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Hi Takashi,
It's a general problem with many digital receivers. When the stream stops, a digital receiver turn itself off until it re-receives a new stream. And this on/off takes a few seconds.
Thus, you must not stop the stream, but you'd need to keep sending the silent stream even if you stop a playback.
Thank you for your explanation.
I have made sure that the following process is always running when pulseaudio is:
play -n -c1 synth sin gain -100 > /dev/null 2>&1 &
This way, there is always a stream that never stops. The problem of the silent second after starting new audio is solved by that. (I have made sure that the correct output card is used.)
However, every few minutes, the stream still seems to be gone for half a second; even during active additional audio playback (as well as the above sox command), the audio output is silenced for a second and the icons on my receiver are gone meanwhile. Though, pulseaudio does have an output stream all the time without any pause. So there seems to be some other place where the outgoing DP MST stream is lost, delayed or interrupted causing this issue.
During the last few hours, the period of this disruption has been quite consistent between every 4 and 6 minutes.
Do you have any other ideas what might cause this or where parts of the stream could get lost?
Regards, Pascal