The gstreamer cache in ~/.cache/gstreamer-1.0 goes stale and must be
manually deleted after changing what gstreamer plugins are installed.
This can be dangerous as old plugins might be referenced long after they
have been upgraded, causing the user to continue using old plugins
despite an upgrade.
GPG: BCA6 89B6 3655 3801 C3C6 2150 197A 5888 235F ACAC