Ola Shilvin! Worked perfectly! the "test.mov" created is a ProRes 422 HQ, is it possible to create in the ProRes 4444 codec option? ProRes 4444 support 12 bits per channel or more and Alpha channel "Transparency" channel for Masks. Thanks a lot for your help! Tom -- Sent from: http://gstreamer-devel.966125.n4.nabble.com/