Gst.Message.new_async_done

function new_async_done(src:Gst.Object, running_time:Gst.ClockTime):Gst.Message {
    // Gjs wrapper for gst_message_new_async_done()
}

The message is posted when elements completed an ASYNC state change. running_time contains the time of the desired running_time when this elements goes to PLAYING. A value of #GST_CLOCK_TIME_NONE for running_time means that the element has no clock interaction and thus doesn't care about the running_time of the pipeline.