David,
You need to do the math. First, don't output an animation file directly from Artlantis or any other program for that matter. Output individual tiff frames, sequentially numbered, to a folder of their own. - Most quality programs do this nicely.
Then load them into Quicktime Pro, all you need to do is import the first frame of the sequence. Now once you have them in QT, you can set the output options, frames per second, output size, which compressor to use, etc. - Bingo!
If you don't like the results, want to lower the FPS, increase the resolution, whatever, do it again. Double Bingo! You see, you don't need to re-render the entire project over again, just reprocess.
Save the individual frame sequences to CD - or DVD. Keep them around and next month you might come up with another use for them. I render at Digital Video format 720x486 D1 NTSC then down sample from there. This way one rendered sequence can go all the way from Video/DVD to web format. Especially looking forward to H.264 videocodec via Apple Computer QTpro. I will probably then switch to HD format 1920 x 1080 HDVS, which can go from HD to cell phones.
Just think, first half of 2005 Apple releasing computers with the ability to burn HD disc's and consumer units able to play the new standard, H.264.
See:
http://stream.apple.akadns.net/