谷歌的例子最好地说明了这个问题：
https://developers.google.com/youtube/youtube_player_demo https://developers.google.com/youtube/youtube_player_demo
更改“速率”，您将看到视频速率/速度没有改变。
不知道为什么setPlaybackRate不起作用YouTube 播放器演示网站 https://developers.google.com/youtube/youtube_player_demo，但如果你尝试一下，它肯定会起作用。
这是我使用的代码，您可以检查工作中的jsfiddle https://jsfiddle.net/MauricioSOes/m96g7wsc/:
// 2. This code loads the IFrame Player API code asynchronously.
var tag = document.createElement('script');
tag.src = "https://www.youtube.com/iframe_api";
var firstScriptTag = document.getElementsByTagName('script')[0];
firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);
// 3. This function creates an <iframe> (and YouTube player)
// after the API code downloads.
var player;
function onYouTubeIframeAPIReady() {
player = new YT.Player('player', {
height: '360',
width: '640',
videoId: '00vnln25HBg',
playerVars: {
'autoplay': 1,
'loop': 1,
'mute': 1
},
events: {
'onReady': onPlayerReady,
'onStateChange': onPlayerStateChange
}
});
}
// 4. The API will call this function when the video player is ready.
function onPlayerReady(event) {
event.target.playVideo();
}
// 5. The API calls this function when the player's state changes.
// Here I set the "setPlaybackRate" value to "2".
function onPlayerStateChange(event) {
player.setPlaybackRate(2);
}
function stopVideo() {
player.stopVideo();
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script>
<div id="player"></div>
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