[Bug 724131] colorbalance: add colorbalance meta API

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=724131
  GStreamer | gst-plugins-base | git

--- Comment #20 from Nicolas Dufresne <nicolas.dufresne at collabora.co.uk> 2014-05-26 17:28:01 UTC ---
The fact is that playbin already do (at least tries to do) the right thing for
this use case. This bug wasn't filed with an actual issue, just a let's do
this. I would close/invalid this one.

Transformation metas would be nice at some point, but they will need to be a
single meta that stack the transformation to maintain order. The problem that
would remains is that if you have:

trans1 ! trans2 ! trans3 ! sink

And sink does not support trans3, then trans1 and trans2 need to do the job in
SW and not passthrough.

Now, it's a nice feature to be able to stack transformations, but at the same
time, we have the opengl elements that can do that already, so I don't feel
it's essential. For cogl/clutter, I think the way forward is to keep pushing
for interoperability, and then we can focus on enhancing playsink toward fully
GL if possible, otherwise standard SW elements we've been using so far. Remains
to find how, but to be honest I'd keep it simple.

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