gotsent!

MKVToolnix is a set of tools to create, alter and inspect Matroska files under Linux, other Unices and Windows. They do for Matroska what the OGMtools do for the OGM format and then some. The latest builds now have the ability to create WebM compliant Files.

SmartLabs tsMuxeR – the software utility to create TS and M2TS files for IP broadcasting as well as for viewing at hardware video players (i.e., Dune HD Ultra, Sony Playstation3 and others).

Converts mkv files and srt subtitles into a format readable by the Playstation 3. Doesnt exist for Mac. Doesnt encode but just does "muxing" so is much faster than the Video Converters for Mac that I have tested