Why doesn't player.setPlaybackQuality() work?

Question

YouTube

Hello everyone, here is the js code:

function onYouTubeIframeAPIReady() {
  player = new YT.Player("video", {
    width: "640",
    height: "360",
    videoId: "",
    playerVars: {
      "controls": 0,
      "rel": 0,
      "disablekb": 0,
      "html5": 1, 
      "iv_load_policy": 3,
      "showinfo": 0,
      "fs": 0
    },
    events: {
      onReady: onPlayerReady,
      onStateChange: onPlayerStateChange,
      onPlaybackQualityChange: onPlayerPlaybackQualityChange
    }
  });
}

function onPlayerStateChange(e) {
  if ( e.data == YT.PlayerState.PLAYING || e.data == YT.PlayerState.PAUSED ) {
    // Выбор качества видео
    $(document).find(".youtube-player").find(".form-settings-quality").on("change", "input", function() {
      e.target.setPlaybackQuality($(this).val());
      console.log(player.getPlaybackQuality());
    })
  }
}

Faced the problem that

e.setPlaybackQuality($(this).val()); // Альтернатива player.setPlaybackQuality($(this).val());

does not change the quality of the video being played (
html code of the radio batan in which I try to change the quality of the video:

<div class="wrapper-radio">
<input type="radio" id="quality-01" name="radio-quality" value="small">
<label for="quality-01"><span></span>240p</label>
</div>

Question: What is the reason for this and how can you still let the user change the quality of the video?

Answer 1

Youtube blocked forced quality switching in early 2018. The documentation says that "Calling a function does not guarantee a change in playback quality."