Audio Injection Manual Testing on Real Device Browsers

Audio Injection lets you simulate microphone input on real Android and iOS device browsers during a manual Real Time browser session. Use it to test speech-to-text web apps, voice search on the mobile web, browser-based voice assistants, web-based KYC voice verification, and any other microphone-dependent web feature — without speaking into a physical mic.

With TestMu AI Real Time browser testing, you can either inject a pre-uploaded audio file or stream Live Input directly from your system microphone into the device browser.

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

Web voice search: Validate browser-based voice search and dictation flows.
Speech-to-text web apps: Confirm transcription accuracy on the mobile web.
Web-based KYC: Test identity flows that record a voice sample in the browser.
WebRTC and conferencing: Verify mic capture in browser conferencing tools.
Live exploratory testing: Use Live Input to drive ad-hoc voice interactions on web pages in real time.

Supported Platforms

Platform	Minimum OS Version
Android	Android 13 (SDK 33) and above
iOS	iOS 16 and above

Audio Injection is supported on selected real devices only

Supported File Formats

Format	Max Size
MP3	200 MB
WAV	200 MB

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

Manual Audio Injection Workflow in Browser Testing

Step 1: Enable Audio Injection in Advanced Settings

Go to the TestMu AI Dashboard and open Real Device Browser Testing.
Click Advanced Settings on top.
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.

Step 2: Select a Device and Start Your Session

From the filtered device list, pick a supported Android or iOS real device along with the browser you want to test on.
Click Start to launch the session.

Step 3: Open Media Injection

Inside the live browser session, locate Media Injection in the in-session toolbar.
Click to open the Media Injection panel.
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

Step 4a: Inject an Audio File

Use this mode when you want a deterministic, repeatable input — for example, the same voice query run across many device-browser combinations.

In the Audio tab, select Select Files.
Click Upload and choose an .mp3 or .wav file (up to 200 MB, one file at a time).
Once uploaded, the file appears in your audio library (latest 5 uploaded).
In the browser, navigate to the page that captures microphone input (e.g., tap a voice search icon or Start Recording).
Grant the page mic permission when prompted.
Select the uploaded file and click Inject.
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 browser captures it as if the user were speaking.
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.

tip

Inject and start playback after the page 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, having an unscripted conversation with a web voice assistant or testing custom prompts on the fly.

In the Audio tab, select Inject Live Input.
Grant microphone access to your browser when prompted.
In the device browser, open the page that captures microphone input.
Click Start — your system microphone is now streamed directly into the device's mic.
Speak into your mic. The web page receives your voice in real time.
Click Stop to end the live stream.

note

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

Execution Rules

The web page 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 browsers.
For voice-recognition pages, allow the device 1–2 seconds of silence before injecting speech.
Use Files for repeatable regression runs across device-browser pairs; use Live Input for exploratory and conversational testing.

Audio Injection Manual Testing (App) — Same feature on App Live
Audio Injection on Real Devices (Automation) — Inject audio via Appium / Selenium tests
Browser Testing on Real Devices

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