Uncompressed avi is the best you can ask for, gives you control to do whatever you want. Either way unless people are forcing the avi to upscale the hell out of the recording with the mame option, I think you have to take it into another editor before uploading to youtube if you want it to be accurate. This is because the mame recordings are at the original rate (around 60 fps) and youtube only supports 60 fps for 720 and higher as far as I know and the way they chop it down is just by deleting every other frame in their encoding. That's why all the mame recordings of Dangun Feveron have the pickup disco men blinking on and off instead of translucent. Most mame videos on youtube that aren't 720 or higher and 60fps are basically a disaster. That's my view/current understanding of the situation anyway. The way to get the videos to look correct at lower resolutions and youtube's 30 fps for 480p and lower would be to use an editor to correctly blend the frames into a 30 fps output to upload instead of allowing youtube's encoder to delete every other frame.