Broadcast audio stream from NX server

Answered

Gordon Remmington

October 19, 2021 14:43

Can NX transmit a broadcast audio stream from the server?  I'd like to be able to do this from a rule - i.e. play a sound but transmit as an audio broadcast network stream for some devices to receive.

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  Norman

  • Network Optix team

  October 25, 2021 09:07

  Hi Gordon Remmington,

  Can you elaborate a bit more what you mean?

  Currently, we have the following option;

  Any event, can trigger the Play Sound/Repeat Sound action, which enables you to play an sound from the list or a custom clip of up to 15 seconds.

  In the upcoming release there will be a feature that enables you to do audio/video mapping, so you can add the audio input of Device A to the stream of Device B, etc.

  If you only want to extract the audio stream from the existing audio/video stream, you might be able to do this with an application called FFmpeg.

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  Gordon Remmington

  October 25, 2021 15:17

  Thanks Norman

  Perhaps multicast paging is the correct term.  A number of network devices such as IP phones (e.g. Snom phones, Snom PA1, Grandstream), Algo or 2n paging devices can transmit and/or receive broadcast audio.  

  I'd really like to be able to do this natively from within the NX server, to send a multicast audio message or alert, which can be received on IP phone handsets or speakers, particularly for emergency notifications.

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  Norman

  • Network Optix team

  October 26, 2021 10:00

  Hi Gordon Remmington,

  The devices you refer to are SIP devices and these aren't compatible with Nx Witness, so you cannot play an audio clip from Nx to the devices. 

  But, I notice that the SNOM PA1 for example is a network connected device and has I/O's.
  So, most likely there are two options, assuming the desired audio messages are loaded onto the SNOM PA1 or similar devices and Nx Witness need to trigger these devices to play the desired audio message.

  If this is the case, the following might be possible: 

  1. Any Event >>> Do HTTP request action, and the URL consists of the API call to activate the audio message on the device.
  2. Any Event >>> Camera Output, and wire the camera or I/O unit output to the input of the device to activate the audio message on the device.

  If there are no speakers yet in the project, you could use the audio devices of Axis.

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  Gordon Remmington

  October 29, 2021 12:34

  Thanks Norman

  Understood, the NX can't transmit broadcast audio.  I'll investigate the capabilities of the other devices and see if we can activate with an http request.

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