[Bug 796541] waylandsink: support video crop using viewporter protocol

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796541

--- Comment #9 from Haihua Hu <jared.hu at nxp.com> ---
(In reply to Nicolas Dufresne (ndufresne) from comment #8)
> Just looked, as caps a display width / height, we need to remember the
> allocation caps, or compute somehow the padded width/height, otherwise we'll
> get errors like this.

I got some other errors like below:
** (gst-launch-1.0:3428): CRITICAL **: gst_video_frame_copy: assertion
'dinfo->width == sinfo->width && dinfo->height == sinfo->height' failed

and something like below:
Unsupported strides and offsets.

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