The Tool Desk
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Start by identifying which audio is missing
Distinguish speech or other sound picked up by the phone’s microphone from audio playing inside another Android app. These are different capture paths: a restriction on capturing app playback does not, by itself, explain a silent ordinary microphone.
- Phone microphone: Check microphone permission, Android’s microphone privacy control, and Larix’s selected audio source.
- External microphone or mixer: Check that the phone recognizes the accessory and Larix has selected the intended input.
- Audio from another app: Check Android-version limits and Larix’s Media sounds setting.
Then determine whether the sound is missing at capture or only after it reaches YouTube. A short test, a local recording if available, YouTube Live Control Room’s incoming preview, and playback on a separate device can help isolate the stage.
Check Android microphone permission and privacy
- Open Settings > Apps > Larix Broadcaster > Permissions > Microphone and allow microphone access. Android Help explains that microphone permission allows an app to record audio; if permission is denied, Larix cannot use the microphone while in use.
- Check Android’s system-wide microphone control. On supported devices, look under Settings > Security & privacy > Privacy controls for the microphone access control, and turn it on if it is off.
- Return to Larix and make a short test. Change one setting at a time so you can tell which change affects the result.
Menu names and locations can differ by Android version and phone manufacturer. Check the equivalent permission and privacy controls if your device uses different labels.
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Confirm Larix is using the intended audio source
- Open Larix Broadcaster > Settings > Audio and inspect Audio source.
- For the built-in microphone, select an appropriate built-in source. For an external microphone or mixer, connect it before selecting or testing the input.
- Make a short test and listen to it locally if a recording is available.
Larix’s Google Play developer guidance recommends trying the Audio source setting when an input is not detected. For some external devices, it also suggests trying a higher sample rate such as 48000. That is a troubleshooting suggestion, not a universal requirement or guaranteed fix; test it only when relevant to your external input, and change one setting at a time.
If you want to stream audio playing in another app
Android’s support for capturing another app’s audio depends on the Android version and on whether the source app permits external recording. Softvelum’s Larix FAQ says Android 9 or earlier restricts apps from capturing other apps’ audio. On Android 10, media capture works only for apps that support external recording.
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For a supported source on Android 10, check Larix > Audio > Sound settings > Media sounds. If the source app does not support external recording, changing Larix’s microphone source will not make that app’s playback capturable.
If you’re using a headset, USB microphone, or mixer
- Reconnect the accessory and check that its connector and any adapter are appropriate for the phone.
- Confirm the phone recognizes the accessory, then check Larix’s Audio source selection. A connector that fits physically does not prove the phone accepts the signal or that Larix selected it.
- If the input is a mixer feed, verify that the mixer is sending audio to the phone’s input, rather than assuming that a headphone connection will carry the intended signal.
YouTube’s encoder guidance tells users to connect and set up microphones or headsets with the encoder. A user report on Larix’s Google Play listing describes a Pixel 3a not always detecting a line feed through its headphone jack. That individual report is a reason to verify input detection—not evidence of a general Pixel compatibility problem.
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If the phone does not recognize the input, a compatible external microphone, such as a USB-C lavalier, may be an alternative capture device. Check compatibility with your phone and setup before buying one. Replacing a microphone will not fix denied permission or a YouTube-side configuration problem.
Work out whether the problem is capture or the YouTube handoff
- Make a brief test and check whether Larix indicates audio activity. If you can, listen to a local recording as well.
- Open the stream’s incoming preview in YouTube Live Control Room and listen from a separate playback device.
- If the local capture is silent, return to Android permissions, privacy controls, and Larix’s selected input.
- If the local capture has sound but YouTube playback is silent, check the encoder’s routing and stream connection settings. YouTube’s encoder instructions call for entering the YouTube Live server URL and stream key in the encoder.
This comparison is a practical way to narrow down where sound disappears, not a Larix-specific diagnostic procedure validated by YouTube. YouTube’s instructions describe encoder setup but do not provide a Larix-specific sound-meter diagnosis.
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Common symptoms and what to check
| What you observe | What to check next |
|---|---|
| Larix cannot use the built-in microphone | Allow Microphone permission for Larix and check Android’s system-wide microphone control. |
| Built-in microphone works, but an external mic or mixer is silent | Reconnect the accessory, confirm phone recognition, and select the intended Larix Audio source. For some external devices, Larix’s developer guidance suggests testing a higher sample rate such as 48000. |
| Speech is captured, but sound playing in another app is not | Check the Android version, whether the source app supports external recording, and Larix’s Media sounds setting. |
| Local recording has audio, but YouTube playback does not | Check encoder routing and the YouTube server URL and stream key, then compare the Live Control Room preview with playback on another device. |
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