  enum DVPackType {
  */
 #define DV_MAX_FRAME_SIZE 576000
 
+// LCM of video framerate numerators
+#define DV_TIMESCALE_VIDEO 60000
+
 /**
  * maximum number of blocks per macroblock in any DV format
  */
diff --git a/libavformat/dv.c b/libavformat/dv.c
index ffed1a7a90e..d30dc298805 100644
--- a/libavformat/dv.c
+++ b/libavformat/dv.c
@@ -69,6 +69,8 @@  struct DVDemuxContext {
     uint8_t           audio_buf[4][8192];
     int               ach;
     int               frames;
+
+    int64_t           next_pts_video;
 };
 
 static inline uint16_t dv_audio_12to16(uint16_t sample)
@@ -314,8 +316,6 @@  static int dv_extract_video_info(DVDemuxContext *c, const uint8_t *frame)
 
     par = c->vst->codecpar;
 
-    avpriv_set_pts_info(c->vst, 64, c->sys->time_base.num,
-                        c->sys->time_base.den);
     c->vst->avg_frame_rate = av_inv_q(c->vst->time_base);
 
     /* finding out SAR is a little bit messy */
@@ -360,6 +360,8 @@  static int dv_init_demux(AVFormatContext *s, DVDemuxContext *c)
     c->vst->codecpar->bit_rate   = 25000000;
     c->vst->start_time        = 0;
 
+    avpriv_set_pts_info(c->vst, 64, 1, DV_TIMESCALE_VIDEO);
+
     /* Audio streams are added later as they are encountered. */
     s->ctx_flags |= AVFMTCTX_NOHEADER;
 
@@ -463,7 +465,10 @@  int avpriv_dv_produce_packet(DVDemuxContext *c, AVPacket *pkt,
         pkt->size         = size;
         pkt->flags       |= AV_PKT_FLAG_KEY;
         pkt->stream_index = c->vst->index;
-        pkt->pts          = c->frames;
+        pkt->pts          = c->next_pts_video;
+        pkt->duration     = av_rescale_q(1, c->sys->time_base, c->vst->time_base);
+
+        c->next_pts_video += pkt->duration;
     }
 
     c->frames++;
@@ -477,11 +482,12 @@  static int64_t dv_frame_offset(AVFormatContext *s, DVDemuxContext *c,
     // FIXME: sys may be wrong if last dv_read_packet() failed (buffer is junk)
     FFFormatContext *const si = ffformatcontext(s);
     const int frame_size = c->sys->frame_size;
+    int64_t  frame_count = av_rescale_q(timestamp, c->vst->time_base, c->sys->time_base);
     int64_t offset;
     int64_t size       = avio_size(s->pb) - si->data_offset;
     int64_t max_offset = ((size - 1) / frame_size) * frame_size;
 
-    offset = frame_size * timestamp;
+    offset = frame_size * frame_count;
 
     if (size >= 0 && offset > max_offset)
         offset = max_offset;
@@ -494,6 +500,8 @@  static int64_t dv_frame_offset(AVFormatContext *s, DVDemuxContext *c,
 void ff_dv_offset_reset(DVDemuxContext *c, int64_t frame_offset)
 {
     c->frames = frame_offset;
+    if (c->sys)
+        c->next_pts_video = av_rescale_q(frame_offset, c->sys->time_base, c->vst->time_base);
     c->audio_pkt[0].size = c->audio_pkt[1].size = 0;
     c->audio_pkt[2].size = c->audio_pkt[3].size = 0;
 }
@@ -618,7 +626,14 @@  static int dv_read_seek(AVFormatContext *s, int stream_index,
 {
     RawDVContext *r   = s->priv_data;
     DVDemuxContext *c = &r->dv_demux;
-    int64_t offset    = dv_frame_offset(s, c, timestamp, flags);
+    int64_t offset;
+
+    // seek using the video stream
+    if (stream_index != c->vst->index)
+        timestamp = av_rescale_q(timestamp, s->streams[stream_index]->time_base,
+                                 c->vst->time_base);
+
+    offset = dv_frame_offset(s, c, timestamp, flags);
 
