在此页

• 句法
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

这是 实验性技术
检查 浏览器兼容性表格 要小心谨慎在生产中使用这之前。

草案
此页面不完整。

appendWindowStart 特性为 SourceBuffer interface controls the timestamp for the start of the append window , a timestamp range that can be used to filter what media data is appended to the SourceBuffer . Coded media frames with timestamps wthin this range will be appended, whereas those outside the range will be filtered out.

默认值 appendWindowStart is the presentation start time, which is the beginning time of the playable media.

句法

var myAppendWindowStart = sourceBuffer.appendWindowStart;
sourceBuffer.appendWindowStart = 2.0;
					

值

A double, indicating the start time of the append window, in seconds.

异常

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

异常	解释
InvalidAccessError	An attempt was made to set the value to less than 0, or a value greater than or equal to SourceBuffer.appendWindowEnd .
InvalidStateError	This SourceBuffer object is being updated (i.e. its SourceBuffer.updating property is currently true ), or this SourceBuffer has been removed from the MediaSource .

范例

TBD

规范

规范	状态	注释
媒体源扩展 The definition of 'appendWindowStart' in that specification.	推荐	初始定义。

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
appendWindowStart	Chrome 23	Edge 12	Firefox 42	IE 11	Opera 15	Safari 8	WebView Android 4.4.3	Chrome Android 33	Firefox Android 不支持 No	Opera Android 14	Safari iOS 不支持 No	Samsung Internet Android 3.0

图例

完整支持

完整支持

不支持

不支持

见实现注意事项。

用户必须明确启用此特征。

用户必须明确启用此特征。

另请参阅

• MediaSource
• SourceBufferList

元数据

• 最后修改： Dec 5, 2019

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