Chromecast是否支持TTML? [英] Does Chromecast support TTML?

问题描述

Chromecast开发者文档说WebVTT和TTML都是受支持的媒体类型: https://developers.google.com/cast/supported_media_types

The Chromecast developer docs say both WebVTT and TTML are Supported Media Types: https://developers.google.com/cast/supported_media_types

在视频元素内的跟踪"标签中使用WebVTT文件时，我看到了字幕:

I see captions when using a WebVTT file in a "track" tag within a video element:

<video id="vid" src="http://myurl">
    <track kind="captions" src="http://10.16.236.23/test.vtt" srclang="en" label="English" default>
</video>

但是当我尝试使用有效的TTML文件执行相同操作时，看不到标题:

But when I try to do the same using a valid TTML file, I don't see captions:

<video id="vid" src="http://myurl">
    <track kind="captions" src="test.ttml" srclang="en" label="English" default>
</video>

当我在调试器控制台中检查video元素时，对于WebVTT示例，我可以看到

When I inspect the video element in the debugger console, for the WebVTT example I can see

document.getElementById('vid').textTracks[0].cues.length;

16

但对于TTML:

document.getElementById('vid').textTracks[0].cues.length;

0

我对此是否正确，还是以其他方式支持TTML?也许Chromecast不支持我的TTML语法?

I am on the right track with this or is TTML supported in a different way? Maybe my TTML syntax is not supported by Chromecast?

推荐答案

根据 Cast Player API ，Chromecast现在支持WebVTT，TTML1和CEA-608(第21行字幕)字幕格式.只需将您的字幕格式的CaptionsType枚举传递到播放器的 enableCaptions() 方法.

According to the Cast Player API, Chromecast now supports WebVTT, TTML1, and CEA-608 (Line 21 Captions) caption formats. Just pass in the CaptionsType enum for your caption format into the player's enableCaptions() method.

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