I use iMovie & QuickTime for video export, I have upgraded it from version 7 / 7.55 to 8 / 7.6. I use exactly the same setup for video export as before (Motion JPEG A) but I always get some tiny lines which destroys the quality of the video, you can see details here:
There is export from the new version on the left and export from the old version on the right. I think there must be something wrong with the compression but I have checked all the settings many times and I can find anything different compare it to my previous settings. Dont you know what can cause the problem please??