[Bug 684237] videomixer: Caps negotiation does not always work

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=684237
  GStreamer | gst-plugins-good | git

--- Comment #57 from Nicolas Dufresne <nicolas.dufresne at collabora.co.uk> 2013-05-20 15:48:47 UTC ---
(In reply to comment #53)
> (From update of attachment 229286 [details])
> I don't think this patch is correct, video caps should always contain those
> fields... and additional fields will not cause accept-caps to fail.

Here's an example:

-> Branch A choose video/x-raw, but videomixer sets
video/x-raw,pixel-aspect-ratio=1/1
-> Branch B choose video/x-raw, which will fail accept caps, since video/x-raw
is not a bubset of video/x-raw,pixel...

Using gst_video_info_(from/to)_caps() is what introduce this issue.

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