In general I think the DV codec is useless for graphics, especially if you have text or any kind of thin lines.

I think it is a bit strange however, that with drives delivering 115 mb/s, playing uncompressed files doesn´t work well. It seems you have to have drives that deliver 10x the actual data rate of the files in order for them to play well.

I think I read somewhere that Catalyst supports alpha channels is you render to the Animation codec, is that right?