Audio capture (microphone)

Microphone source via openAudioCapture()

Records from the user's microphone with a live VU meter for input-level feedback. Resolves with an opus-in-webm File on browsers that support it (most), or m4a / ogg as a fallback. Useful for voice notes, comment threads, podcast intake forms, accessibility transcription workflows.

Max 60 seconds

Try it: grant microphone permission, click â— Record, watch the VU meter ride your input level. Click â– Stop to add the clip to the queue.

JavaScript API

uploader.openAudioCapture({
    maxDurationSec: 60,                       // auto-stop
    mimeType: 'audio/webm;codecs=opus',       // optional
    fileName: 'voice-note.webm'               // optional
}).then(function (file) {
    uploader.addFile(file);
});

Output formats by browser

Chrome / Edge / Opera / Firefox: audio/webm;codecs=opus â€” small, high-quality, universally re-decodable.
Safari: audio/mp4 (m4a) â€” server-side transcoding only required for downstream consumers that don't speak m4a.
Custom: pass mimeType to override the auto-pick.

Auto-transcribe recipe

Pipe the captured file straight into a transcription endpoint via taskComplete:

uploader.on('taskComplete', function (task, result) {
    fetch('/api/transcribe', {
        method: 'POST',
        body: JSON.stringify({ fileGuid: result.fileGuid }),
        headers: { 'Content-Type': 'application/json' }
    }).then(function (r) { return r.json(); })
      .then(function (txt) {
          document.getElementById('transcriptOut').textContent = txt.text;
      });
});