fn drop(&mut self) {
        self.playbin
            .set_state(gst::State::Null)
            .expect("Unable to set the pipeline to the `Null` state");
    }
/// Cleans up GStreamer pipeline when `Backend` is dropped.
Cleans up GStreamer pipeline when `Backend` is dropped.
Cleans up GStreamer pipeline when ` Backend ` is dropped .
fn drop(&mut self) {
        self.playbin
            .set_state(gst::State::Null)
            .expect("Unable to set the pipeline to the `Null` state");
    }
fn drop ( & mut self ) { self . playbin . set_state ( gst :: State :: Null ) . expect ( " " ) ; }
Cleans up GStreamer pipeline when `Backend` is dropped.
Cleans up GStreamer pipeline when ` Backend ` is dropped .
&mut self