I saw this on a Debian mailing list and maybe you may help: ---------- Forwarded message ---------- From: Bob <[EMAIL PROTECTED]> Date: Oct 11, 2007 5:15 AM Subject: Re: Simultaneous AC3/DTS passthrough & stereo analog output To: debian-user@lists.debian.org
Andrew Sackville-West wrote: > On Tue, Oct 09, 2007 at 09:39:41AM +0100, Bob wrote: > >> Bob wrote: >> >>> I'm using an Audigy2 in one PC and an SB Live value in another and I >>> output to a 5.1 speaker system over S/PDIF coax and to my headphones (via >>> the TV) over analogue stereo. >>> >>> I have AC3 passthrough working when I call mplayer with -afm hwac3, (I >>> think DTS will work but can't find a test clip) and I can soft decode and >>> downmix the AC3 audio with -afm liba52, so that's all great, except that >>> with -afm liba52 rear left and right are mixed and I don't get anything >>> out of the LFE track. >>> >>> What I can't do is both at once which would make life easer for SWMBO. >>> > > I haven't followed this thread and frankly have not much idea what > you're talking about here, but maybe pulseaudio can do what you need? > just a thought. > Thanks for your suggestion, on investigation it appears that PulseAudio cannot do AC3 pass through, I may be able to get it to work by having mplayer output 6 channel PCM, splitting it, downmixing one stream to stereo and outputting it to the analog output and using a real time software AC3 encoder to re-encode the second stream then outputting that to S/PDIF. There would be quite a quality/performance penalty though, particularly at low volume. I'd like to output the raw unadulterated AC3 / DTS as it came of the DVD to S/PDIF and a downmixed stereo version to analog. I've been fruitlessly searching the MythTV mailing list as this crops up fairly regularly over there. Oh well, guess it's not possible, it's funny, usually a product implemented in software gives you more flexibility than a dedicated hardware version but my cheep consumer DVD player automatically does this. Thank you for you time. -- my place on the web: floss-and-misc.blogspot.com -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
