[MEncoder-users] Demuxing and 6 channel ac3 audio

belcampo belcampo at zonnet.nl
Mon Mar 9 20:19:00 CET 2009

L Lee wrote:
> I'm trying to simplify a process I'm using for transcoding some interlaced
> AVCHD files to 24 fps mpeg-2 for saving to DVD video.
> (See http://thread.gmane.org/gmane.comp.video.mencoder.user/9689/focus=9790)
> I'm using several open source applications to do the job, and I'm relying on
> mencoder to accomplish the transcoding of the video. I haven't found it
> necessary to modify the audio, so I'm separating audio and video before
> encoding. The source audio is 6 channel ac3.
> Is there a way to perform the mencoder video encoding step so that the
> mencoder output is recognized as a video stream with no audio (a la .m2v) by
> mplex so that I don't have to run an additional demuxing operation on it?
> I've tried using the -demuxer option as well as specifying the ".m2v" name
> extension for the output, but all methods I've used to determine the format
> of the results report muxed video even though no audio stream is present.
mencoder source.mpg -oac copy -ovc copy -of rawvideo -o 
> If not, how can I use mencoder to transcode the original muxed source to
> preserve 6 channel audio? So far I've only tried these audio options: -oac
> lavc copy and -oav lavc lavcopts abitrate=256 (I've tried 320 and a couple
> of other bitrate settings for lavcopts also, including the original 384).
> The audio output always contains only 2 channels.
> Also, what kinds of extra steps are involved in making standards-compliant
> DVD video using 24 fps sources rather than 25 or 30 fps? I always get a
> warning about it when using dvdauthor, although I'm able to play the
> resulting DVDs with good results using the two means most immediately
> available to me, my set top DVD player and computer.
> Thanks.
> Laine Lee
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