Skip to main content

Audio Injection Manual Testing on Real Devices

Audio Injection lets you simulate microphone input on real Android and iOS devices during a manual App Live session. Use it to test speech-to-text, voice commands, voice assistants, in-app recording, KYC voice verification, and any other microphone-dependent feature — without speaking into a physical mic.

With TestMu AI App Live, you can either inject a pre-uploaded audio file or stream Live Input directly from your system microphone into the device under test.

To enable it for your organization, please contact us via 24×7 chat support or you can also drop a mail to [email protected].

Use Cases​

  • Voice command testing: Validate voice assistants and in-app voice search.
  • Speech-to-text validation: Confirm transcription accuracy across devices.
  • In-app audio recording: Verify that the app captures and stores microphone input correctly.
  • KYC and voice verification: Test identity flows that require a recorded voice sample.
  • Live conversational testing: Use Live Input to drive ad-hoc, interactive voice flows in real time.

Supported Platforms​

PlatformMinimum OS Version
AndroidAndroid 13 (SDK 33) and above
iOSiOS 16 and above

Audio Injection is supported on selected real devices only

Supported File Formats​

FormatMax Size
MP3200 MB
WAV200 MB

Files are uploaded one at a time and injected one at a time per session.

Manual Audio Injection Workflow in App Live​

Step 1: Enable Audio Injection in Advanced Settings​

  1. Go to the TestMu AI Dashboard and open Real Device App Testing.
  2. Click Advanced Settings on top.
  3. Toggle Enable Audio Injection on.

Once enabled, the device list is filtered to show only the devices that support Audio Injection for the respective OS.

Enable Audio Injection toggle in Advanced Settings

Step 2: Select a Device and Start Your Session​

  1. From the filtered device list, choose your app and pick a supported Android or iOS real device.
  2. Click Start to launch the session.

Step 3: Open Media Injection​

  1. Inside the live session, locate the Media Injection option in the in-session toolbar.
  2. Click to open the Media Injection panel.
  3. Switch to the Audio tab.

You will see two options:

  • Select Files — inject a pre-recorded audio file
  • Inject Live Input — stream audio from your system microphone in real time

Open Media Injection and switch to the Audio tab

Step 4a: Inject an Audio File​

Use this mode when you want a deterministic, repeatable input — for example, the same voice command run across many devices.

  1. In the Audio tab, select Select Files.
  2. Click Upload and choose an .mp3 or .wav file (up to 200 MB, one file at a time).
  3. Once uploaded, the file appears in your audio library (latest 5 uploaded)
  4. In the app under test, navigate to the screen that captures microphone input (e.g., tap Record or Start Voice Search).
  5. Select the uploaded file and click Inject.
  6. Once a file is injected, the controls are limited to Play and Pause — clicking Play streams the audio into the device's microphone pipeline as live mic input, and the app captures it as if a user were speaking.
  7. To switch audio, select a different file and click Inject on it. Only one file can be injected at a time, and the new file replaces the previously injected one.

Upload and inject an audio file in the Audio tab

tip

Inject and start playback after the app has opened the mic. Some recognizers need 1–2 seconds of silence to initialize before they accept speech.

Step 4b: Use Live Input​

Use this mode when you want to drive the device microphone interactively — for example, holding an unscripted conversation with a voice assistant or testing custom prompts on the fly.

  1. In the Audio tab, select Inject Live Input.
  2. Grant microphone access to your browser when prompted.
  3. In the app under test, open the screen that captures microphone input.
  4. Click Start — your system microphone is now streamed directly into the device's mic.
  5. Speak into your mic. The app receives your voice in real time.
  6. Click Stop to end the live stream.

Stream live mic input from your system into the device

note

Live Input streams from the same browser tab running App Live. Avoid muting your system mic or switching tabs mid-session — the stream will be interrupted.

Execution Rules​

  • The app must be granted microphone permission. Audio Injection does not bypass permission prompts.
  • Only one audio source is active at a time — switching from Files to Live Input (or vice versa) replaces the previous source.
  • For files, only one file can be injected and played at a time.
  • The last injected audio is the active source until you stop it or inject another.

Tips and Best Practices​

  • Keep audio files short (under 5 minutes) for predictable timing.
  • Use 16 kHz mono MP3 or WAV for the most consistent results across Android and iOS.
  • For voice-recognition tests, allow the device 1–2 seconds of silence before injecting speech.
  • Use Files for repeatable regression tests; use Live Input for exploratory and conversational testing.

Need help? Reach out via 24×7 chat support or email [email protected].

Last updated on

Test across 3000+ combinations of browsers, real devices & OS.

Book Demo

Help and Support

Related Articles

On this page