ource of the video
        sources.forEach((source, i) => {
          const src = source.getAttribute('src');
          if(src.match(/^data:video.*;base64$/)) {
            const nextSrc = sources[i+1]?.getAttribute('src');
            video.setAttribute('src', `${src},${nextSrc}`);
          }
        });
      }

      function fixBase64VideoBackground(event) {
        // Analyze all slides backgrounds
        for (const slide of Reveal.getBackgroundsElement().querySelectorAll('.slide-background')) {
    