[libav-bugs] [Bug 385] New: Converting a video to webm (libvpx, libtheora) alters the duration

bugzilla-daemon at aruru.libav.org bugzilla-daemon at aruru.libav.org
Thu Oct 25 10:55:34 CEST 2012


https://bugzilla.libav.org/show_bug.cgi?id=385

           Summary: Converting a video to webm (libvpx, libtheora) alters
                    the duration
           Product: Libav
           Version: git HEAD
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: utilities
        AssignedTo: bugzilla at libav.org
        ReportedBy: desantis.maurizio at gmail.com


On an Ubuntu 12.10 x64, avconv compiled from git master

Some videos I have, when converted to webm, have an altered duration. Not all
videos, just some, but I didn't understand why just some.

This doesn't happen with avconv from the distro package (libav-tools), which
sets the right duration.

I attach the input video to this report.


avprobe of the input:
avprobe version a6e9d64, Copyright (c) 2007-2012 the Libav developers
  built on Oct 25 2012 10:27:35 with gcc 4.7 (Ubuntu/Linaro 4.7.2-2ubuntu1)
[flv @ 0x1c60860] max_analyze_duration reached
Input #0, flv, from 'input.flv':
  Metadata:
    starttime       : 0
    totalduration   : 38
    totaldatarate   : 521
    bytelength      : 2482952
    canseekontime   : true
    sourcedata      : B400F7E0AHH1348065349856294
    purl            : 
    pmsg            : 
    encoder         : Lavf53.21.0
  Duration: 00:00:38.17, start: 0.000000, bitrate: N/A
    Stream #0.0: Video: flv, yuv420p, 426x240, 200 kb/s, 29.97 fps, 29.97 tbr,
1k tbn
    Stream #0.1: Audio: adpcm_swf, 44100 Hz, 1 channels, s16, 176 kb/s
# avprobe output


avprobe of the output:
avprobe version a6e9d64, Copyright (c) 2007-2012 the Libav developers
  built on Oct 25 2012 10:27:35 with gcc 4.7 (Ubuntu/Linaro 4.7.2-2ubuntu1)
Input #0, matroska,webm, from 'output.webm':
  Duration: 00:00:39.12, start: 0.000000, bitrate: N/A
    Stream #0.0: Video: vp8, yuv420p, 426x240, PAR 1:1 DAR 71:40, 1k fps, 1k
tbr, 1k tbn (default)
    Stream #0.1: Audio: vorbis, 44100 Hz, mono, s16 (default)
# avprobe output


Output of LD_LIBRARY_PATH=/opt/libav/lib /opt/libav/bin/avconv -y -v 9
-loglevel 99 -i input.flv output.webm :
http://pastebin.com/VLBKU6zp

(I didn't paste the output right here because when submitting the bug I was
blocked by a message which sad "Comment cannot contain more the 65365
characters", something like this)

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