Tivo to iMovie

I can't believe how difficult this is. I just want to take video off my tivo, clip out a 5-minute segment, and save it to a file that QuickTime (or any viewer that works on Mac and Windows) can view.

I use the official Tivo "Tivo Transfer" app for the Mac to get the file.
I use "tivodecode" to decode the file. The output is "MPEG sequence, v2, program multiplex".
I run it through mencode and get a file that is "ISO Media, MPEG v4 system, version 1".
Sadly, iMovie can only read version 2 format ("ISO Media, MPEG v4 system, version 2").

Does anyone have an easy way to either generate a version 2 file, or do the clipping on one of the earlier formats?

Thanks,
Tom

P.S. I am on a Mac.

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