Compress movie for CD-ROM

I've been working on a video conversion project using the ADVC300 to import old VHS clips into iMovie 6.
For the past two weeks I've read and experimented every which way to get a good quality representation of my video on the computer. The only good looking file that didn't give me black horizontal lines everywhere (MPEG-4 and H.264 tests) was the full quality setting. After much frustration with this I set it on the "Compress movie for CD-ROM" setting as a last resort, only to find this was exactly what I wanted. From my comparisons these files look as good as the .dv files at a MUCH smaller size.
So, just out of curiosity, is there any way of finding out exactly what these CD-ROM settings are? How exactly is this stuff getting compressed?
Thanks for your input.

Great. I'll use those settings and experiment a little.
Now, if I could only find some way of speeding up the process. I know, buy a new computer. One 12 minute clip took about 50 minutes to finalize last evening. This will be a long process, with about 2 boxes of VHS tapes to convert, but at least there's other things to be done in the house while the computer is churning away.
Thanks!

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