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vue 录制视频并压缩视频文件的方法

Lucia_Huang 人气:0

文件上传框<input type="file">,除了可以选择文件上传之外,还可以调用摄像头来拍摄照片或者视频并上传。capture属性可以判断前置or后置摄像头。在视频播放的过程中,用canvas定时截取一张图片,然后用gif.js生成一张GIF图,从而完成前端的视频压缩。

我这里使用的是Vue写的,以下是我的流程及代码:

一、下载gif.js相关文件,可以到这里下载,然后将这几个文件放在根目录的static/js里面。

gif.js相关文件及存放路径

二、下载依赖包:

npm i timers

三、在页面中声明:

import { setInterval, clearInterval } from "timers";
import GIF from "../../static/js/gif.js"

四、html代码块:

<template>
 <div>
   <input ref="changeInput" type="file" accept="video/*" capture="user" @change="changeVideo" />
   <div>
    <div>视频大小:{{videoSize}}</div>
    <div>视频时长:{{videoLength}}</div>
    <div>
     <video id="myvideo" :src="videoSrc" :width="winWidth" :height="winHeight" ref="videoId" autoplay="true" controls muted></video>
     <canvas id="canvas" :width="winWidth" :height="winHeight"></canvas>
    </div>
   </div>
 </div>
</template>

五、在页面加载完成时初始化GIF:

mounted(){
  //初始gif
  this.gif = new GIF({
   workers: 1,
   quality: 1000,
   width: window.innerWidth,
   height: window.innerHeight,
   workerScript: '../../static/js/gif.worker.js',
  });
 },

六、当input录制完视频返回页面中,获取到这个视频文件,每次拿到视频文件需要先移除之前的监听:

//input文件走向
  changeVideo(e){
   var file = e.target.files[0];
   const video = document.getElementById('myvideo');
   //视频开始播放
   video.removeEventListener('play', this.videoPlay, false);
   //视频播放完
   video.removeEventListener('ended', this.videoEnded, false); 
   this.androidFile(file);
  },

七、上一步提到的this.androidFile方法,是通过这个视频文件,在页面播放一遍,在这个播放过程处理视频,完成整个转换过程,获取到最终的文件:

//安卓拍摄视频
  androidFile(file){
   //视频字节大小
   this.videoSize = file.size;

   const that = this;
   const video = document.getElementById('myvideo');
   const canvas = document.getElementById('canvas');
   var context = canvas.getContext('2d');

   this.gifSetTime = true;
   this.gif.abort()
   this.gif.frames = [];

   //file转base64
   var reader = new FileReader();
   reader.readAsDataURL(file);
   reader.onload = function () {
    that.videoSrc = this.result;
    video.play();
   }
   //视频开始播放
   video.addEventListener('play', this.videoPlay, false);
   //视频播放完
   video.addEventListener('ended', this.videoEnded, false); 
   //获取到所有的图片并渲染完后执行
   this.gif.on('finished', function(blob) {
    if(that.fileAndroid.size == blob.size) return;
    console.log("gif的blob文件",blob);
    //file
    that.fileAndroid = that.convertBase64UrlToFile(blob);
    //上传视频文件
    that.uploadVideo(that.fileAndroid);
   });
  },

八、步骤七所说的this.videoPlay方法。视频在页面播放过程中,每200毫秒通过canvas截取一张图片,把这些图片一张张给gif.js堆叠:

//视频开始播放
  videoPlay(){
   const that = this;
   const video = document.getElementById('myvideo');
   const canvas = document.getElementById('canvas');
   var context = canvas.getContext('2d');
   console.log("视频时长",video.duration);
   this.videoLength = video.duration;
    //画布上画视频,需要动态地获取它,一帧一帧地画出来
    var times = setInterval(function(){
      context.drawImage(video, 0, 0, that.winWidth, that.winHeight);
      that.gif.addFrame(context, {
       copy: true
      });
      if(that.gifSetTime == false){
       clearInterval(times);
      }
    }, 200);
  },

九、步骤七所说的this.videoEnded方法。视频播放完,通过gif.js将图片堆叠的动态图渲染出来:

//视频播放完
  videoEnded(){
   this.gifSetTime = false;
   console.log("视频播放完毕!")
   this.gif.render();
  },

十、步骤七所说的that.convertBase64UrlToFile方法。将gif.js生成的Blob文件转换成File格式:

//blob to file
  convertBase64UrlToFile(blob) {
   var d = new Date().getTime();
   var type = 'image/gif'
   return new File([blob],"fileGif-" + d + '.gif', {type:type});
  },

