[gstreamer-bugs] [Bug 617512] [alpha] should work in passthrough in all formats if alpha == 1.0

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=617512
  GStreamer | gst-plugins-good | git

Sebastian Dröge <slomo> changed:

           What    |Removed                     |Added
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                 CC|                            |slomo at circular-chaos.org

--- Comment #3 from Sebastian Dröge <slomo at circular-chaos.org> 2010-05-04 07:53:21 UTC ---
(In reply to comment #2)

> > So in short I think it's a bad idea to make the negotiated caps depend on a
> > controllable (i.e. settable while the pipeline runs) property.
> 
>  You do realize you don't need a GstController to change that property ?
> Changing caps at runtime isn't a problem with other elements (videoscale does
> that fine), why should it be a problem now ?

...only that videoscale changes the caps only if a downstream or upstream
element provides new caps. But videobox does what you said and nobody ever
complained :)

I think it's a good idea to support this in the alpha element too, but maybe
make it an extra property. The element's documentation says that the element
will add an alpha channel, which it definitely wouldn't with your proposed
change.

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