How to stop playing DVB Broadcast

how can I stop a DVB-C/T/S channel that has been tuned (DirectTune) and started in tvwindow. A simple hide is unfortunately not enough as the sound can still be heard in the background and the video is always running. There is no stop and close like in avplay. Even a setBroadcast({}) has not worked so far. How can I stop the playing channel again?
I have built a workaround. I tune a hopefully non-existent frequency. But that takes time and is not very safe.
Is there a stop function like in IP stream playback (this.avPlay.stop();this.avPlay.close())?
And is there a functional difference between Tizen 4.0 and 6.0?
Thank you.