Comment #14 on issue 17174 by gmaxwell: Theora block-level quant not  
supported
http://code.google.com/p/chromium/issues/detail?id=17174

Please also try:  
http://people.xiph.org/~tterribe/tmp/sign_irene_cif-3qi-b.ogg

The first example is all I-frames, this video is more typical.  You can  
also grab the
ffmpeg2theora nighties.

Unfortunately ffmpeg doesn't use the libtheora reference code and ffmpeg's  
support
appears to have mostly been written against what was found in the wild  
rather than
the Theora spec. The intersection of ffmpeg experts and theora experts is  
nearly, but
not quite, the empty set. :(   I'll go nag the person who did this fix.

To the best knowledge of the Theora developers the current support in  
ffmpeg mainline
works for all the files thrown at it except: It only handles 4:2:0 chroma  
subsampling
(Theora also allows 4:2:2 and 4:4:4), and the offset parameter is not  
handled
correctly (so you will get colored lines along the borders of some videos).  
FFMpeg's
theora decoder is also substantially slower than the reference encoder,  
though it has
gotten somewhat better recently.


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