gstreamer-plugins-bad from SUSE:SLE-15-SP2:Update project

需要 pool ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/SUSE:SLE-15-SP2:Update/pool/SUSE:SLE-15-SP2:Update.repo
zypper refresh
zypper install gstreamer-plugins-bad