[Bug 751647] audio/video: Copy over more metas by default

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=751647

--- Comment #3 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
As discussed on IRC, elements should do the following:

- If all tags of a meta are known, and known to not be affected by whatever the
element does, then the COPY transform should be called
- Otherwise one or more non-COPY transform that correspond to whatever the
element does should be called on the meta


We will need to add more meta transforms, and probably also more tags.


Also videocrop/roi are currently having wrong tags or incomplete tags at least:
video, video-size. However the size can stay the same but still the meta can
become invalid, e.g. when keeping the size but cropping+scaling the content.

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