HTML5 Video

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本文介绍了HTML5中用于展示视频的标准与元素，探讨了不同浏览器对于视频格式的支持情况，并提供了使用HTML5视频标签的基本示例及如何通过JavaScript操控视频播放。

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http://www.w3schools.com/html/html5_video.asp

Many modern websites show videos. HTML5 provides a standard for showing them.

Video on the Web

Before HTML5, there was no standard for showing videos/movies on web pages.

Before HTML5, videos could only be played with a plug-in (like flash). However, different browsers supported different plug-ins.

HTML5 defines a new element which specifies a standard way to embed a video or movie on a web page: the <video> element.

Browser Support

Internet Explorer 9+, Firefox, Opera, Chrome, and Safari support the <video> element.

Note: Internet Explorer 8 and earlier versions, do not support the <video> element.

HTML5 Video - How It Works

To show a video in HTML5, this is all you need:

<!DOCTYPE html>
<html>
<body>

<video width="320" height="240" controls>
  <source src="movie.mp4" type="http://www.w3schools.com/html/video/mp4">
  <source src="movie.ogg" type="http://www.w3schools.com/html/video/ogg">
  Your browser does not support the video tag.
</video>

</body>
</html>

The control attribute adds video controls, like play, pause, and volume.

It is also a good idea to always include width and height attributes. If height and width are set, the space required for the video is reserved when the page is loaded. However, without these attributes, the browser does not know the size of the video, and cannot reserve the appropriate space to it. The effect will be that the page layout will change during loading (while the video loads).

You should also insert text content between the <video> and </video> tags for browsers that do not support the <video> element.

The <video> element allows multiple <source> elements. <source> elements can link to different video files. The browser will use the first recognized format.

Video Formats and Browser Support

Currently, there are 3 supported video formats for the <video> element: MP4, WebM, and Ogg:

Browser	MP4	WebM	Ogg
Internet Explorer	YES	NO	NO
Chrome	YES	YES	YES
Firefox	NO Update: Firefox 21 running on Windows 7, Windows 8, Windows Vista, and Android now supports MP4	YES	YES
Safari	YES	NO	NO
Opera	NO	YES	YES

MP4 = MPEG 4 files with H264 video codec and AAC audio codec
WebM = WebM files with VP8 video codec and Vorbis audio codec
Ogg = Ogg files with Theora video codec and Vorbis audio codec

MIME Types for Video Formats

Format	MIME-type
MP4	video/mp4
WebM	video/webm
Ogg	video/ogg

HTML5 <video> - DOM Methods and Properties

HTML5 has DOM methods, properties, and events for the <video> and <audio> elements.

These methods, properties, and events allow you to manipulate <video> and <audio> elements using JavaScript.

There are methods for playing, pausing, and loading, for example and there are properties (like duration and volume). There are also DOM events that can notify you when the <video> element begins to play, is paused, is ended, etc.

The example below illustrate, in a simple way, how to address a <video> element, read and set properties, and call methods.

Example 1

Create simple play/pause + resize controls for a video:

The example above calls two methods: play() and pause(). It also uses two properties: paused and width.

<!DOCTYPE html> 
<html> 
<body> 

<div style="text-align:center"> 
  <button onclick="playPause()">Play/Pause</button> 
  <button onclick="makeBig()">Big</button>
  <button onclick="makeSmall()">Small</button>
  <button onclick="makeNormal()">Normal</button>
  <br> 
  <video id="video1" width="420">
    <source src="mov_bbb.mp4" type="video/mp4">
    <source src="mov_bbb.ogg" type="video/ogg">
    Your browser does not support HTML5 video.
  </video>
</div> 

<script> 
var myVideo=document.getElementById("video1"); 

function playPause()
{ 
if (myVideo.paused) 
  myVideo.play(); 
else 
  myVideo.pause(); 
} 

function makeBig()
{ 
myVideo.width=560; 
} 

function makeSmall()
{ 
myVideo.width=320; 
} 

function makeNormal()
{ 
myVideo.width=420; 
} 
</script> 

<p>Video courtesy of <a href="http://www.bigbuckbunny.org/" target="_blank">Big Buck Bunny</a>.</p>
</body> 
</html>

For a full reference go to our HTML5 Audio/Video DOM Reference .

HTML5 Video Tags

Tag	Description
<video>	Defines a video or movie
<source>	Defines multiple media resources for media elements, such as <video> and <audio>
<track>	Defines text tracks in media players