[MEncoder-users] HDTV transcode loses 5.1 ac3 Audio
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Mon Sep 1 03:01:58 CEST 2008
On Sat, 30 Aug 2008, Dan Shoup wrote:
> Mencoder.exe -i "E:\Dir\filename.mpg” -of avi -oac copy -ovc xvid
> -xvidencopts fixed_quant=4 -vf scale=1024:576 -o “E:\Dir\filename.avi”
> This works, but I only get 2-channel audio. I have also tried adding
> "–channels 6"
The -channels option isn't meaningful with the framecopy "encoder."
-oac copy merely copies the audio stream without alteration. If it's
6-channel in, you should get 6-channel out, and I don't see how mencoder
could do otherwise.
> MEncoder dev-SVN-rUNKNOWN-4.2.1-sjlj (C) 2000-2007 MPlayer Team
Hmm, that's not good. Not only is it an older mencoder version, but we've
no clue as to which version it is...
> AUDIO: 48000 Hz, 2 ch, s16le, 384.0 kbit/25.00% (ratio: 48000->192000)
> audiocodec: framecopy (format=2000 chans=2 rate=48000 bits=16 B/s=48000
> sample-1 )
I think you can safely ignore these messages. liba52, by default,
downmixes to two channels, which affects the information it returns about
a stream (the number of channels is a bit of an abstraction with AC3).
However, you're not decoding the stream, just copying it. If you play the
resulting file with mplayer -channels 6, you should get your six-channel
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