Data has been handled in the probe and will not be forwarded further.
For events and buffers this is the same behaviour as DROP (except that in
this case you need to unref the buffer or event yourself). For queries it will also return true to the caller. The probe can
also modify the FlowReturn value by using the GST_PAD_PROBE_INFO_FLOW_RETURN()
accessor. Note that the resulting query must contain valid entries. Since: 1.6