This way it is clear that you are using a variable reading the scenario
and we can verify that what the scenario writer intents is to use an
already set variable.
In case of fast-forward scenario, the playback-time is not set properly
as per increase in the rate. This is resulting in short media files of duration
less that 15 seconds to fail.
https://bugzilla.gnome.org/show_bug.cgi?id=754151