v4l2src + compositor: trouble negotiating caps when doing PLAYING->READY->PLAYING

[mariannasb]

> I can see it failing around 50% of the times, so I guess it could be some
kind of race condition? 
> "v4l2src ! tee name=t1 ! queue ! videoconvert ! compositor name=mux !
> videoconvert ! fakesink t1. ! queue ! videoconvert ! gtksink name=sink t1.
> ! queue ! videoconvert ! mux." 
A small amendment to my previous post: the above pipeline fails all the time
with the non-negotiated (-4) error.
However depending on the length of the pipeline I can make it work
sometimes, as previously stated.
Still makes me think it must be some kind of timing issue.

Moreover I have tried setting videotestsrc is-live=true to see if the issue
was with compositor + a live source, but it runs fine.
So the problem must be some kind of incompatibility between v4l2src and
VideoAggregator.



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