Metadata files... if your movie is named filename.mpg, then the corresponding metadata file will be filename.mpg.txt. It's just a text file; you can make it with TextEdit. (Save as Plain Text, not Rich Text.) That line is the only line you need.
I wouldn't bother with reencoding it yourself; pyTivo knows how to do that. But h.264 is usable, if you use the "push" method to send it, from pyTivo's web interface. The other formats would just be reencoded by pyTivo anyway.
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