默认接收器上的 Chromecast WebVTT 字幕

Question

所以我正在尝试使用默认的 chrome 发件人应用程序为 chromecast 设置隐藏式字幕，根据文档，这应该是可能的，as seen here。我不明白为什么我的代码不起作用。它与提供的示例代码几乎相同。
snipper 可能无法工作，因为它太沙盒化了，请在此处的正常 html 页面中查看： Click!
首先应使用顶部按钮连接他们的 chromecast，然后单击 "load video"。

我的代码：

var suburl = 'https://cors-anywhere.herokuapp.com/brenopolanski.com/html5-video-webvtt-example/MIB2-subtitles-pt-BR.vtt';
var mediaurl = 'https://cors-anywhere.herokuapp.com/www.w3schools.com/html/mov_bbb.mp4';
var mediaInfo;
window['__onGCastApiAvailable'] = function(isAvailable) {
  if (isAvailable) {
    initializeCastApi();
  }
};
initializeCastApi = function() {
  cast.framework.CastContext.getInstance().setOptions({
    receiverApplicationId:
      chrome.cast.media.DEFAULT_MEDIA_RECEIVER_APP_ID
  });
  var englishSubtitle = new chrome.cast.media.Track(1, // track ID
  chrome.cast.media.TrackType.TEXT);
  englishSubtitle.trackContentId = suburl;
  englishSubtitle.trackContentType = 'text/vtt';
  englishSubtitle.subtype = chrome.cast.media.TextTrackType.SUBTITLES;
  englishSubtitle.name = 'English Subtitles';
  englishSubtitle.language = 'en-US';
  englishSubtitle.customData = null;

  mediaInfo = new chrome.cast.media.MediaInfo(mediaurl);
  var textTrackStyle = new chrome.cast.media.TextTrackStyle();
  textTrackStyle.foregroundColor = '#80FF0000';

  mediaInfo.contentType = 'video/mp4';
  mediaInfo.metadata = new chrome.cast.media.GenericMediaMetadata();
  mediaInfo.customData = null;
  mediaInfo.streamType = chrome.cast.media.StreamType.BUFFERED;
  mediaInfo.textTrackStyle = textTrackStyle
  mediaInfo.duration = null;
  mediaInfo.tracks = [englishSubtitle];
  mediaInfo.activeTrackIds = [1];
};

function loadVideo() {
  var castSession = cast.framework.CastContext.getInstance().getCurrentSession();
  var request = new chrome.cast.media.LoadRequest(mediaInfo);
  castSession.loadMedia(request).then(
  function() { console.log('Load succeed'); },
  function(errorCode) { console.log('Error code: ' + errorCode); });
}

.cast-button, .load-button {
  max-width: 50px;
  max-height: 50px;
}

<!DOCTYPE html>
<html>
<head>
<title>Sample chromcast</title>
</head>
<body>
<div class="cast-button">
  <google-cast-launcher></google-cast-launcher>
</div>
<button class="load-button" onclick="loadVideo()"> Load video </button>

<script src="https://www.gstatic.com/cv/js/sender/v1/cast_sender.js?loadCastFramework=1"></script>
</body>
</html>

Answer 1

经过大量搜索，我仍然无法确定确切的问题。然而，我偶然发现了这个支持字幕的 ChromeCast SDK 的惊人包装器：https://github.com/Fenny/ChromecastJS/

包括这个演示：https://fenny.github.io/ChromecastJS/demo/index.html

希望这可以帮助到其他人！

默认接收器上的 Chromecast WebVTT 字幕

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chromecast