www.makemkv.com

I've been having trouble playing back an mkv created from the Blu Ray version of Wedding Crashers made with MakeMKV. When I open the file with VLC I get a message which reads. VLC does not support the audio or video format "undf". Unfortunately there is no way for you to fix this. The movie then starts with sound, but the video is very choppy. Almost like every once and a while the video goes back about ten frames, so everything is constantly stuttering.

Any ideas?

Never mind, it turns out Wedding Crashers was encoded with VC-1, so this bug has already been documented. The fix worked for me.