[Bug 748344] bufferpool: in renegotation, bufferpool can be given to element while another one still uses it

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=748344

--- Comment #1 from Thiago Sousa Santos <thiagossantos at gmail.com> ---
Created attachment 302449
  --> https://bugzilla.gnome.org/attachment.cgi?id=302449&action=edit
test application

Took a little longer but here is a sample code to reproduce the failure. It is
very simple: videotestsrc ! videocrop ! videoscale ! capsfilter !
autovideosink,

set a pad probe for caps event after videocrop src pad and from that set the
same caps to capsfilter and also set some cropping in videocrop.

This way the same caps will first reach videoscale and it will go on
passthrough but on the next iteration videocrop will push a different caps and
videoscale will need to switch to non-passthrough.

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