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Audio Not Working on AVP Transmitter


Overview

AVP Transmitters in both 2G and 3G systems have up to 3 audio inputs: HDMI, Line-In, Mic-In. The analog audio input ports can be embedded onto the HDMI signal, transmitted across the network to a Receiver, and played on the Receiver. This leaves the possibility for the 3 audio signals to be combined if all 3 signals are active and enabled. These audio inputs can be independently turned on and off, and their default status is different depending on the version of firmware. Use this article to enable or disable the audio inputs so that audio is working the way it is needed.


Compatible Models

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

Situation 1: 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

Situation 2: 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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  • 21-Dec-2022
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