[Bug 754465] compositor: Negotiation failure with ARGB64

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=754465

Thiago Sousa Santos <thiagossantos at gmail.com> changed:

           What    |Removed                     |Added
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 Attachment #311026|0                           |1
        is obsolete|                            |

--- Comment #9 from Thiago Sousa Santos <thiagossantos at gmail.com> ---
Created attachment 311174
  --> https://bugzilla.gnome.org/attachment.cgi?id=311174&action=edit
videoaggregator: fix caps query to properly handle alpha formats

Only accept alpha if downstream has alpha as well. It could
theoretically accept alpha unconditionally if blending is
properly implemented for handle it but at the moment this
is a missing feature.

Improves the caps query by also comparing with the template
caps to filter by what the subclass supports.

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