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Audio Not Working on AVP Transmitter

Basics

The following Just Add Power devices have analog mic- and line-input ports:

  • 418AVP - 2G+AVP Transmitter
  • 718AVP - 3G+AVP Transmitter
  • 749AVP - 3G+AVP Rackmount Transmitter

The analog audio input ports are able to embed an audio signal onto the HDMI signal, transmit that across the network to a Receiver, and have the Receiver play the audio signals. This leaves the possibility for 3 audio signals - HDMI, Mic-input, Line-input - to be combined.

No Analog Audio on TX and RX

The Mic-Input and Line-Input ports are not enabled by default. Enabling the ports must be done manually:

Function Command Description
Enable Mic-In dd_mic_on.sh Enables the Mic-In port
Disable Mic-In
(default)
dd_mic_mute.sh Disables the Mic-In port
Enable Line-In dd_line_on.sh Enables the Line-In port
Disable Line-In
(default)
dd_line_mute.sh Disables the Line-In port
Enable HDMI Audio
(default)
dd_main_on.sh Enables the audio signal coming from the HDMI source
Disable HDMI Audio dd_main_mute.sh Disables the audio signal coming from the HDMI source

Analog Audio on TX, No Analog Audio on RX

Once the Mic-Input and Line-Input ports are enabled, audio will play out of the Stereo port on the Transmitter. If the audio signal is not playing on Receiver - through either HDMI or the Stereo port - that means the HDMI signal does not have audio and the audio driver has been disabled on the Transmitter.

To enable the audio driver on the Transmitter all the time - regardless of if there is HDMI audio or not - send this command to the Transmitter:

astparam s v_rx_drv_option 6;astparam save;sleep 1;reboot

The Transmitter will reboot once the command is appliedWARNING: This setting will cause the Transmitter to always output a signal. Do NOTrun JADConfig with this setting applied on a Transmitter.

If using 2G devices - or 3G devices in 2G Mode - the audio driver on the Receiver also needs to be enabled. Send this command to the Receiver:

astparam s a_force_dual_output y;astparam save;sleep 1;reboot

The Receiver will reboot once the command is applied.

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  • 04-Nov-2019
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