     if (avio_seek(s->pb, offset, SEEK_SET) < 0)
         return -1;
diff --git a/tests/ref/seek/lavf-dv b/tests/ref/seek/lavf-dv
index f63e4460be6..95f19d28f03 100644
--- a/tests/ref/seek/lavf-dv
+++ b/tests/ref/seek/lavf-dv
@@ -3,9 +3,9 @@  ret: 0         st:-1 flags:0  ts:-1.000000
 ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:144000
 ret: 0         st:-1 flags:1  ts: 1.894167
 ret: 0         st: 0 flags:1 dts: 0.960000 pts: 0.960000 pos:3456000 size:144000
-ret: 0         st: 0 flags:0  ts: 0.800000
+ret: 0         st: 0 flags:0  ts: 0.788333
 ret: 0         st: 0 flags:1 dts: 0.800000 pts: 0.800000 pos:2880000 size:144000
-ret: 0         st: 0 flags:1  ts:-0.320000
+ret: 0         st: 0 flags:1  ts:-0.317500
 ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:144000
 ret: 0         st: 1 flags:0  ts: 2.560000
 ret: 0         st: 0 flags:1 dts: 0.960000 pts: 0.960000 pos:3456000 size:144000
@@ -15,9 +15,9 @@  ret: 0         st:-1 flags:0  ts: 0.365002
 ret: 0         st: 0 flags:1 dts: 0.360000 pts: 0.360000 pos:1296000 size:144000
 ret: 0         st:-1 flags:1  ts:-0.740831
 ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:144000
-ret: 0         st: 0 flags:0  ts: 2.160000
+ret: 0         st: 0 flags:0  ts: 2.153333
 ret: 0         st: 0 flags:1 dts: 0.960000 pts: 0.960000 pos:3456000 size:144000
-ret: 0         st: 0 flags:1  ts: 1.040000
+ret: 0         st: 0 flags:1  ts: 1.047500
 ret: 0         st: 0 flags:1 dts: 0.960000 pts: 0.960000 pos:3456000 size:144000
 ret: 0         st: 1 flags:0  ts:-0.040000
 ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:144000
@@ -27,9 +27,9 @@  ret: 0         st:-1 flags:0  ts: 1.730004
 ret: 0         st: 0 flags:1 dts: 0.960000 pts: 0.960000 pos:3456000 size:144000
 ret: 0         st:-1 flags:1  ts: 0.624171
 ret: 0         st: 0 flags:1 dts: 0.640000 pts: 0.640000 pos:2304000 size:144000
-ret: 0         st: 0 flags:0  ts:-0.480000
+ret: 0         st: 0 flags:0  ts:-0.481667
 ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:144000
-ret: 0         st: 0 flags:1  ts: 2.400000
+ret: 0         st: 0 flags:1  ts: 2.412500
 ret: 0         st: 0 flags:1 dts: 0.960000 pts: 0.960000 pos:3456000 size:144000
 ret: 0         st: 1 flags:0  ts: 1.320000
 ret: 0         st: 0 flags:1 dts: 0.960000 pts: 0.960000 pos:3456000 size:144000
@@ -39,9 +39,9 @@  ret: 0         st:-1 flags:0  ts:-0.904994
 ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:144000
 ret: 0         st:-1 flags:1  ts: 1.989173
 ret: 0         st: 0 flags:1 dts: 0.960000 pts: 0.960000 pos:3456000 size:144000
-ret: 0         st: 0 flags:0  ts: 0.880000
+ret: 0         st: 0 flags:0  ts: 0.883333
 ret: 0         st: 0 flags:1 dts: 0.880000 pts: 0.880000 pos:3168000 size:144000
-ret: 0         st: 0 flags:1  ts:-0.240000
+ret: 0         st: 0 flags:1  ts:-0.222500
 ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:144000
 ret: 0         st: 1 flags:0  ts: 2.680000
 ret: 0         st: 0 flags:1 dts: 0.960000 pts: 0.960000 pos:3456000 size:144000
diff --git a/tests/ref/seek/vsynth_lena-dv b/tests/ref/seek/vsynth_lena-dv
index d318794157b..afed1fbe727 100644
--- a/tests/ref/seek/vsynth_lena-dv
+++ b/tests/ref/seek/vsynth_lena-dv
@@ -3,49 +3,49 @@  ret: 0         st:-1 flags:0  ts:-1.000000
 ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:144000
 ret: 0         st:-1 flags:1  ts: 1.894167
 ret: 0         st: 0 flags:1 dts: 1.880000 pts: 1.880000 pos:6768000 size:144000
-ret: 0         st: 0 flags:0  ts: 0.800000
+ret: 0         st: 0 flags:0  ts: 0.788333
