> 1) ffmpeg2theora parameters that shrink arbitrary video (including
> perhaps ogg) to a good size/quality for web video.

-x 640 -y 480 (or whatever values you wish).
You may want to have a loo at the -p option (predefined settings, one
of which may
be just what you need already).

> 2) good options for oggz-comment to add author, copyright, and license
> information.

oggz comment -o new.ogv original.ogv author="foo" copyright="bar" licence="baz"

Add -d if you want to remove what comments are already present.

Note that ffmpeg2theora can take those metadata as command line options too,
if that's easier.

There is also a Python UI for ffmpeg2theora. The metadata support for it
is commented out, however, but you can select video size/quality from it:
  cd frontend
  ./"Simple Theora Encoder.py"


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