For CINAVIA DRM "infected" MKV files with a DTS audio stream this is a supplemental fix to add to yakos' post if PMS doing the AC3 re-encode doesn't work. (which seems to be the case)1) Follow the guide 2 posts up (VERY SIMPLE, and thank you for the post/link Yakos)
2) Download and install MKV2VOB
http://www.mkv2vob.com/showthread.php?tid=13) Go to Configuration Tab
4) Select Video Transcoding "
Never" (ignore the warning)
5) Select/tick "
Always transcode DTS"
6) Run the file thru MKV2VOB
This will simply remux the MKV with a re-encoded audio stream (from DTS to AC3) into a PS3 native MPG w/AC3 (no transcode required to stream with PMS

). The DTS-->AC3 re-encode takes about 5-10 minutes MAX with a full length movie, then MKV2VOB will remux the new AC3 audio with the untouched video stream (another 5 or so minutes). This will leave you with an AC3 track instead of DTS, but it will still be at 640kbps or 448kbps if you so choose, and will now work. Better than the file not working because it's infected.
Of course for you MKV2VOB users out there, you would need to change back any settings to use it for it's usual purpose.
EDIT: I can confirm that this does in fact work for my copy of The Losers w/DTS audio
With M2TS files that have DTS, I would simply add another step between step 1 and 2. Use MKVMERGE (version 3.4.0 or older)to remux the M2TS to an MKV (this allows compatibility to MKV2VOB) Then add that file to MKV2VOB and continue on with steps I provided.
SO with M2TS file format w/DTS that are Cinavia DRM protected..1) Again, follow suggestion 2 posts up by Yakos
2) Download and install MKVToolnix 3.4.0 or older
http://www.bunkus.org/videotools/mkvtoolnix/win32/3) Add the "infected M2TS" file to MKVmerge and remux to an MKV file (about 5-10 minutes max)
4) Add the MKV to already installed MKV2VOB and follow the MKV2VOB suggestions I laid out.
These steps may be "too much" for some people. If you fall into this category, I suggest then, as I always have, to find sources that DO NOT have CINAVIA DRM if this is too much, but doing so will require time to search for and download a new Cinavia DRM free file (these "infection" free files are available online from many release groups). My steps take around or less than half an hour to get playable, Cinavia DRM free files, and save users from having to find their own DTS fix.
MP4's should never have DTS for an audio stream, as well I have never seen AVI with DTS as of yet so my suggestions, combined with the link Yakos provided SHOULD eliminate MOST Cinavia DRM issues out there.Of course FOOBAR 2000 has a DTS decoder that works quite well, but I have not devised an easy to follow system for this route just yet.
GOOD LUCK TO ALL.