Encoding DVD -> MP4 Just Stops (Says It's Finished)

I have Nero Recode (Part of the package I bought) - when I install an old DVD that I made quite a number of years ago, it sees and plays the DVD just fine.

When I go to encode it to MP4 - Nero takes about 3 seconds and states it's finished with NOTHING in the output file. (0 bytes) No, it's NOT a protected DVD, it's an old home video I converted/copied to DVD.

Any suggestions?
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