Thank you for your answer. I just miss something, that's not clear in the doc, what are the correct parameters of this callback https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-plugins/html/gst-plugins-base-plugins-glimagesinkelement.html#GstGLImageSink-client-draw ? -- Sent from: http://gstreamer-devel.966125.n4.nabble.com/