Shotcut on Debian Stretch

As gstreamer-0.10 is missing in Debian Stretch, you will need to download and install the two missing packages from Debian Jessie manually:

After that Shotcut will start without errors.

This problem also affects Ubuntu 16.10. We are going to have to build Qt 5.6 with the WebKit module for all OSes and without gstreamer on Linux. The gstreamer dependency is a superficial dependency of the Qt 5.5 binary libs we have been using on Linux.