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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.

This is a short, non-binding explanation of our license. See the License itself for more details.
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.

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