Hey, I shot some green screen shots with my canon t3i. I moved the clips into After Effects, removed the green screen, placed a nice background, everything perfect. However, the guy in the video is talking about stuff that's supposed to be added in After Effects. The playback is horrible though. It plays fine for a few seconds (the stuff which is already in the RAM) and then starts to play choppy. I deactivated all layers and effects (so I only got the original footage) and it still won't play nice. I opened up a new project, placed the files in there and I tried to play one of the videos. Still, the playback was choppy. Nothing was done with the footage (as I said, it was a new project). The sound is also missing (which is quite important to know when to add the elements). I guess it's because I don't know AE well enough. Apparently there is sound when you hit the zero button on your numpad. I'm editing on a 2008 iMac 2.8 ghz, the footage is on 1000GB FW800 drive. OS Lion. I'm puzzled, because premiere pro has no problems playing back the files. So what am I missing? Settings? Or should I convert the files to something less compressed? If so, what codec? I tried looking up a good codec. I know for final cut ProRes is a good one, but which codec works well with Adobe, while my mac is able to keep up?