[theora] ffmpeg2theora 0.25 synchronization issues when converting from .mov

Jason Self jason.self at gmail.com
Thu Oct 1 19:04:06 PDT 2009

On Oct 1, 2009, at 5:26 PM, Christopher Blizzard wrote:

> Yeah, we really need a corpus of files to test against - especially  
> the weird stuff.

I'll provide links to some of the material. Hopefully others can  
provide their samples.

Here are some examples where the audio and video are not in sync. With  
the exception of Kung Fu Panda, these came from my local television.  
Kung Fu Panda came from a DVD.


Anyone & everyone: Feel free to download away: Bandwidth is not an  

Some have said that it is necessary to manually set the input and  
output framerates for videos such as panda.vob, but doing that doesn't  
always work as the file bb_2.mpg will show. I can also provide an  
example of a file reports the correct framerate but still gets out of  
sync later on (leno_small.mpg.) It seems to get out of sync around the  
10 minute mark for some reason.

Really, I think that ffmpeg2theora should be able to correctly work  
with these files (report the correct framerate, and keep lip-sync as  
well as any DVD player could.) For whatever it's worth, HandBrake has  
no issue with any of these files, despite them also using components  
from the FFmpeg project.

I'm sure that I could provide more files if needed.

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