youtube-tts-reader.js

(() => {

  if (!window.speechSynthesis || !window.SpeechSynthesisUtterance) {
    return alert('Nicht unterstützt!')
  }

  const say = text => {
    if (!text) return
    window.speechSynthesis.cancel()
    const msg = new SpeechSynthesisUtterance(text)
    msg.lang = 'de'
    msg.rate = 2.5
    window.speechSynthesis.speak(msg)
  }

  let lastText = ''

  setInterval(() => {
    const segments = document.querySelectorAll('.ytp-caption-window-bottom .ytp-caption-segment')
    const lastSegment = segments[segments.length-1]
    if (!lastSegment) return

    const text = lastSegment.innerText
    if (text === lastText) return
    else if (text.length < lastText.length) lastText = ''

    const newText = text.slice(lastText.length).trim()
    lastText = text

    say(newText)
  }, 10)

})()