 ret: 0         st: 0 flags:1 dts: 0.800000 pts: 0.800000 pos:2880000 size:144000
-ret: 0         st: 0 flags:1  ts:-0.320000
+ret: 0         st: 0 flags:1  ts:-0.317500
 ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:144000
 ret: 0         st:-1 flags:0  ts: 2.576668
 ret: 0         st: 0 flags:1 dts: 1.960000 pts: 1.960000 pos:7056000 size:144000
 ret: 0         st:-1 flags:1  ts: 1.470835
 ret: 0         st: 0 flags:1 dts: 1.480000 pts: 1.480000 pos:5328000 size:144000
-ret: 0         st: 0 flags:0  ts: 0.360000
+ret: 0         st: 0 flags:0  ts: 0.365000
 ret: 0         st: 0 flags:1 dts: 0.360000 pts: 0.360000 pos:1296000 size:144000
-ret: 0         st: 0 flags:1  ts:-0.760000
+ret: 0         st: 0 flags:1  ts:-0.740833
 ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:144000
 ret: 0         st:-1 flags:0  ts: 2.153336
 ret: 0         st: 0 flags:1 dts: 1.960000 pts: 1.960000 pos:7056000 size:144000
 ret: 0         st:-1 flags:1  ts: 1.047503
 ret: 0         st: 0 flags:1 dts: 1.040000 pts: 1.040000 pos:3744000 size:144000
-ret: 0         st: 0 flags:0  ts:-0.040000
+ret: 0         st: 0 flags:0  ts:-0.058333
 ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:144000
-ret: 0         st: 0 flags:1  ts: 2.840000
+ret: 0         st: 0 flags:1  ts: 2.835833
 ret: 0         st: 0 flags:1 dts: 1.960000 pts: 1.960000 pos:7056000 size:144000
 ret: 0         st:-1 flags:0  ts: 1.730004
 ret: 0         st: 0 flags:1 dts: 1.720000 pts: 1.720000 pos:6192000 size:144000
 ret: 0         st:-1 flags:1  ts: 0.624171
 ret: 0         st: 0 flags:1 dts: 0.640000 pts: 0.640000 pos:2304000 size:144000
-ret: 0         st: 0 flags:0  ts:-0.480000
+ret: 0         st: 0 flags:0  ts:-0.481667
 ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:144000
-ret: 0         st: 0 flags:1  ts: 2.400000
+ret: 0         st: 0 flags:1  ts: 2.412500
 ret: 0         st: 0 flags:1 dts: 1.960000 pts: 1.960000 pos:7056000 size:144000
 ret: 0         st:-1 flags:0  ts: 1.306672
 ret: 0         st: 0 flags:1 dts: 1.320000 pts: 1.320000 pos:4752000 size:144000
 ret: 0         st:-1 flags:1  ts: 0.200839
 ret: 0         st: 0 flags:1 dts: 0.200000 pts: 0.200000 pos: 720000 size:144000
-ret: 0         st: 0 flags:0  ts:-0.920000
+ret: 0         st: 0 flags:0  ts:-0.905000
 ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:144000
-ret: 0         st: 0 flags:1  ts: 2.000000
+ret: 0         st: 0 flags:1  ts: 1.989167
 ret: 0         st: 0 flags:1 dts: 1.960000 pts: 1.960000 pos:7056000 size:144000
 ret: 0         st:-1 flags:0  ts: 0.883340
 ret: 0         st: 0 flags:1 dts: 0.880000 pts: 0.880000 pos:3168000 size:144000
 ret: 0         st:-1 flags:1  ts:-0.222493
 ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:144000
-ret: 0         st: 0 flags:0  ts: 2.680000
+ret: 0         st: 0 flags:0  ts: 2.671667
 ret: 0         st: 0 flags:1 dts: 1.960000 pts: 1.960000 pos:7056000 size:144000
-ret: 0         st: 0 flags:1  ts: 1.560000
+ret: 0         st: 0 flags:1  ts: 1.565833
 ret: 0         st: 0 flags:1 dts: 1.560000 pts: 1.560000 pos:5616000 size:144000
 ret: 0         st:-1 flags:0  ts: 0.460008
 ret: 0         st: 0 flags:1 dts: 0.480000 pts: 0.480000 pos:1728000 size:144000
diff --git a/tests/ref/seek/vsynth_lena-dv-411 b/tests/ref/seek/vsynth_lena-dv-411
index d318794157b..afed1fbe727 100644
--- a/tests/ref/seek/vsynth_lena-dv-411
+++ b/tests/ref/seek/vsynth_lena-dv-411
@@ -3,49 +3,49 @@  ret: 0         st:-1 flags:0  ts:-1.000000
 ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:144000
 ret: 0         st:-1 flags:1  ts: 1.894167
