VideoPlaybackQuality.totalVideoFrames

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规范
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VideoPlaybackQuality 接口的 totalVideoFrames read-only property returns the total number of video frames that have been displayed or dropped since the media was loaded.

句法

value = videoPlaybackQuality.totalVideoFrames;

值

The total number of frames that the <video> element has displayed or dropped since the media was loaded into it. Essentially, this is the number of frames the element would have presented had no problems occurred.

This value is reset when the media is reloaded or replaced.

范例

This example calls getVideoPlaybackQuality() to obtain a VideoPlaybackQuality object, then determines what percentage of frames have been lost by either corruption or being dropped. If that exceeds 10% (0.1), a function called lostFramesThresholdExceeded() is called to, perhaps, update a quality indicator to show an increase in frame loss.

var videoElem = document.getElementById("my_vid");
var quality = videoElem.getVideoPlaybackQuality();
if ((quality.corruptedVideoFrames + quality.droppedVideoFrames)/quality.totalVideoFrames > 0.1) {
  lostFramesThresholdExceeded();
}

A similar algorithm might be used to attempt to switch to a lower-resolution video that requires less bandwidth, in order to avoid dropping frames.

规范

规范	状态	注释
Media Playback Quality The definition of 'VideoPlaybackQuality.totalVideoFrames' in that specification.	编者草案	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
`totalVideoFrames`	Chrome 23	Edge 12	Firefox 42 42 25 — 42 注意事项 Disabled Limited support to an allowed list of sites, for example YouTube, Netflix, and other popular streaming sites. The limitation was removed when Media Source Extensions was enabled by default in Firefox 42. Disabled preference. To change preferences in Firefox, visit about:config.	IE 11	Opera 15	Safari 8	WebView Android 4.4.3	Chrome Android ?	Firefox Android 不支持 No	Opera Android 14	Safari iOS 不支持 No	Samsung Internet Android ?

图例

完整支持
不支持
兼容性未知 ?
实验。期望将来行为有所改变。

用户必须明确启用此特征。

另请参阅

HTMLVideoElement.getVideoPlaybackQuality() method for constructing and returning this interface.

元数据

最后修改： 2019 年 3 月 23 日

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句法

值

范例

规范

浏览器兼容性

图例

另请参阅

相关话题