Commits 12505, 12508, 12509, 12510

12505:
Thanks, Petri. Looks much better now.
And it raises that register_enum () question again.
What do you think?

12508, 12510:
People might still use older ffmpeg versions.
See my latest fixes.

12509:
What exactly is this good for (remember the main lists
are already fixed, and these additional syms are not
used elsewhere)?

Torsten

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