Returns the sequence number of this rectangle.
Sequence numbers are monotonically increasing and unique for overlay compositions and rectangles (meaning there will never be a rectangle with the same sequence number as a composition).
Using the sequence number of a rectangle as an indicator for changed pixel-data of a rectangle is dangereous. Some API calls, like e.g. set_global_alpha, automatically update the per rectangle sequence number, which is misleading for renderers/ consumers, that handle global-alpha themselves. For them the pixel-data returned by gst_video_overlay_rectangle_get_pixels_*() won't be different for different global-alpha values. In this case a renderer could also use the GstBuffer pointers as a hint for changed pixel-data.
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the sequence number of this |