I recently downloaded an album in DTS 5.1 (48kHz, 16-bit), which I want convert to an iTunes-friendly format, without data loss. From what I can tell, ALAC seems to be what I need.
I managed to convert the DTS files to 5.1 FLAC using MediaCoder (http://mediacoder.sourceforge.net/index.htm which seems to be awesome, btw). Now I just need to convert 5.1 FLAC to 5.1 ALAC. I thought this would be easy, but dbPowerAmp says it only supports mono/stereo ALAC encoding.
What can I use to encode 5.1 ALAC?
I think the ALAC format is limited to mono and stereo recordings. You can convert to a 5.1 AAC file that will work with iTunes but I don't think ALAC can go up to 5.1. That might be added in the future though or I could be wrong.