[theora] Impossible to encode this file in sync

xiphmont at xiph.org xiphmont at xiph.org
Mon Feb 22 14:06:34 PST 2010

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.


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