Package: lollypop Version: 1.2.19-1 I see that gstreamer1.0-libav is set as a hard dependency of lollypop in Debian. However, upstream does not list gstreamer1.0-libav as a dependency [1]. If lollypop runs without gstreamer1.0-libav, then it should not be a run-time dependency. If the idea is to support more music formats in lollypop, then gstreamer1.0-libav should be a suggested package (or a recommended package if it provides very popular music formats).
[1] https://gitlab.gnome.org/World/lollypop#depends-on
