[Bug 792435] v4l2src selecting suboptimal colorspace

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=792435

--- Comment #4 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
Created attachment 366689
  --> https://bugzilla.gnome.org/attachment.cgi?id=366689&action=edit
v4l2src: Maintain downstream caps order

The g_list_insert_sorted() will behave like prepend when the compare
function returns 0. In our case, we want to maintain the order hence
append. This fixes this issue and improve the sorting algorithm to make
a 10x10 prefered over 10x200 with a preference of 10x8 (and similar
cases which was badly handled). This fixes generally fixes issue were a
sub-optimal format / size is picked.

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