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Digi IO stops playing when there is no input signal

zaiyers

November 20, 2019 21:23

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Hi everyone,

I have a Digi IO connected to a Raspberry PI 3B+. It's running raspian buster.
Sound is playing through pulseaudio and then broadcasted to other raspi's in the network as part of a custom multiroom installation. This part works fine for now.

However I'd like to broadcast audio from my tv as well. Therefore I need to connect the tv to the Digi IO and switch the cards pulseaudio profile from output:iec958-stereo to output:iec958-stereo+input:iec958-stereo.

As soon as I switch the profile the playback stops when the tv is turned off and no input is provided. Playback resumes - sometimes with huge delay - when I turn the tv on. Stops again when I turn it back off. Playback also resumes immediately when switching back to the output:iec958-stereo profile.

My current kernel version is 5.3.11-v7+. The same problems occurred with the latest stable (4.19.84-v7+) and all previous kernels that I've tried as well.

I'm not sure on how to continue with this issue and could not find any similar issues when search the forums. Any help is much appreciated. Thanks!

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3 comments

• 1
  
  HiFiBerry team November 20, 2019 21:41

  This is perfectly normal. If you try to read samples from the input and there are no input data, it will block. 
  
  Best regards,
  Daniel

• 0
  
  zaiyers November 25, 2019 18:51

  Hi Daniel,

  thank you for the quick reply. I didn't know that and just stumbled upon the faq which describe this behavior as well.
  I guess I'll try using a dedicated hifiberry for picking up the TVs signal and then stream that to the other devices instead.
  That way it won't matter if it blocks when the TV is turned off.

  Thanks!

• 0
  
  HiFiBerry team November 25, 2019 19:01

  For this use case, the DAC+ DSP might be the better option as you can directly route the TOSLink input to the output without even having to use Pulseaudio. With the right DSP profile, you can even automatically switch between TOSLink and Pi audio - depending on the signal on TOSLink.

  Best regards,
  Daniel