rubygem-gstreamer from home:ykoba:ruby project
Select Your Operating System
Add repository and install manually
For openSUSE Leap 42.3 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:ykoba:ruby/openSUSE_Leap_42.3/home:ykoba:ruby.repo zypper refresh zypper install rubygem-gstreamer