Gst.Message.prototype.set_qos_values
function set_qos_values(jitter:Number, proportion:Number, quality:Number):void {
    // Gjs wrapper for gst_message_set_qos_values()
}Set the QoS values that have been calculated/analysed from the QoS data
MT safe.
- jitter
- The difference of the running-time against the deadline. 
- proportion
- Long term prediction of the ideal rate relative to normal rate to get optimal quality. 
- quality
- An element dependent integer value that specifies the current quality level of the element. The default maximum quality is 1000000.