[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 #27 from Mathieu Duponchelle <mduponchelle1 at gmail.com> ---
(In reply to Sebastian Dröge (slomo) from comment #25)
> Not having such restrictions means more complicated internals and it
> restricts how you can change the internals / extend the internals :) But
> that's for somewhere else to discuss I guess.

But having such restrictions means the described element would be useless in
pitivi's context, currently compositor provides a usable solution to a real use
case and we should strive to preserve it.

Considering that new mixing stack was initially implemented to serve pitivi's
use case better, it feels a bit awkward to now decide that its use case is not
in scope for the version that eventually gets promoted :)

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