If you're streaming audio from your PC to your phone and using your phone as a mic at the same time, please let us know if this this post is relevant to you.
Performances degrade when the app is in the background
Some phone manufacturers try to increase battery life as much as possible. But it's sometimes to the detriment of long-running apps such as AudioRelay.
To reduce latency, AudioRelay sends the audio data on your device's "fast path". But on some devices, this results in a quality loss. (Confirmed on Xiaomi phones)
To fix this, try the AudioTrack output in the Android app settings. Note that this could increase the audio latency.
Inside the Android app, go to settings
Audio output
Select AudioTrack
Uncheck low latency
Otherwise, check that Windows is emitting the sound to a format of at least 48kHz
Type sound settings in the Windows search bar
Device properties
Click on Additional properties at the bottom
Advanced
Change the default format
Why is the volume so low?
The audio's volume received by AudioRelay can sometimes be tied to the volume of your PC.
Try to increase the volume in Windows before muting your PC.
There's a lot of latency when listening through a Bluetooth device
Unfortunately, audio played over Bluetooth is inherently going to have latency. You can observe the delay of your headset by playing with a soundboard app, or using this one.
If you don't notice any latency when using YouTube, it's because videos apps can compensate for the lag by synchronizing both the image and the audio. You can still notice the audio delay by pausing and resuming a video.
How to reduce lags and packet loss?
If you don't need Bluetooth, deactivate it. It can cause interferences
Simply disabling and re-enabling the Wi-Fi can help
Your connection is OK, but the latency is still a bit high
As noted above, if you're listening through a Bluetooth device, the latency is expected
The mean latency in the app is around 0 ms, the latency graph is flat and there's 0% of packet loss, but you notice some latency.
Try this if the Buffer value is near or above 100 ms
Make sure that you've selected OpenSL ES in the Audio output settings
Make sure that you've selected the Low buffer setting in the Buffer amount settings.
If that's already the case, select the Custom setting [PREMIUM REQUIRED]
Set the Maximum buffer to something between 30 and 50 ms. 10 ms will probably too low to be sustainable.
The app can't connect to your computer
Here are a few things to test
Make sure both the devices are connected, and on the same network
Make sure you're not on a guest network
If using a VPN app, make sure its settings allow LAN traffic
Enable options such as "Allow LAN traffic"
Disable options such as "Make invisible on LAN"
If both the PC and the phone are on Wi-Fi, you could check if both of them are on the same frequency (2GHz vs 5GHz)
Modifying your Wi-Fi connection could help (absolutely try this if you have connection issues in other apps too)
On your phone, open your Wi-Fi settings
Find how to modify your saved Wi-Fi network (try a long-press on it)
Click advanced options
Change the IP settings from DHCP to Static
(After testing, you can revert back to DHCP to go back to normal)
Choose an IP address (e.g: 192.168.1.100)
Set the DNS value to 8.8.8.8
Save
Your router could be preventing devices from communicating between them. You could search for one of these terms in your router settings and deactivate the option if not needed:
AP (access point) isolation
Client Isolation
Guest Mode
Port isolation
If you're on Windows
If you unchecked the Add firewall rules during installation, reinstall the app and make sure this option is checked
You can confirm that both devices can communicate with each other by sending pings (Try this app)
If you can ping successfully, and you've checked the suggestions above
Check that the port 59100 isn't used by another application. To find out, run the command netstat -ano | findstr "59100"
If you have Hyper-V enabled, check if 59100 is reserved by the system. Read more here​
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How to listen to music or a call at the same time as AudioRelay?
By default, AudioRelay will stop streaming if another app requests to play audio. Respecting what's called Audio focus in Android.
You can disable this behavior
Inside the Android app, go to settings
Click on Exclusive audio
Select one of the Deactivated option
How to fix the error: Child process exited with code 1
AudioRelay's CPU usage should be quite low. However, it can increase if your playback device is outputting to more than 2 channels. If you only need stereo, try this:
Type sound settings in Windows search
Click on the Sound Control Panel (below or on the right)
Right-click on your playback device
Click on Properties
Click on Configure speakers
Select stereo
The app tries to constantly reconnect
Be sure to have the latest server and app versions
On Windows: Restart the server, it will show a message if an update is available