[Bug 758548] vaapipostproc: Allow video scaling using capsfilter

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=758548

--- Comment #11 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
Created attachment 327377
  --> https://bugzilla.gnome.org/attachment.cgi?id=327377&action=edit
vaapipostproc: don't use GstVideoInfo for src caps

Instead of using gst_video_info_to_caps () to generated the fixed src caps,
this patch enables the first step for caps negotiation with a possible
following caps filter.

_get_preferred_caps() will traverse the possible src caps looking for the one
wit the preferred feature and the preferred color format. Then the color
format, the frame size and the frame rate are fixated.

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