I just bought an AVCHD camera that compresses to a m2ts file extension. Everytime I try and edit the AVCHD footage, this happens.
Everything works except for the playback. When I playback the footage in the timeline it has artifacts in the image, color streaks, and blockiness. Only when I playback, there is nothing wrong with the footage! I've tested it elsewhere. It only does it during playback on the time line, no other time
All other files work fine, also I still have CS3 installed on my computer, I don't know if that could cause this problem. I am on an xp computer.
With the limited details provided it is hard to tell, but something tells me it might be be a limitation of your hardware.
Try setting your Playback Mode from Automatic to High.