[Matroska-users] mkv makes artifacts in theora stream. Examples.

IL'dar AKHmetgaleev akhilman at gmail.com
Thu Aug 9 06:23:35 CEST 2007


hello again!

I made small example files which shows problem.

http://akhil.nightmail.ru/tmp/mkv_theora/test.ogg (76KB)
This is source ogg-theora file made with ffmpeg2theora 0.18 with -v 0

http://akhil.nightmail.ru/tmp/mkv_theora/test.mkv (81KB)
This is mkv-theora remuxed with mkvmerge v2.0.2

VLC can't open this video:
[00000259] mkv demuxer error: unknow codec id=`V_THEORA'
[00000262] main decoder error: no suitable decoder module for fourcc
`undf'. VLC probably does not support this sound or video format.
[00000241] main playlist: nothing to play
[00000241] main playlist: stopping playback

http://akhil.nightmail.ru/tmp/mkv_theora/shot0001.png (52KB)
http://akhil.nightmail.ru/tmp/mkv_theora/shot0002.png (66KB)
And this is how mplayer shows video in mkv-theora
but source ogg plays without any problems.

ffplay plays this video with same artifacts:
[matroska @ 0xb7f47510]Ignoring seekhead entry for ID=0x1549a966
[matroska @ 0xb7f47510]Ignoring seekhead entry for ID=0x1654ae6b
[matroska @ 0xb7f47510]Ignoring seekhead entry for ID=0x114d9b74
[matroska @ 0xb7f47510]Unknown entry 0x73a4 in info header
[matroska @ 0xb7f47510]Unknown track header entry 0x55aa - ignoring
[matroska @ 0xb7f47510]Unknown track header entry 0x23314f - ignoring
[matroska @ 0xb7f47510]Unknown track header entry 0x55ee - ignoring
[matroska @ 0xb7f47510]Unknown track header entry 0xaa - ignoring
[theora @ 0xb7de00a8]Theora bitstream version 30200
[theora @ 0xb7de00a8]584 bits left in packet 81
[theora @ 0xb7de00a8]7 bits left in packet 82
[theora @ 0xb7de00a8]Theora bitstream version 30200
[theora @ 0xb7de00a8]584 bits left in packet 81
[theora @ 0xb7de00a8]7 bits left in packet 82
But in longer video files ffplay shows even more artifacts then mplayer.

http://akhil.nightmail.ru/tmp/mkv_theora/images.tar.bz2 (136KB)
Uncompressed image sequence of this video.

-- 
Чтв Авг  9 12:07:06 KRAST 2007
Thu Aug  9 04:07:06 UTC 2007
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Ахметгалеев Ильдар aka AkhIL
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