[MPlayer-users] Demuxing without decoding?
bugfood-ml at fatooh.org
Wed Mar 19 20:02:09 CET 2003
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> I just managed to install MPlayer with the help of a friend (I am a
> Linux-Newbie, and for the time being only run it as a virtual machine
> in a laptop under XP... *^%&$*"£&^ ) and now that it works I actually
> wonder about one thing I am hoping to find an answer for here:
> I installed MPlayer to rip the audio from my DVDs to listen to some
> concerts while driving or walking in the park etc. Obviously I would
> like to have a good quality of sound to satisfy all environments. Now I
> don't know much about computers but I know a little bit about
> compression and I know that second or third generations of coding and
> decoding don't do the signal much good. What I would like to know is
> whether MPlayer is actually just demuxing the streams from the DVD
> when told to dump the stream to ac3 or whether it decodes and then
> recodes it on the way? If the latter were the case I'd rather rip it to
> wav-files, but if not, then I am obviously happy to dump the ac3 and
> then extract the stereo mpeg signal form there (ooops - is that
> possible? ac3 is new to me as well...)
> Well, I would be very gratefulfor any lights shone on these slightly chaotic questions!
What command are you using to extract the ac3?
In any case, it might not matter. If you're planning to re-encode to
vorbis or mp3, then decoding to an interim wave file is a necessary
step (some encoders do this transparently). So, if you want to make
an mp3 or ogg, then this will probably work best for you:
$ mplayer -dvd 1 -vc dummy -vo null -hardframedrop -ao pcm -aofile \
and then use oggenc or lame or whatever on audio.wav.
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