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.