Comment 5 for bug 943799

@kroq-gar78 - That example you link to is a GTK3 GObject Introspection based bit of code. OpenShot is still GTK2 based, all of the code needs converting (as the error suggests) to be able to use GObject instrospection.

There is an incomplete GTK3 branch (the timeline doesn't work), but we hope to complete the GTK3 migration for the next major release of OpenShot.