 ret: 0         st: 0 flags:1 dts: 1.880000 pts: 1.880000 pos:6768000 size:144000
-ret: 0         st: 0 flags:0  ts: 0.800000
+ret: 0         st: 0 flags:0  ts: 0.788333
 ret: 0         st: 0 flags:1 dts: 0.800000 pts: 0.800000 pos:2880000 size:144000
-ret: 0         st: 0 flags:1  ts:-0.320000
+ret: 0         st: 0 flags:1  ts:-0.317500
 ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:144000
 ret: 0         st:-1 flags:0  ts: 2.576668
 ret: 0         st: 0 flags:1 dts: 1.960000 pts: 1.960000 pos:7056000 size:144000
 ret: 0         st:-1 flags:1  ts: 1.470835
 ret: 0         st: 0 flags:1 dts: 1.480000 pts: 1.480000 pos:5328000 size:144000
-ret: 0         st: 0 flags:0  ts: 0.360000
+ret: 0         st: 0 flags:0  ts: 0.365000
 ret: 0         st: 0 flags:1 dts: 0.360000 pts: 0.360000 pos:1296000 size:144000
-ret: 0         st: 0 flags:1  ts:-0.760000
+ret: 0         st: 0 flags:1  ts:-0.740833
 ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:144000
 ret: 0         st:-1 flags:0  ts: 2.153336
 ret: 0         st: 0 flags:1 dts: 1.960000 pts: 1.960000 pos:7056000 size:144000
 ret: 0         st:-1 flags:1  ts: 1.047503
 ret: 0         st: 0 flags:1 dts: 1.040000 pts: 1.040000 pos:3744000 size:144000
-ret: 0         st: 0 flags:0  ts:-0.040000
+ret: 0         st: 0 flags:0  ts:-0.058333
 ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:144000
-ret: 0         st: 0 flags:1  ts: 2.840000
+ret: 0         st: 0 flags:1  ts: 2.835833
 ret: 0         st: 0 flags:1 dts: 1.960000 pts: 1.960000 pos:7056000 size:144000
 ret: 0         st:-1 flags:0  ts: 1.730004
 ret: 0         st: 0 flags:1 dts: 1.720000 pts: 1.720000 pos:6192000 size:144000
 ret: 0         st:-1 flags:1  ts: 0.624171
 ret: 0         st: 0 flags:1 dts: 0.640000 pts: 0.640000 pos:2304000 size:144000
-ret: 0         st: 0 flags:0  ts:-0.480000
+ret: 0         st: 0 flags:0  ts:-0.481667
 ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:144000
-ret: 0         st: 0 flags:1  ts: 2.400000
+ret: 0         st: 0 flags:1  ts: 2.412500
 ret: 0         st: 0 flags:1 dts: 1.960000 pts: 1.960000 pos:7056000 size:144000
 ret: 0         st:-1 flags:0  ts: 1.306672
 ret: 0         st: 0 flags:1 dts: 1.320000 pts: 1.320000 pos:4752000 size:144000
 ret: 0         st:-1 flags:1  ts: 0.200839
 ret: 0         st: 0 flags:1 dts: 0.200000 pts: 0.200000 pos: 720000 size:144000
-ret: 0         st: 0 flags:0  ts:-0.920000
+ret: 0         st: 0 flags:0  ts:-0.905000
 ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:144000
-ret: 0         st: 0 flags:1  ts: 2.000000
+ret: 0         st: 0 flags:1  ts: 1.989167
 ret: 0         st: 0 flags:1 dts: 1.960000 pts: 1.960000 pos:7056000 size:144000
 ret: 0         st:-1 flags:0  ts: 0.883340
 ret: 0         st: 0 flags:1 dts: 0.880000 pts: 0.880000 pos:3168000 size:144000
 ret: 0         st:-1 flags:1  ts:-0.222493
 ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:144000
-ret: 0         st: 0 flags:0  ts: 2.680000
+ret: 0         st: 0 flags:0  ts: 2.671667
 ret: 0         st: 0 flags:1 dts: 1.960000 pts: 1.960000 pos:7056000 size:144000
-ret: 0         st: 0 flags:1  ts: 1.560000
+ret: 0         st: 0 flags:1  ts: 1.565833
 ret: 0         st: 0 flags:1 dts: 1.560000 pts: 1.560000 pos:5616000 size:144000
 ret: 0         st:-1 flags:0  ts: 0.460008
 ret: 0         st: 0 flags:1 dts: 0.480000 pts: 0.480000 pos:1728000 size:144000
diff --git a/tests/ref/seek/vsynth_lena-dv-50 b/tests/ref/seek/vsynth_lena-dv-50
index fae6d1b225d..3b1d69ffa69 100644
--- a/tests/ref/seek/vsynth_lena-dv-50
+++ b/tests/ref/seek/vsynth_lena-dv-50
