I've got the first gen Apple TV and I have many mkv videos that play fine on my Mac with Perian. However, I want to organise my videos in iTunes and also have them pkay on my ATV without the Perian plugin. I downloaded Subler and MP4Tools and I've tried converting several mkvs and although they work in iTunes, they don't on ATV. On my ATV the movie loads and I can hear sound, but the video is stuck on the first frame and after a while the ATV crashes. Any ideas?