Reusing a (preview) GESPipeline with new clips is not possible
Submitted by Sebastian Dröge
Created attachment 330481
See attached testcase (fill in the 2 URIs at the top). When clicking on the "next" button, it will set the pipeline to NULL state, removes clip, add new clip, commit timeline. Clicking on the "play" button has no effect but also there are no errors anywhere.
Attachment 330481, "ges-testcase.c":