Due to the alpha value being inserted with _BEFORE, we were ending up with ARGB instead of RGBA, thus displaying completely wrong colours. According to libpng's manual, "to add an opaque alpha channel, use filler=0xff or 0xffff and PNG_FILLER_AFTER which will generate RGBA pixels". Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4756>