Completely forget: I've tagged version 0.0.3 of μPlayer (a small video player using #gtk and #gstreamer targeting fullscreen landscape playback on mobile phones) the other day:
@twiclo mpv has way, way more features and I use it a lot on the desktop.
µPlayer doesn't even try to compete but rather to be mobile and touch friendly.
Playback speed was on the list of things to add so I added that (https://gitlab.gnome.org/guidog/livi/-/merge_requests/3, needs some styling) and I tripped on a phoc bug in fullscreen and fixed that as well.