[MEncoder-users] Video and Audio async

[Tobias Brockamp]

Sorry, but this does not solve my problem. I still have different  
length of video and audio.
Just for consideration, i tried to import an AVI-File into iMovie on  
my Mac, i then export the
movie for the iPod. The video file i get is 100%sync, audio and video  
have the same lenght.
I know that iPod is mp4/h264/aac but i also have the problem with  
this codecs over ffmpeg
or mencoder.

Also interesting is that when i import an AVI which has different  
length for video and audio
into iMovie and export it. The resulting video is 100% sync again.  
Why can't ffmpeg or mencoder
do that? Or do they? When yes, pleaaaaase tell me how!


Am 21.03.2007 um 17:58 schrieb larrystotler at netscape.net:

> -----Original Message-----
> From: rcooley at spamcop.net
>
>> This is very bad advice.
>> Your command-line completely throws away the MP3 audio, and you'll  
>> end
> up with audio directly copied from the source file anyhow.
>
> I screwed up.  You're right, that was wrong, it should have been:
>
> mencoder input.avi -oac mp3lame -ovc -copy -mc 0 -ofps 25 -o input- 
> mp3-copy.avi
>
> mencoder input-mp3-copy.avi -oac copy -ovc xvid -xvidencopts  
> pass=1:turbo -mc 0 -ofps 25 -o output.avi
>
> mencoder input-mp3-copy.avi -oac copy -ovc xvid -xvidencopts  
> pass=2:bitrate=300 -mc 0 -ofps 25 -o output.avi
>
> I forgot to change the filename for the 2nd and 3rd passes.  This  
> way, you are doing the mp3lame re-encode one the first pass, then  
> using that output file to do the second and third passes.  Sorry  
> about that.  I had a feeling I had done that one wrong.  Good catch.
>
> As for doing the third pass with the audio, I was doing that, but I  
> have had some issues with the output file having the wrong aspect.   
> On some machines the aspect is played fine and on others it's  
> changed to 1.50:1 for both 1.78:1 and 1.33:1.  Not a big deal on a  
> wide screen, just an extra set of slightly lighter shaded black  
> bars.  But on a fuill screen, it crops the file.  Does it on lots  
> of different versions of mencoder/mplayer for some reason.   
> Generally, when doing a movie, the audio is always smaller with  
> mp3lame, but on shorter episodes like say Spongebob, it's not.
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