Google AMP - 视频

amp 中的 Amp-video 是用于播放直接视频嵌入的标准 html5 视频。在本章中，让我们了解如何使用 amp-video。

要使用 amp-video，我们需要添加以下脚本 −

<script async custom-element = "amp-video"
src = "https://cdn.ampproject.org/v0/amp-video-0.1.js">
</script>

Amp-video 具有 src 属性，该属性包含要加载的视频资源，由 amp 在运行时延迟加载。此外，所有功能几乎与 html5 video 标签相同。

以下是要添加到 amp video 的节点 −

• Source − 您可以使用此标签添加要播放的不同媒体文件。

• Track − 此标签可让您为视频启用字幕。

• Placeholder − 此占位符标签将在视频开始前显示内容。

• Fallback − 当浏览器不支持 HTML5 video 时，将调用此标签。

amp-video 标签的格式

此处显示 amp-video 标签的格式 −

<amp-video controls width = "640" height = "360" 
   layout = "responsive" poster = "images/videoposter.png">
   <source src = "video/bunny.webm" type = "video/webm" />
   <source src = "video/samplevideo.mp4" type = "video/mp4" />
   
   <div fallback>
      <p>This browser does not support the video element.</p>
   </div>
</amp-video>

让我们使用如下所示的工作示例来了解 amp-video −

示例

<!doctype html>
<html amp lang = "en">
   <head>
      <meta charset = "utf-8">
      <script async src = "https://cdn.ampproject.org/v0.js"></script>
      <title>Google AMP - Amp Video</title>
      <link rel = "canonical" href =  "http://example.ampproject.org/article-metadata.html">
      <meta name = "viewport" content = "width = device-width, minimum-scale = 1,initial-scale=1">

      <style amp-boilerplate>
         body {
            -webkit-animation:
            -amp-start 8s steps(1,end) 0s 1 normal both;-moz-animation:
            -amp-start 8s steps(1,end) 0s 1 normal both;-ms-animation:
            -amp-start 8s steps(1,end) 0s 1 normal both;animation:
            -amp-start 8s steps(1,end) 0s 1 normal both}
         @-webkit-keyframes 
         -amp-start{from{visibility:hidden}to{visibility:visible}}@-moz-keyframes 
         -amp-start{from{visibility:hidden}to{visibility:visible}}@-ms-keyframes 
         -amp-start{from{visibility:hidden}to{visibility:visible}}@-o-keyframes 
         -amp-start{from{visibility:hidden}to{visibility:visible}}@keyframes 
         -amp-start{from{visibility:hidden}to{visibility:visible}}
      </style>
      <noscript>
         <style amp-boilerplate>
            body {
               -webkit-animation:none;
               -moz-animation:none;
               -ms-animation:none;
               animation:none
            }
         </style>
      </noscript>

      <script async custom-element = "amp-video" 
         src = "https://cdn.ampproject.org/v0/amp-video-0.1.js">
      </script>
   </head>
   <body>
      <h3>Google AMP - Amp Video</h3>
      <amp-video controls
         width = "640"
         height = "360"
         layout = "responsive"
         poster = "images/videoposter.png">
         <source src = "video/bunny.webm" type = "video/webm" />
         <source src = "video/samplevideo.mp4" type = "video/mp4" />
         
         <div fallback>
            <p>This browser does not support the video element.</p>
         </div>
      </amp-video>
   </body>
</html>

输出

上述代码的输出如下所示 −

amp-video 可用的属性

amp-video 可用的属性列在此处的表格中 −

自动播放 AMP 视频

我们可以使用autoplay 属性，以防我们需要自动播放视频。此功能将根据浏览器支持情况工作。请注意，自动播放时视频将处于静音状态。当用户点击视频时，它将取消静音。

让我们借助下面给出的工作示例来使用自动播放功能 −

示例

<!doctype html>
<html amp lang = "en">
   <head>
      <meta charset = "utf-8">
      <script async src = "https://cdn.ampproject.org/v0.js"></script>
      <title>Google AMP - Amp Video</title>
      <link rel = "canonical" href = "http://example.ampproject.org/article-metadata.html">

      <meta name = "viewport" content = "width=device-width,minimum-scale = 1, initial-scale = 1">

      <style amp-boilerplate>
         body {
            -webkit-animation:
            -amp-start 8s steps(1,end) 0s 1 normal both;
            -moz-animation:-amp-start 8s steps(1,end) 0s 1 normal both;-ms-animation:
            -amp-start 8s steps(1,end) 0s 1 normal both;animation:
            -amp-start 8s steps(1,end) 0s 1 normal both
         }
         @-webkit-keyframes 
         -amp-start{from{visibility:hidden}to{visibility:visible}}@-moz-keyframes 
         -amp-start{from{visibility:hidden}to{visibility:visible}}@-ms-keyframes 
         -amp-start{from{visibility:hidden}to{visibility:visible}}@-o-keyframes 
         -amp-start{from{visibility:hidden}to{visibility:visible}}@keyframes 
         -amp-start{from{visibility:hidden}to{visibility:visible}}
      </style>
      <noscript>
         <style amp-boilerplate>
            body{
               -webkit-animation:none;
               -moz-animation:none;
               -ms-animation:none;
               animation:none
            }
         </style>
      </noscript>

      <script async custom-element = "amp-video" src = "
         https://cdn.ampproject.org/v0/amp-video-0.1.js">
      </script>
   </head>
   <body>
      <h3>Google AMP - Amp Video Autoplay</h3>
      <amp-video controls
         width = "640"
         height = "360"
         layout = "responsive"
         poster = "images/videoposter.png" autoplay>
         <source src = "video/bunny.webm" type = "video/webm" />
         <source src = "video/samplevideo.mp4" type = "video/mp4" />
         <div fallback>
            <p>This browser does not support the video element.</p>
         </div>
      </amp-video>
   </body>
</html>

您可以通过添加控件属性来激活视频控件，如以下代码所示 −

<amp-video controls
   width = "640"
   height = "360"
   layout = "responsive"
   poster = "images/videoposter.png" autoplay>
   <source src = "video/bunny.webm" type = "video/webm" />
   <source src = "video/samplevideo.mp4" type = "video/mp4" />
   <div fallback>
      <p>This browser does not support the video element.</p>
   </div>
</amp-video>