This function gets back user data pointers stored via gst.mini_object.MiniObject.setQdata and removes the data from object without invoking its destroy() function (if any was set).
A #GQuark, naming the user data pointer
The user data pointer set, or null
This function gets back user data pointers stored via gst.mini_object.MiniObject.setQdata and removes the data from object without invoking its destroy() function (if any was set).