compositor: image is visible under other non-transparent image
Here is a simple reproducible example:
gst-launch-1.0 \ videotestsrc ! compositor name=comp ! videoconvert ! autovideosink \ videotestsrc pattern=solid-color foreground-color=4279769112 ! video/x-raw, format=RGBA ! comp.
Expected behavior is that first non-transparent videotestsrc will be covered completely with solid grey color, but it is very easy to see that there is still a significant pattern behind grey color.
I think this is a significant bug in the way compositor works. Removing RGBA format fixes it.
Reproducible both on 1.16.2 and 1.17.2 (GIT)