DTS Digital ..

[Earth[Tera].bin]

Hopefully someone will clear things up for me, as I think I've confused myself.

I have a Xonar D2 and a set of Logitech Z-5500's. So when I play audio or video the control panel tells me the input source is DTS Digital. Now as a lot of the source material is not encoded in DTS, simply mp3s for instance, I assume my Xonar is encoding the source to DTS on the fly, Is this correct?.

You see when I play audio and video within my Linux setup the Z-5500 control panel only displays Pro-Logic II. The hardware setup is the exact same, optical from the Xonar to the Z-5500. Am I to understand it's simply down to Linux ( mplayer/ffmpeg ) being unable to encode on the fly, or am I missing the point altogether?

 

[Phil99]

I don't think the linux drivers can do the encoding (the drivers in linux aren't made by the manufacturer) so can only output stereo, which your decoder is trying to upmix using ProLogic II

 

[Earth[Tera].bin]

Well I finally got a DTS digital output from alsa . Seems I needed to specify the correct codec to use. Also I just realised it was 'dts connect' program in windoos that was actually converting all my PC audio formats into DTS.

update: AC3/DTS passthrough and on-the-fly AC3 encoding for 6 channel AAC files in Linux using this post.