flatpak from home:ykoba:multimedia project
Select Your Operating System
Add repository and install manually
For openSUSE Leap 15.1 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:ykoba:multimedia/openSUSE_Leap_15.1/home:ykoba:multimedia.repo zypper refresh zypper install flatpak