hi i keyed out some footage and precomped it, brought into a new comp with a background "room" in it but i'm getting this weird problem with the footage looking like garbage, i'm still working on the video but what can this problem be? it almost looks like an interlacing issue or something, but it's these lines across the whole footage. all layers are 3d, and i have an ambient light layer in case that has anything to do with it. you can see it a lot in his arm near the end.
Not really much to see in that YouTube video that could be interpreted as encoding artifacts. Can you post a still frame? What you describe could possibly be pixel aspect ratio issues which sometimes occur when mixing different ones of them on 3D layers. You should also check your key. It's possible that your Alpha is not 100% transparent and causes some unnecessary extra blending operations that screw your stuff.
i think you might be right with the pixel aspect ration part....i know this is a silly question but how can i create a still frame in AE so i can show you better? the youtube video looked so crappy that you couldn't tell the specific problem. how can i fix the pixel aspect ratio problem if it is that?