Hey, This is my first post so I hope I'm doing everything right. There are already some clues on this question in other topics, but there is not a real topic about this. I have a Canon hf200 and the video's that come of standard are mts files. 1080i 25fps, or 50i. With Imovie09 I make .Mov files out of them. Now if I try to edit those files in premiere or After effects. The playback becomes very laggy. I have Mpeg streamclip pro, But what is the best format to convert my .mov's to to keep as much quality as possible but make it easy to edit my videos. Eventually I want my vids to Play on youtube on HD with 1080 if possible. Thanks allot guys.