[Bug 768248] vaapiencode: Add Encoding region-of-interest (ROI) support

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=768248

--- Comment #85 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
(In reply to Víctor Manuel Jáquez Leal from comment #78)
> (In reply to Nicolas Dufresne (stormer) from comment #77)
> > I think that the ROI seems to get lost along the way in:
> > 
> > gst-launch-1.0 -e v4l2src ! videoconvert ! facedetect
> > profile=haarcascade_frontalface_default.xml ! videoconvert ! queue !
> > vaapipostproc ! vaapih264enc default-roi-delta-qp=10 rate-control=cbr
> > bitrate=512 ! ...
> > 
> > like if "plugins: copy input buffer metas" had no effect.
> 
> Did you check with vadumpcaps if your driver/backend supports roi with h264??
> 
> In my kabylake it doesn't, but it does for h265

No, but I can confirm that vaapipostproc does not copy the meta, fixing it.
I've just validating the ROI makes it to the encoder. The code seems to think
that this is supported.

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