[theora] Impossible to encode this file in sync

[®om]

Le lundi 22 février 2010 à 17:06 -0500, xiphmont at xiph.org a écrit :
> On Fri, Feb 19, 2010 at 3:46 PM, ®om <rom at rom1v.com> wrote:
> > Le vendredi 19 février 2010 à 15:11 -0500, xiphmont at xiph.org a écrit :
> >> Any chance of a look at the original you're trying to transcode?
> >> Nearly all sync problems are 'the transcoder is losing some critical
> >> piece of timing information'.
> >>
> >> Monty
> >> Rogue Mplayer Ninja
> >> Xiph.Org
> >
> > The original file is here :
> > http://dl.rom1v.com/noindex/test.mpg
> 
> The file has a substantial initial A/V offset (almost 1.5 seconds).
> Mplayer requires about eight seconds of playback before it finally
> locks on. y4oi can sync it, though it has to pad alot of black frames
> at the start.
> 
> My guess is that ffmpeg sees that initial offset and assumes it too
> big to deal with for some reason, or decides not to use the transport
> PTS at all.
> 
> Monty

Thank you for your comments.

In your opinion, is there a way to encode it in theora in sync? Maybe
transmuxing or doing any preparation on the input file before encoding
in theora?

What do you think?