Previous version passed just enough data to the parser to detect
main/main-10, but main-422-10 is one of the range extensions profiles.
Those need a few more bits to be accurately detected, and since those
were just uinitialized memory previously, we'd incorrectly end up with
main or main-10 when the encoder was in fact giving us 4:2:2 10bit
output.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/9348>
c43d3900bf