This is a strange one... I store my mostly Handbrake-ripped video files on a 500GB Time Capsule, using my Powerbook to run iTunes and stream wirelessly to my ATV. The setup worked like a charm until recently, when I noticed I couldn't stream movies anymore. I get the dreaded "Selected video could not be played, format not recognized" error. I can play movies from the Time Capsule on my Powerbook just fine, and can browse files wirelessly with no problem--so it doesn't appear to be a connectivity issue. Synced movies also play just fine, so the format is good. What's frustrating is that I'm not exactly sure when this started happening. It could have been after the ATV 2.1 update or after I installed iTunes 8. Anybody else experienced this issue? I'm at a loss.