Overview
AVP Encoders in both 2G and Ultra 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 Decoder, and played on the Decoder. 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/or line-input ports:
- 418AVP
- UL-717WP2
- UL-718AVP
- UL-749AVP
- UL-718WP4
- UL-718KVM + DSP KIT
- UL-749KVM + DSP KIT
Situation 1: No Analog Audio on Encoder and Decoder
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 Encoder, No Analog Audio on Decoder
Once the Mic-Input and Line-Input ports are enabled, audio will play out of the Stereo port on the Encoder. If the audio signal is not playing on Decoder - 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 Encoder.
To enable the audio driver on the Encoder all the time - regardless of if there is HDMI audio or not - send this command to the Encoder:
astparam s v_receiver_drv_option 6;astparam save;sleep 1;reboot
The Encoder will reboot once the command is applied. WARNING: This setting will cause the Encoder to always output a signal. Do NOT run JADConfig with this setting applied on a Encoder.
If using 2G devices - or Ultra devices in 2G Mode - the audio driver on the Decoder also needs to be enabled. Send this command to the Decoder:
astparam s a_force_dual_output y;astparam save;sleep 1;reboot
The Decoder will reboot once the command is applied.
