[MEncoder-users] At wit's end - MEncoder can't keep AV sync, others can

[Reimar Döffinger]

On Thu, May 20, 2010 at 09:05:00AM -0700, Steve West wrote:
> * Stream copy both:
>   mencoder.exe input.vob -oac copy -ovc copy -o output1.avi
>   Result: output1.avi A/V sync NOT broken+no audible skipping.
> 
> * Encode video, stream copy audio:
>   mencoder.exe input.vob -ofps 29.97 -vf scale=640:480,denoise3d,softskip,harddup -oac copy -ovc x264 -x264encopts bitrate=1200:pass=1 -o nul
>   mencoder.exe input.vob -ofps 29.97 -vf scale=640:480,denoise3d,softskip,harddup -oac copy -ovc x264 -x264encopts bitrate=1200:pass=2 -o output2.avi
>   Result: output2.avi A/V sync NOT broken+no audible skipping.
> 
> * Encode audio, stream copy video:
>   mencoder.exe input.vob -af volnorm=1 -oac mp3lame -lameopts abr:br=192 -srate 32000 -ovc copy -o output3.avi
>   Result: output3.avi A/V sync BROKEN + audible skipping.
> 
> Aha, the AC3.

That sounds more like mp3 encoding causes problems. Tried encoding to mp2 audio
with the FFmpeg encoder (just for comparison), or to MP3 or vorbis via the
warppers from FFmpeg instead of directly with mp3lame?