[Bug 797169] compositor: Remove crossfade property and implement a more extensible interface like in glvideomixer

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=797169

--- Comment #13 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
Thibault, so how do we go ahead with this? I still don't understand what
exactly you need in pitivi and the phabricator link to the original ticket is
404 now.

Especially it's not clear to me what exact blending behaviour you need (both
with only two pads, but also with >2 and what should happen with the
background), and why maybe the "weird" behaviours (see what I wrote above but
also Matthew) in the current crossfade mode are actually required.

Once I understood that, I can come up with an API proposal for both compositor
and a possible crossfadecompositor (or maybe a non-compositor-based crossfade
element with just two pads that can also be extended later for other fades, see
shapewipe and the smpte transitions for example).

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