    <script type="text/javascript">
      const message = document.getElementById('message');
      const transcode = async ({ target: { files } }) => {
        const IN_FILE_NAME = 'video.avi';
        const OUT_FILE_NAME = 'video.webm';
        const args = ['-i', IN_FILE_NAME, OUT_FILE_NAME];
        message.innerHTML = 'Writing file to MEMFS';
        const data = new Uint8Array(await readFromBlobOrFile(files[0]));
        const now = Date.now();
        console.time(`[${now}] ${files[0].name} execution