适用于 HTML5 的 YouTube 隐藏式字幕不起作用 [英] Youtube Closed Caption for HTML5 Not Working
问题描述
我在使用 iframe 播放器在 youtube 视频上显示隐藏式字幕时遇到问题.
这是我正在使用的代码:
<身体><!-- 1. <iframe>(和视频播放器)将替换这个 <div>标签.--><div id="玩家"></div><脚本>//2. 此代码异步加载 IFrame Player API 代码.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. 这个函数创建一个<iframe>(和 YouTube 播放器)//API 代码下载后.var 播放器；函数 onYouTubeIframeAPIReady() {player = new YT.Player('玩家', {高度:'390'，宽度:'640'，videoId: 'M7lc1UVf-VE',事件:{'onReady': onPlayerReady,'onStateChange': onPlayerStateChange}});}//4. 当视频播放器准备就绪时，API 将调用此函数.函数 onPlayerReady(event) {event.target.playVideo();}//5. API 在玩家状态改变时调用该函数.//该函数表示在播放视频时(state=1)，//玩家应该播放六秒钟然后停止.函数 onPlayerStateChange(event) {event.target.loadModule('captions');}</html>这是一个要点 https://gist.github.com/khirakawa/0a81b3039a85b9875b59>
这与 API 参考页面 https://developers.google 上的示例代码基本相同.com/youtube/iframe_api_reference.我在播放器状态更改事件上调用 event.target.loadModule('captions');.
我在他们的 API 参考页面上找不到关于加载字幕模块的任何文档，但我确实在这张票中找到了加载字幕模块的代码 https://code.google.com/p/gdata-issues/issues/detail?id=444
我在 Safari 和 Chrome 上都试过了，但没有成功.
打开youtube时看到的本地存储值为:
yt-remote-connected-devices {"data":"[]","expiration":1412291704974,"creation":1412205304974}yt-remote-device-id {"data":"27238aac-9452-4ae8-9b9f-1e29278e4d3b","expiration":1443741293991,"creation":1412205293992}yt-remote-load-account-screens {"data":"false","expiration":1443741304972,"creation":1412205304972}yt-remote-online-screens {"data":"[]","expiration":1412205364973,"creation":1412205304973}请注意，它缺少字幕条目(我不记得键值是什么，但我知道有两个.一个用于启用字幕，另一个用于字幕设置).
演示页面(https://developers.google.com/youtube/youtube_player_demo)如果您选中 cc_load_policy，则会显示隐藏式字幕，但这只是 AS3 选项.
这在 10 月 6 日有效，但我无法再让它工作了.我不确定 youtube 脚本本身是否发生了变化.
我尝试将 event.target.loadModule('captions'); 移动到 onPlayerReady 处理程序，但这也不起作用.
任何帮助将不胜感激.
我能够通过将 cc_load_policy 设置为 1 来加载字幕.我还意识到 youtube 网站上的示例视频默认使用 <embed>(阅读:Flash)，而不是使用 html5 视频播放器.
我不确定 iframe 播放器何时决定使用 over ，但我确实找到了一个使用 html5 video 标签的视频.即便如此，我还是必须将 cc_load_policy 设置为 1 才能使其工作.loadModule 和 unloadModule 都不再起作用.
我希望这对遇到此问题的其他人有所帮助.
I am having issues displaying closed caption on youtube videos using the iframe player.
Here's the code I am using:
<!DOCTYPE html>
<html>
<body>
<!-- 1. The <iframe> (and video player) will replace this <div> tag. -->
<div id="player"></div>
<script>
// 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: '390',
width: '640',
videoId: 'M7lc1UVf-VE',
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.
// The function indicates that when playing a video (state=1),
// the player should play for six seconds and then stop.
function onPlayerStateChange(event) {
event.target.loadModule('captions');
}
</script>
</body>
</html>
Here's a gist https://gist.github.com/khirakawa/0a81b3039a85b9875b59
This is basically the same sample code that's on the API reference page, https://developers.google.com/youtube/iframe_api_reference. I call event.target.loadModule('captions'); on a player state change event.
I could not find any documentation on their API reference page about loading caption modules, but I did find the code to load the caption module in this ticket https://code.google.com/p/gdata-issues/issues/detail?id=444
I tried this on both Safari and Chrome with no luck.
The local storage values I see when youtube is opened is:
yt-remote-connected-devices {"data":"[]","expiration":1412291704974,"creation":1412205304974}
yt-remote-device-id {"data":"27238aac-9452-4ae8-9b9f-1e29278e4d3b","expiration":1443741293991,"creation":1412205293992}
yt-remote-load-account-screens {"data":"false","expiration":1443741304972,"creation":1412205304972}
yt-remote-online-screens {"data":"[]","expiration":1412205364973,"creation":1412205304973}
Notice that its missing entries for captions (I can't recall what the key values were, but I know there were two of them. One to enable captions and the other for caption settings).
The demo page (https://developers.google.com/youtube/youtube_player_demo) shows closed captions if you check cc_load_policy, but that's only an AS3 option.
This was working on October 6th, but I cannot get it to work anymore. I'm not sure if the youtube script itself changed.
I tried moving event.target.loadModule('captions'); to the onPlayerReady handler, but that didn't work either.
Any help would be greatly appreciated.
I was able to load captions by setting cc_load_policy to 1. I also realized that the sample video on the youtube site defaulting to using <embed> (read: Flash), instead of using the html5 video player.
I am not certain when the iframe player decides to use over , but I did find a video that does use the html5 video tag. Even so, I had to set cc_load_policy to 1 in order for it to work. Neither loadModule nor unloadModule works anymore.
I hope this helps anyone else who ran into this issue.
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