Hi, I've been backing up my blurays to my new rMBP using MKV and Handbrake. I done this back in 2008 with my DVDs before I deployed to Iraq, so that I could have my movies without taking them with me physically. I'm just getting back into it now. I've backed up a couple with no problems. I set it to convert to mP4, (though handbrake always gives me a file with an m4v extension), I set the constant quality RF, and I then I let it do its thing. Two movies so far though, will not play when they are done. It tells me its an unsupported format. In my case it has been Fargo and The Hurt Locker. Others play just fine after having had all of the same setting set. I have attempted to re-do the process in Handbrake but with no luck. Have you all run into this before as well?