How to change property of an element in a pipeline?

[Ralph]

I don't know if it is going to help in your case, but when I had a problem
with the videosink becoming dead after changing properties of a pipeline,
Stefan Sauer suggested doing this:

> you could do a set_locked_state(TRUE) on the videosink (to avoid it
> going down), then goto READY, change uri, go back to PAUSED,
> set_locked_state(FALSE), go to PLAYING 

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