Blends the overlay rectangles in comp on top of the raw video data
contained in video_buf. The data in video_buf must be writable and
mapped appropriately.
Since video_buf data is read and will be modified, it ought be
mapped with flag GST_MAP_READWRITE.
Blends the overlay rectangles in comp on top of the raw video data contained in video_buf. The data in video_buf must be writable and mapped appropriately.
Since video_buf data is read and will be modified, it ought be mapped with flag GST_MAP_READWRITE.