I use iMovie-HD to edit my High Definition home movies I capture from my Canon 1080i NTSC camcorder. Editing goes perfectly but when I come to the point to export my project to some High-Definition video format the result is disappointing. If I choose to export in full quality .mov format, the final video file is HUGE; something like 30GB for 30min of video, and my core2duo processor drops frames during playback. If I choose Apple TV format (.m4v), then the file is relatively small with no dropping frames during playback, but resolution is too low less than 720p and overall image quality too bad. When I choose other formats like DivX, then even with 1080p quality the pixels are too big due to compression method and final image quality still bad. Ive also tried .mp4 format in 1080p but in this case there is some misynchronization with the frames apparently due to de-interlace from 1080i to 1080p, and also I notice problems with the synchronization between image and sound. Furthermore, the file has a quiet high bit rate by default, something like 7.000kbps, which causes frame dropping again. Please can somebody help me on this? What format is the best to create 1080p HD movies from 1080i source for playing back from my Mac, and with what program should I export my video project? Perhaps I need to make changes to the iMovie export settings.