mltframework/mlt — pull request #15 by eddrog (2012-10-27 12:00:56+00:00)
Title: register jack ports before activating client

this is the order it should be done. Otherwise there is a problem if
other jack clients (e.g ardour) are already running and you want to start mlt jack (registering
ports fail)

I checked several clients they all are doing it in this order and it works just fine now.