[MEncoder-users] Transcoding challenge

[Grozdan]

On Tuesday 10 February 2009 20:53:15 Jon Drukman wrote:
> Here is a sample file recorded from the Apple's built in camera using
> the "Photo Booth" application.  It plays fine in mplayer, Quicktime
> Player, VLC, etc.
>
> http://s3.thismoment.com/test.mov
>
> The ultimate goal is to produce a converted video that contains H.264
> video and AAC audio, compatible with the Apple iPhone and a web-based
> flash player.  I have been unable to generate a file that maintains a/v
> sync.
>
> Here is my basic command line:
>
> mencoder test.mov -o test.mp4 -of lavf -oac lavc -ovc lavc -lavcopts
> vcodec=libx264:mbd=1:vbitrate=640:acodec=libfaac

do not use the lavf muxer as mencoder is currently broken when used with it. 
Instead output to AVI and then remux with MP4Box

your settings are also a bit odd. Use instead

-ovc x264 -x264encopts 
bitrate=640:me=umh:subq=7:frameref=2:nocabac:no8x8dct:bframes=0:level_idc=30

if you still get a/v problems, add -mc 0 -noskip somewhere in the mencoder 
line

>
> The end output always contains something like:
> Video stream:  640.591 kbit/s  (80073 B/s)  size: 1381950 bytes  17.258
> secs  252 frames
>
> Audio stream:  105.388 kbit/s  (13173 B/s)  size: 233392 bytes  17.717 secs
>
> Notice how the video and audio stream lengths differ by almost 1/2 a
> second.
>
> I've tried various muxers, combinations of harddup, ofps, fps, etc...
> with no luck.  I am using MEncoder SVN-r28446-4.0.1.
>
> -jsd-
>
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