[FFmpeg-trac] #1186(avformat:new): Regression in duration calculation for ogg files.

[FFmpeg]

#1186: Regression in duration calculation for ogg files.
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             Reporter:  dalecurtis  |                     Type:  defect
               Status:  new         |                 Priority:  normal
            Component:  avformat    |                  Version:  git-master
             Keywords:              |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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 Commit
 http://git.videolan.org/?p=ffmpeg.git;a=commitdiff;h=5901cd6236d97b34fe59a47ba0fd6da8f647d1f1
 introduced a significant regression in the duration calculation for some
 OGG files:

 http://commondatastorage.googleapis.com/dalecurtis-shared/sync1.ogg
 http://commondatastorage.googleapis.com/dalecurtis-shared/sync2.ogg

 Chrome's copy of FFmpeg has had this commit reverted for some time now w/o
 issue. I couldn't find an upstream issue report for this though, so
 decided to file this bug.

 The issue can be seen by running ffplay on either file above and noting
 that the duration is nearly 5 secs off (25.36 vs 30.35)

 dalecurtis at xorax /d/code/chrome/src $ ffplay -autoexit
 media/test/data/content/sync1.ogg
 ffplay version N-39514-gfde6314 Copyright (c) 2003-2012 the FFmpeg
 developers
   built on Apr  4 2012 11:24:39 with gcc 4.4.3
   configuration: --enable-libx264 --enable-libvpx --enable-gpl --enable-
 ffplay
   libavutil      51. 44.100 / 51. 44.100
   libavcodec     54. 12.100 / 54. 12.100
   libavformat    54.  3.100 / 54.  3.100
   libavdevice    53.  4.100 / 53.  4.100
   libavfilter     2. 66.101 /  2. 66.101
   libswscale      2.  1.100 /  2.  1.100
   libswresample   0. 10.100 /  0. 10.100
   libpostproc    52.  0.100 / 52.  0.100
 Input #0, ogg, from 'media/test/data/content/sync1.ogg':
   Duration: 00:00:25.36, start: 0.000000, bitrate: 6 kb/s
     Stream #0:0: Audio: vorbis, 44100 Hz, mono, s16, 80 kb/s
   30.35 A-V:  0.000 fd=   0 aq=    0KB vq=    0KB sq=    0B f=0/0

 Dropping the commit above (and subsequent changes to that commit) fixes
 this regression, seemingly without issue:

 Input #0, ogg, from
 '/d/code/chrome/src/media/test/data/content/sync1.ogg':
   Duration: 00:00:29.99, start: 0.000000, bitrate: 5 kb/s

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1186>
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