[Bug 758699] Assume unknown OMX color formats are similar to YUV420

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=758699

--- Comment #1 from Mathias Hasselmann (IRC: tbf) <mathias.hasselmann at gmx.de> ---
Created attachment 316306
  --> https://bugzilla.gnome.org/attachment.cgi?id=316306&action=edit
Proposed patch

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