Comment 7 for bug 1640606

Applies also to decibel. Probably its due to Mint 18 is not shipping the old gstreamer plugin (aka ugly) anymore.

Look here:
https://forums.linuxmint.com/viewtopic.php?t=227609

Relevant (but ugly) information to get it working again:

"The solution was to manually install the gstreamer0.10-plugins-ugly package (manually downloaded from the repos). I also had to manually download/install some of its dependencies."