since it sounds like you may have multiple destinations, the best choice would be to render to an uncompressed or lossless codec from ae, then take that file into a compression utility to compress for any of the other destinations…
there are several uncompressed codecs to choose from… uncompressed avi, quicktime ‘none’, image sequences like tiff or tga. for lossless compression quicktime ‘lossless’ and image sequences like png and psd. there are other choices that may work well based on your other software and hardware.
after that, you can compress to suit your needs for a given destination… i believe you tube uses flv, so you can take the uncompressed/lossless file and compress it to meet the you tube specs (check with you tube for compression settings). if you also wanted it to go to a dvd, you could also compress the file to mpeg-2 dvd standards.
to do most compression you will want a separate compression utility to get the best results. many streaming and high quality compression codecs use what’s called temporal or interframe compression. this kind of compression compresses data from multiple frames to create an extra layer of compression. ae cannot render that type of compression very well (it is rendering each frame and will have a hard time trying to compare data from one frame to the next to also generate compression). so a utility like sorenson squeeze or apple’s compressor will do a much better job.
does this help you at all?
Kevin Camp
Senior Designer
KCPQ, KMYQ & KRCW