PS3 Showtime Media Player Repack v3.3.366 Changelog:
Autobuild fixes for ps3
Updates for autobuild system
glw: glt_url is always set, don't worry about anything else
glw: Fix linked list corruption causing UI freeze
Fix the broken 1088 -> 1080 fix
Drop stray printf
Fix bug causing incorrect rendering of text in GLW UI
Add support for UTF-16 SRT
Only consider SRT subs if rest of filename matches with movie filename.
VDPAU: Use shaders for scaling instead of the VDPAU mixer
Stay tuned for more PS3 Hacks and PS3 CFW news, follow us on Twitter and be sure to drop by the PS3 Hacks and PS3 Custom Firmware Forums for the latest PlayStation 3 scene updates and homebrew releases!
MKV DOES in fact play, the resolution and video quality itself is near perfect, if not perfect. But the rendering speed is quite slow, and the audio goes faster than the video causing it to go out of sync immediately. Also, subtitles are not supported.