I've been converting my DVD collection for ATV use. I've been using RipIt and Handbrake. I'm ripping/encoding separately primarily cause I'm using the disc drive on my older 2007 MBP and encoding on my new retina MPB with no drive. It's also better for batch encodes. Most of the time this works fine but I have several discs that seem to rip fine and are even playable in DVD player but when I load them into handbrake I get the "No valid source found" error. I can rip/encode directly in handbrake from my older MBP but that means the difference of a 2 hour encode vs 20 minutes on my new MBP. I also tried using handbrake on my new MPB and connecting via remote disc but get the "No valid source found" error that way too. Any suggestions? Thanks.