VideoPlaybackQuality.droppedVideoFrames

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句法
范例
规范
浏览器兼容性
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								droppedVideoFrames

特性为


								VideoPlaybackQuality

interface returns the number of video frames which have been dropped rather than being displayed since the last time the media was loaded into the


								HTMLVideoElement

句法

value = videoPlaybackQuality.droppedVideoFrames;

值

An unsigned 64-bit value indicating the number of frames that have been dropped since the last time the media in the <video> element was loaded or reloaded. This information can be used to determine whether or not to downgrade the video stream to avoid dropping frames.

Frames are typically dropped either before or after decoding them, when it's determined that it will not be possible to draw them to the screen at the correct time.

范例

This example calls getVideoPlaybackQuality() to obtain a VideoPlaybackQuality object, then determines what percentage of frames have been dropped. That value is then presented in an element for the user's reference.

var videoElem = document.getElementById("my_vid");
var percentElem = document.getElementById("percent");
var quality = videoElem.getVideoPlaybackQuality();
var dropPercent = (quality.droppedVideoFrames/quality.totalVideoFrames)*100;
percentElem.innerText = Math.trunc(dropPercent).toString(10);

规范

规范	状态	注释
Media Playback Quality The definition of 'VideoPlaybackQuality.droppedVideoFrames' 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
`droppedVideoFrames`	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, which creates and returns VideoPlaybackQuality 对象

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