OMG Thank you so much for this thread! I've been stressing out 'cause my recent .mkv animes have been stuffing up, and I noticed it was only at the OP&ED parts.
I was using VLC but now that I've got CCCP they're fine! I <3 U
Don't know if it'll do much but +Rep for you.
Time to re-watch my anime...I missed out on quite a bit.