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Arun Raghavan authored
This makes sure we do not touch the stream taglist once the pipeline has been prerolled. Adding of stream tags happens in the pad event probe which runs in a different thread from discoverer stream processing, so modifying the tag list while discoverer might be processing it can sometimes cause a crash. https://bugzilla.gnome.org/show_bug.cgi?id=639778
6ac2e5d3