[Bug 720345] videobalance: handle unsupported caps features in passthrough mode

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=720345
  GStreamer | gst-plugins-good | git

Nicolas Dufresne <nicolas.dufresne> changed:

           What    |Removed                     |Added
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                 CC|                            |nicolas.dufresne at collabora.
                   |                            |co.uk

--- Comment #7 from Nicolas Dufresne <nicolas.dufresne at collabora.co.uk> 2014-01-08 15:08:10 UTC ---
What would we do if a color balance parameter is set but the current
pass-through caps is unsupported ? Doing nothing would be persived as a buggy
behaviour and failing the pipeline would be unwanted.

Unless there is a way to reconfigure an upstream converter, but that might be
racy. I think supporting the new pixel format, or implement a slow but generic
path using pack/unpack is better. (same apply for videoscale I guess)

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