Gregory's Server
Thanks to @slomo the #gstreamer gtk4-paintable-sink just got support for video rotations. This is nice for video apps, making playback of video recorded on phones (portrait mode) more easy or faster (avoiding a copy compared to using a dedicated gst videoflip element).
The change is even better for Snapshot, the #gnome camera app: it uses the sink for its viewfinder and avoiding additional copies here has quite an impact on #mobilelinux devices.
https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1590
In the future #gtk4 will hopefully be able to offload the rotation further to #wayland compositors, possibly allowing a zero-copy pipeline from the camera to the display. That needs more work though.