Resample audio to 16kHz

For using Whisper, Whisper.cpp, @remotion/install-whisper-cpp and Whisper.wasm, you need to provide a 16-bit, 16KHz, WAVE audio file.

This page describes approaches for converting your audio in the browser and on the server.

In the browser

You can use convertMedia() to convert any of the supported video and audio formats and resample it to 16kHz.

💼 Important @remotion/webcodecs License Disclaimer

This package is licensed under the Remotion License.
We consider a team of 4 or more people a "company".

For "companies": A Remotion Company license needs to be obtained to use this package.
In a future version of @remotion/webcodecs, this package will also require the purchase of a newly created "WebCodecs Conversion Seat". Get in touch with us if you are planning to use this package.

For individuals and teams up to 3: You can use this package for free.

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Resample audio to 16kHz
tsx
import {convertMedia, canReencodeAudioTrack} from '@remotion/webcodecs';
 
const output = await convertMedia({
  src: 'https://example.com/input.mp4',
  container: 'wav',
  onAudioTrack: async ({track}) => {
    if (
      await canReencodeAudioTrack({
        audioCodec: 'wav',
        track,
        // Ignore this, bitrate is not used for WAV files
        bitrate: 128000,
        sampleRate: 16000,
      })
    ) {
      return {
        type: 'reencode',
        audioCodec: 'wav',
        bitrate: 128000,
        sampleRate: 16000,
      };
    }
 
    // If this conversion is not supported, return an error
    return {
      type: 'fail',
    };
  },
});
 
const blob = await output.save(); // returns a `Blob`

On the server

You can use ffmpeg to convert your audio to a 16-bit, 16KHz, WAVE file.

bash
ffmpeg -i /path/to/audio.mp4 -ar 16000 /path/to/audio.wav -y

If you don't want to install FFmpeg, you can also use the smaller FFmpeg binary provided by Remotion.

bash
npx remotion ffmpeg -i input.mp4 -ar 16000 output.wav -y

On remotion.dev/convert

If you are looking for a GUI, remotion.dev/convert is our free offering that allows you to convert your audio to a 16-bit, 16KHz, WAVE file, powered by @remotion/webcodecs, offline and fast.