Showtime, the video player I'm developing for #GNOME has entered Incubator and is available on the GNOME Nightly repo for testing 

I'm hoping for it to replace Totem (Videos) in GNOME 48 and I will publish it on Flathub soon.

Setting up GNOME Nightly: https://nightly.gnome.org/

The repository for the app: https://gitlab.gnome.org/GNOME/Incubator/showtime