Greasy Fork

I learned a lot from this script and thank you for that. I would suggest a slight modification to function set_zoom so it can handle wide screens - the videos would be zoomed by cropping top and bottom parts of the videos. Something like this:

function set_zoom(video, cw, ch) {
  var vs = video.style;
  var video_aspect = video.videoWidth/video.videoHeight;
  var containing_aspect = cw/ch;

  // Don't zoom if the endscreen is showing
  if(!video.ended) {
    var vh = 0, vw = 0, vt = 0, vl = 0;
    if(video_aspect < containing_aspect) {
      vw = cw;
      vh = vw / video_aspect;
    } else {
      vh = ch;
      vw = video_aspect * vh;
    }
    vt = (ch-vh)/2;
    vl = (cw-vw)/2;
    vs.height = vh + "px";
    vs.width = vw + "px";
    vs.top = vt + "px";
    vs.left = vl + "px";
  } else {
    debug_log("Video has ended. Not setting zoom. (Otherwise we mess with the endscreen.)");
  }
}

Of course it's stripped from functionality I didn't need but the idea is preserved.