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Add a generic V4L2 boolean control V4L2_CID_MPEG_VIDEO_BACKGROUND_DETECTION that allows encoders to detect background regions in a frame and use fewer bits or skip mode to encode them, potentially reducing bitrate for streams with stationary scenes. Signed-off-by: Jackson Lee <jackson.lee@chipsnmedia.com> Signed-off-by: Nas Chung <nas.chung@chipsnmedia.com> Reviewed-by: Nicolas Dufresne <nicolas.dufresne@collabora.com> Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com> Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>