@@ -3,49 +3,49 @@  ret: 0         st:-1 flags:0  ts:-1.000000
 ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:288000
 ret: 0         st:-1 flags:1  ts: 1.894167
 ret: 0         st: 0 flags:1 dts: 1.880000 pts: 1.880000 pos:13536000 size:288000
-ret: 0         st: 0 flags:0  ts: 0.800000
+ret: 0         st: 0 flags:0  ts: 0.788333
 ret: 0         st: 0 flags:1 dts: 0.800000 pts: 0.800000 pos:5760000 size:288000
-ret: 0         st: 0 flags:1  ts:-0.320000
+ret: 0         st: 0 flags:1  ts:-0.317500
 ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:288000
 ret: 0         st:-1 flags:0  ts: 2.576668
 ret: 0         st: 0 flags:1 dts: 1.960000 pts: 1.960000 pos:14112000 size:288000
 ret: 0         st:-1 flags:1  ts: 1.470835
 ret: 0         st: 0 flags:1 dts: 1.480000 pts: 1.480000 pos:10656000 size:288000
-ret: 0         st: 0 flags:0  ts: 0.360000
+ret: 0         st: 0 flags:0  ts: 0.365000
 ret: 0         st: 0 flags:1 dts: 0.360000 pts: 0.360000 pos:2592000 size:288000
-ret: 0         st: 0 flags:1  ts:-0.760000
+ret: 0         st: 0 flags:1  ts:-0.740833
 ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:288000
 ret: 0         st:-1 flags:0  ts: 2.153336
 ret: 0         st: 0 flags:1 dts: 1.960000 pts: 1.960000 pos:14112000 size:288000
 ret: 0         st:-1 flags:1  ts: 1.047503
 ret: 0         st: 0 flags:1 dts: 1.040000 pts: 1.040000 pos:7488000 size:288000
-ret: 0         st: 0 flags:0  ts:-0.040000
+ret: 0         st: 0 flags:0  ts:-0.058333
 ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:288000
-ret: 0         st: 0 flags:1  ts: 2.840000
+ret: 0         st: 0 flags:1  ts: 2.835833
 ret: 0         st: 0 flags:1 dts: 1.960000 pts: 1.960000 pos:14112000 size:288000
 ret: 0         st:-1 flags:0  ts: 1.730004
 ret: 0         st: 0 flags:1 dts: 1.720000 pts: 1.720000 pos:12384000 size:288000
 ret: 0         st:-1 flags:1  ts: 0.624171
 ret: 0         st: 0 flags:1 dts: 0.640000 pts: 0.640000 pos:4608000 size:288000
-ret: 0         st: 0 flags:0  ts:-0.480000
+ret: 0         st: 0 flags:0  ts:-0.481667
 ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:288000
-ret: 0         st: 0 flags:1  ts: 2.400000
+ret: 0         st: 0 flags:1  ts: 2.412500
 ret: 0         st: 0 flags:1 dts: 1.960000 pts: 1.960000 pos:14112000 size:288000
 ret: 0         st:-1 flags:0  ts: 1.306672
 ret: 0         st: 0 flags:1 dts: 1.320000 pts: 1.320000 pos:9504000 size:288000
 ret: 0         st:-1 flags:1  ts: 0.200839
 ret: 0         st: 0 flags:1 dts: 0.200000 pts: 0.200000 pos:1440000 size:288000
-ret: 0         st: 0 flags:0  ts:-0.920000
+ret: 0         st: 0 flags:0  ts:-0.905000
 ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:288000
-ret: 0         st: 0 flags:1  ts: 2.000000
+ret: 0         st: 0 flags:1  ts: 1.989167
 ret: 0         st: 0 flags:1 dts: 1.960000 pts: 1.960000 pos:14112000 size:288000
 ret: 0         st:-1 flags:0  ts: 0.883340
 ret: 0         st: 0 flags:1 dts: 0.880000 pts: 0.880000 pos:6336000 size:288000
 ret: 0         st:-1 flags:1  ts:-0.222493
 ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:288000
-ret: 0         st: 0 flags:0  ts: 2.680000
+ret: 0         st: 0 flags:0  ts: 2.671667
 ret: 0         st: 0 flags:1 dts: 1.960000 pts: 1.960000 pos:14112000 size:288000
-ret: 0         st: 0 flags:1  ts: 1.560000
+ret: 0         st: 0 flags:1  ts: 1.565833
 ret: 0         st: 0 flags:1 dts: 1.560000 pts: 1.560000 pos:11232000 size:288000
 ret: 0         st:-1 flags:0  ts: 0.460008
 ret: 0         st: 0 flags:1 dts: 0.480000 pts: 0.480000 pos:3456000 size:288000