Detailed explanation of H5 video playback library video.js

This time I will bring you a detailed explanation of the H5 video playback library video.js. What are the precautions when using the H5 video playback library video.js. The following is a practical case, let’s take a look.

video.js is a very popular html5 video playback plug-in. It is very suitable for playing videos on mobile terminals (such as WeChat web pages). It has powerful functions, supports downgrading to flash, and is compatible with IE8. Official website: http://videojs.com/ git&demo: http://files.cnblogs.com/files/stoneniqiu/video-js-5.11.4.zip

Look at the default example:

    <title>Video.js | HTML5 Video Player</title>
    <link>
    <script></script>
    <script></script>
  <video>
    <source>
    <source>
    <source>
    <track></track>
    <!-- Tracks need an ending tag thanks to IE9 -->
    <track></track>
    <!-- Tracks need an ending tag thanks to IE9 -->
    <p>To view this video please enable JavaScript, and consider upgrading to a web browser that <a>supports HTML5 video</a></p>
  </source></source></source></video>

View Code

controls represents the control bar, prload: preloading, and poster represents the initial displayed image. data-set supports using json to set some parameters. Needless to say, source refers to subtitles.

It looks like this, but in reality we have other needs.

No subtitles:

You need to apply novtt’s js in the alt file of the demo. In this way, the letter selection will not appear in the video control bar. Of course you no longer need the track element in the page.

<link><script></script>

Width and height adaptive:

I started to set it myself with css, but found that it had no effect. Video elements are different from ordinary elements. They need to achieve responsive width and height by setting the ratio of internal elements. video.js provides two methods.

js: Set a fluid to true.

 var player = videojs('video', { fluid: true }, function () {
           console.log('Good to go!');           this.play(); // if you don't trust autoplay for some reason  })

But this also requires setting a starting width and height for the video element, otherwise the starting image will not be visible.

css: Styles can be added directly. There are three types: .vjs-fluid, .vjs-4-3, .vjs-16-9. The first one will be calculated automatically, and the latter two specify the ratio. The style also needs to set the starting width and height to display the image

 <video>
        <source>
        <p>  播放视频需要启用 JavaScript，推荐使用<a>支持HTML5</a>的浏览器访问。</p>
    </source></video>

Event attention:

We generally focus on the three events of start, pause, and end

    var player = videojs('video', { }, function () {
           console.log('Good to go!');           //this.play(); // if you don't trust autoplay for some reason       });
       player.on('play', function () {
           console.log('开始/恢复播放');
       });
       player.on('pause', function () {
           console.log('暂停播放');
       });
       player.on('ended', function () {
           console.log('结束播放');
       });

There are also update events :

player.on('timeupdate', function() {
           console.log(player.currentTime());
       });

You can judge whether the video ends by judging whether the current time and the total time are equal:

player.on('timeupdate', function () {  
    // 如果 currentTime() === duration()，则视频已播放完毕
    if (player.duration() != 0 && player.currentTime() === player.duration()) {            // 播放结束        }
    });

Some seniors pointed out that the ended event is not triggered correctly on Android devices (be prepared first).

MIME type setting

The default iis MIME setting does not add the mp4 type. There will be no problem with local playback, but a 404 error will occur when it reaches the server. This requires setting MIME in iis:

##Common video formats:

flv format is to add the associated extension: .flv, content type: application/octet -stream

f4v format is extension: .f4v, content type: application/octet-stream
mp4 format is extension: .mp4, content type: video/mp4
ogv format is extension: . ogv, content type: video/ogg
The webm format is extension: .webm, content type: video/webm
After setting, restart iis to take effect.

Style customization

The official gave a codepen address http://codepen.io/heff/pen/EarCt which you can edit and play with. Mainly the play button, control bar and

progress bar. The default is as above.

There is also this one: http://codepen.io/zanechua/pen/GozrNe SublimeVideo.

Flash Settings

Playback Technology is used to play video or audio files in browsers or plug-ins. If it is h5, it will use video or audio elements. If it is flash, it will define a flash player. Not only flash, but also supports Silverlight, Quicktime and other technologies for playback. Data-setup can be defined directly in the element. Specify supported technologies.

<video>or<p style="text-align: left;">Use JavaScript<a href="http://www.php.cn/code/7565.html" target="_blank">: </a></p>
<pre class="brush:php;toolbar:false">videojs("videoID", {
  techOrder: ["html5", "flash", "other supported tech"]
});

The default rule here is that the first technology will be used to play, and if it is not possible, the subsequent options will be used. For example, if html5 is written in the first place above, all videos will be played using html5. If we want to give priority to flash, just put it in front:

 data-setup='{ "techOrder": ["flash","html5"] }'

In the page elements, you will find that video.js gives us the flash object to use.

自动播放：

给video元素加上autoplay属性，或者在js中加入autoplay:true 

 <video> </video>

或

      var player = videojs('video', { autoplay:true }, function () {
           console.log('Good to go!');           //this.play(); // 保险你还可以主动调用play()
       });

自动播放总让人讨厌，反之就是删除autoplay属性或设置为false。

其他：

video.js支持扩展插件，用起来很方便。

       //定义一个插件
        function examplePlugin(options) {            this.on('play', function (e) {
                console.log('playback has started!');
            });
        }        //注册
        videojs.plugin('examplePlugin', examplePlugin);        // 使用
        player.examplePlugin({ exampleOption: true });

插件内部可以直接调用播放器的api。 有一款playlist的插件可以研究下，如过你需要播放列表。https://github.com/brightcove/videojs-playlist  以及 http://videojs.com/advanced/  有这样的效果：

用qq影音转码比较方便，比起什么格式工厂。H.264

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