https://bugzilla.wikimedia.org/show_bug.cgi?id=23402

--- Comment #1 from Tim Starling <tstarl...@wikimedia.org> 2010-05-05 00:38:43 
UTC ---
Kbm_telemark_carving_apex1.ogv and Mount_Saint_Helens-ffmpeg-600-1920x1080.ogg
hit a bug in oggThumb where the page size is slightly larger than the page size
in the test files Greg sent me to test large page size handling. I've committed
a fix and it can be deployed soon.

Rockerbll_web_Test.ogg is a 25 second Theora stream multiplexed with a 36m56s
Vorbis stream, so it's not surprising that it has trouble getting a Theora
snapshot at the 18 minute mark.

I also found Bb_bamboo_isle.mpg.vbr1400.80.8to91.theme.ogv which has been cut
down in duration with a buggy tool, possibly oggz chop, which has left it with
a damaged skeleton stream and no EOS marker on any of its three streams. 

Instead of reopening this bug every time you see a thumbnailing failure, I
would suggest at least running "oggz validate" on the file to test for common
encoding errors. To test for mismatched lengths in multiplexed files, you can
use oggSplit from oggvideotools, followed by oggz info.

We could have MediaWiki display such validation information based on the PEAR
File_Ogg scan, but that should be filed as a separate feature request.

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