[MPlayer-users] Extremely async after transcoding.

[The Wanderer]

Guillaume POIRIER wrote:

> Hi,
> 
> On 2/21/06, Rainer Hantsch <office at hantsch.co.at> wrote:
> 
>> Hi,
>> 
>> sometimes I get very strange avi files, where mplayer continuously
>> reports duplicate frames. The last one was a recording of
>> Enterprise made with virtualdub.
>> 
>> Normally, I use one and the same script I made months ago to
>> transcode everything into good plain DivX4, which plays then fine,
>> but here I encountered the phenomen that audio and video run out of
>> sync nearly in 1:2 relation! So it appears as when this skipped
>> frames (during re-encoding) shorten the video to "half the length",
>> while audio plays the full length.
>> 
>> I hope you can imagine what I mean.
>> 
>> My question is: how can I fix this? Is this known and can be
>> corrected by some command line options of mencoder?
> 
> Did you add "harddup" at the end of your video filter chain?
> 
> Other than that, check if you avi file has a variable bitrate. It may
> be the problem. In that case, I _think_ you have to set -fps and
> -ofps according to you source.

ITYM "variable framerate". If you don't, I'd be interested in hearing
about it - non-VBR video streams isn't a concept that is making much
sense to me.

-- 
       The Wanderer

Warning: Simply because I argue an issue does not mean I agree with any
side of it.

Secrecy is the beginning of tyranny.