[brink]

Does anyone know of a way to extract mpeg1 video/audio tracks from a .mov file and save them as a proper .mpg?

[Jacke]

Are you sure it's MPEG video in a Quicktime file? 'Cause that's pretty unusual...

If it is, is it muxed MPEG data? Get info in Quicktime, does it say "MPEG1 Muxed", or separate for each track "MPEG1 Video" and "MPEG1 Audio"?

If the data is muxed you should just be able to delete the Quicktime header, open the file in HexEdit and do a search for 'mdat', you'll get two hits, delete everything up to and including the second.
If it it's separate MPEG tracks in the Quicktime file, you'll have to extract each (using QT Pro or the old Movieplayer 2.5 in Classic), save as self-contained Quicktime file, delete the header, and then mux them together (there are a couple of tools that can mux MPEG files, I think ffmpegX can do it, and also MPEG2 Works). I'm not 100% sure that this method works, but it should.

[Jacke]

Testing, please ignore...

[brink]

That's exactly what I needed to know. Thanks!

The file started out as an mpg that QuickTime didn't like, so I demuxed it, saved the video/audio in a QT movie, and tossed the original file. I needed an mpeg file again, and I knew the mpeg streams had to be in there somewhere.