Hello, I have this pipeline playback bin playbin2 ! audioconvert ! audioresample ! ... ! audioconvert ! audioresample ! tee ! queue ! alsasink record bin queue ! audioconvert ! audioresample ! encoder ! filesink I Want to add dynamically a record bin so I can record to file while listening so what I does is 1. get the source pad the tee is connected 2. block that source pad 3. in the blocked callback 3.1 add the record element to the playbin 3.2 link the sink pad of the record element to a new created tee source pad 3.2 call to unlock the previously blocked pad This have been working for me very well for latest ubuntu releases but fails in ubuntu oneiric. The problem is that the blocked pad callback gets called twice. What can be wrong ? Thanks in advance Juan Rios