[MPlayer-users] -oac copy results in out of sync audio with mencoder ?

[a a]

It seems that running mkvmerge as a second pass fixes the issue

mkvmerge -o x.mkv  in.avi
-
no clue why but sounds like an issue with the keyframes ? The new file is marginally smaller (about 1%).



--- On Sun, 2/5/12, a a <you2bepie at yahoo.com> wrote:

From: a a <you2bepie at yahoo.com>
Subject: Re: [MPlayer-users] -oac copy results in out of sync audio with mencoder ?
To: "feature requests bug reportsMPlayer usage questions" <mplayer-users at mplayerhq.hu>
Date: Sunday, February 5, 2012, 7:05 AM

I'm not sure if I understand what hte second pass is doing here;but if I use pcm or anything but copy for oac then the audio is in sync. Its only when I try to copy the audio that it ends up out of sync. 

I can't get mencoder to just copy the video; but I was thinking I could use mkvextra and merge to insert the original audio track.

Still I don't understand why the copy ends up with the audio out of sync :(


--- On Sat, 2/4/12, Ron Johnson <ron.l.johnson at cox.net> wrote:

From: Ron Johnson <ron.l.johnson at cox.net>
Subject: Re: [MPlayer-users] -oac copy results in out of sync audio with mencoder ?
To: "MPlayer usage questions, feature requests, bug reports" <mplayer-users at mplayerhq.hu>
Date: Saturday, February 4, 2012, 11:59 PM

On 02/04/2012 03:10 PM, a a wrote:
> noskip doesn't seem to help - i used this command line:
> 
> 
> mencoder in.mkv -mc 0 -noskip -oac copy -ovc x264 -x264encopts preset=slow:tune=film:crf=15:frameref=15:fast_pskip=0:threads=auto:bitrate=2000 -nosub -vf scale=1280:-10 -of avi -o x.avi
> 
> Appreciate any other suggestions you might have.
> 

When converting MJPEG .mov files to DVD-compatible MPEG2 files, I was faced with a similar problem.  The solution was a 2-step conversion:


VCODEC="vcodec=mpeg2video:aspect=4/3:vbitrate=6000:trell:nr=100"
mencoder \
    *.mov \
    -o ${FOO}.avi \
    -ovc lavc -lavcopts $VCODEC \
    -oac pcm -channels 1 -srate 8000

ffmpeg -i ${FOO}.avi -target ntsc-dvd ${FOO}-0.0.mpeg

This example is tuned to my specific circumstance, but should be adjustable to yours.

-- How does being physically handicapped make me Differently-Abled?
What different abilities do I have?
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