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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
Directly setting rtspsrc to the NULL state before putting the pipeline in the NULL state usually works, but it can cause a deadlock in some cases, so it's not a reliable mechanism to fix this.
This reverts commit f37afdaf: "rtspsrc: Fix state changes from PAUSED to PLAYING"
and commit 76d624b2: "rtspsrc: Do not send PAUSE command when going to GST_STATE_NULL"