[Bug 704950] videomixer: add colorspace conversion

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=704950
  GStreamer | gst-plugins-good | git

--- Comment #20 from Mathieu Duponchelle <mathieu.duponchelle at epitech.eu> 2013-07-29 09:54:48 UTC ---
(In reply to comment #17)
> (From update of attachment 250230 [details])
> Looks good in general, but this *only* ever does conversion if we run into one
> of these race conditions, right? E.g. If one pad is configured with RGBA
> already, but another one tries to configure with I420 and checked what
> videomixer can do before RGBA was configured?
> 
> Would it make sense to just always allow conversion now inside videomixer but
> keep the configured format at the top of the caps that are returned by the CAPS
> query?

I'm not sure I understand this comment, the conversion will not only take place
in the race condition scenario, but as well when a first pad is configured with
a format, buffers flow for a moment then after eg 1 second a new pad is added
with a different format there will be conversion, and possibly renegotiation of
the output format.

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