在此页

• 句法
• 范例
• 浏览器兼容性
• 另请参阅
• 相关话题

过时
This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.

trackDefaults 特性为 SourceBuffer interface specifies the default values to use if kind, label, and/or language information is not available in the initialization segment of the media to be appended to the SourceBuffer .

句法

var myTrackDefaults = sourceBuffer.trackDefaults;
sourceBuffer.trackDefaults = myTrackDefaultList;
					

值

A TrackDefaultList 对象。

异常

The following exceptions may be thrown when setting a new value for this property.

异常	解释
InvalidStateError	One or more of the SourceBuffer 对象在 MediaSource.sourceBuffers are being updated (i.e. their SourceBuffer.updating property is currently true ), or this SourceBuffer has been removed from the MediaSource .

范例

TBD

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
trackDefaults 弃用 非标	Chrome ?	Edge ?	Firefox 不支持 No	IE ?	Opera ?	Safari ?	WebView Android ?	Chrome Android ?	Firefox Android 不支持 No	Opera Android ?	Safari iOS 不支持 No	Samsung Internet Android ?

图例

不支持

不支持

兼容性未知 ?

兼容性未知

非标。预期跨浏览器支持较差。

弃用。不要用于新网站。

弃用。不要用于新网站。

另请参阅

• MediaSource
• SourceBufferList

元数据

• 最后修改： Jan 29, 2020

相关话题

1. Media Source Extensions API
2. SourceBuffer
3. 特性

   1. appendWindowEnd
   2. appendWindowStart
   3. audioTracks
   4. buffered
   5. mode
   6. textTracks
   7. timestampOffset
   8. trackDefaults
   9. updating
   10. videoTracks
4. 方法

   1. abort()
   2. appendBuffer()
   3. appendBufferAsync()
   4. appendStream()
   5. changeType()
   6. remove()
   7. removeAsync()
5. 继承：

   1. EventTarget
6. Related pages for Media Source Extensions

   1. HTMLVideoElement.getVideoPlaybackQuality()
   2. MediaSource
   3. SourceBufferList
   4. TextTrack.sourceBuffer
   5. TrackDefault
   6. TrackDefaultList
   7. URL.createObjectURL()
   8. VideoPlaybackQuality
   9. VideoTrack.sourceBuffer