7D .mo .264 to Avi convertor for Mac
Not sure about AVI, but I use the free mgeg streamclip to convert video to apple intermediate and then do my editing in FCE using apple intermediate. When done I find mpeg streamclip gives me better results in converting back to H.264 for upload, too.
You'll fine it at http://www.squared5.com/
|_F0A5334-Edit_small by Dester Wallaboo|
from Open Air Fashion Photography
|Feed me, me, me, me, me by Denjw|
from Attention-Seekers in Nature