[Mplayer-users] a question about playing the audio from a dvd

Arpi arpi at thot.banki.hu
Wed Aug 22 23:51:07 CEST 2001


> I feel, dvd playing is not the future in linux, and really thank You
> all! :) Very cool work! The truth is it's working well about 2-3 weeks
> ago (for me)- with mplayer of course :)
> But my question is about the dolby digital audio's:  
> I've got a sound card with optical output (im not using, yet)- my 
> driver's README says spdif is supported.
> So my question is: how  mplayer plays the dvd sounds???? 
> I know my soundcard is _only stereo_ under linux :(.My only chance
> for the dolby feeling is the optical output :) 
> Mplayer gives only a stereo signal to the sound card, or the full
> signal(including ac-3, if exists) to /dev/dsp, from dvds, or ac-3
> included movie files??? 

by default, mplayer decodes AC3 by software and downmix to stereo.
if you have:
- soundcard with Ac3 passthrough capability to digital out (sp/dif)
- soundcard driver supporting AFMT_AC3 (currently only sb live, afaik)
- and hardware ac3 decoder connected to soundcard's digital out
then you can try mplayer option -ac hwac3 to enable this feature.
but it is not finished/tested stuff, may not work well or at all
(i can't test it, i have no hardware ac3 decoder)

A'rpi / Astral & ESP-team

mailto:arpi at thot.banki.hu

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