[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 #23 from Thibault Saunier <tsaunier at gnome.org> ---
(In reply to Sebastian Dröge (slomo) from comment #22)
> Maybe as a way forward:
> 1) Remove crossfade code from compositor, implement a SRC and ADD mode (we
> have the code for that already). That allows doing crossfading like now if
> all inputs are fully opaque. This can then be moved to -base with
> videoaggregator and everything.

Adding modes is not mandatory imo, but well, if you want :-)

> 2) Copy the old compositor to a new crossfadecompositor (better name
> please). That can then be used by pitivi for the time being until we
> implement a nicer and better crossfade/transition element. Which IMHO should
> also have additional constraints (like no positioning, only same input
> sizes, only two pads, ...).

Well, let's just have call it videotransition and have it have 2 pads, and let
it grow in the future.

I do not think we want this kind of restriction at all, the end user can
transition whatever he want, no reason to not let it do that!

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