最后通过步骤七所说的that.uploadVideo方法,上传图片给服务器:

//上传视频
  uploadVideo(file){
   console.log("上传的视频文件", file)
  },

在这提供我的全部代码,Android的视频文件比较大所以做压缩,而IOS本身存在视频压缩,所以我这里做了区分

<template>
 <div>
   <input ref="changeInput" type="file" accept="video/*" capture="user" @change="changeVideo" />
   <div>
    <div>视频大小:{{videoSize}}</div>
    <div>视频时长:{{videoLength}}</div>
    <div>
     <video id="myvideo" :src="videoSrc" :width="winWidth" :height="winHeight" ref="videoId" autoplay="true" controls muted></video>
     <canvas id="canvas" :width="winWidth" :height="winHeight"></canvas>
    </div>
   </div>
 </div>
</template>

<script>
import { setInterval, clearInterval } from "timers";
import GIF from "../../static/js/gif.js"
export default {
 data(){
  return {
   videoSize: '',
   videoSrc: '',
   videoLength: '',
   isAndroid: false,
   fileAndroid: {},
   winWidth: window.innerWidth,
   winHeight: window.innerHeight,
   gifSetTime: false,
   gif: '',
  }
 },
 created() {
  //判断终端
  var u = navigator.userAgent;
  var isAndroid = u.indexOf('Android') > -1 || u.indexOf('Adr') > -1; //android终端
  var isiOS = !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/); //ios终端
  if(isAndroid){
   console.log('isAndroid')
   this.isAndroid = true;
  }else if(isiOS){
   console.log('isiOS')
   this.isAndroid = false;
  }
 },
 mounted(){
  //初始gif
  this.gif = new GIF({
   workers: 1,
   quality: 1000,
   width: this.winWidth,
   height:this.winHeight,
   workerScript: '../../static/js/gif.worker.js',
  });
 },
 methods:{
  //input文件走向
  changeVideo(e){
   var file = e.target.files[0];
   const video = document.getElementById('myvideo');
   
   if(file !== undefined){
    //判断走向
    if(this.isAndroid){
     //视频开始播放
     video.removeEventListener('play', this.videoPlay, false);
     //视频播放完
     video.removeEventListener('ended', this.videoEnded, false); 
     this.androidFile(file);
    }else{
     this.iphoneFile(file);
    }
   }
  },
  //IOS拍摄视频
  iphoneFile(file){
   const that = this;
   //视频字节大小
   this.videoSize = file.size;
   
   var url = null ; 
   //file转换成blob
   if (window.createObjectURL!=undefined) { // basic
    url = window.createObjectURL(file) ;
   } else if (window.URL!=undefined) { // mozilla(firefox)
    url = window.URL.createObjectURL(file) ;
   } else if (window.webkitURL!=undefined) { // webkit or chrome
    url = window.webkitURL.createObjectURL(file) ;
   }
   this.videoSrc = url;
   if(file.size < 2100000 && file.size > 500000){
    this.uploadVideo(file);
   }else if(file.size >= 2100000){
    this.$vux.toast.text('视频太大,请限制在10秒内');
   }else{
    this.$vux.toast.text('视频录制不能少于5秒');
   }
  },
  //安卓拍摄视频
  androidFile(file){
   //视频字节大小
   this.videoSize = file.size;

   const that = this;
   const video = document.getElementById('myvideo');
   const canvas = document.getElementById('canvas');
   var context = canvas.getContext('2d');

   this.gifSetTime = true;
   this.gif.abort()
   this.gif.frames = [];

   //file转base64
   var reader = new FileReader();
   reader.readAsDataURL(file);
   reader.onload = function () {
    that.videoSrc = this.result;
    video.play();
   }
   //视频开始播放
   video.addEventListener('play', this.videoPlay, false);
   //视频播放完
   video.addEventListener('ended', this.videoEnded, false); 
   
   this.gif.on('finished', function(blob) {
    if(that.fileAndroid.size == blob.size) return;
    console.log("gif的blob文件",blob);
    that.fileAndroid = that.convertBase64UrlToFile(blob);
    that.uploadVideo(that.fileAndroid);
   });
  },
  //视频开始播放
  videoPlay(){
   const that = this;
   const video = document.getElementById('myvideo');
   const canvas = document.getElementById('canvas');
   var context = canvas.getContext('2d');
   console.log("视频时长",video.duration);
   this.videoLength = video.duration;
    //画布上画视频,需要动态地获取它,一帧一帧地画出来
    var times = setInterval(function(){
      context.drawImage(video, 0, 0, that.winWidth, that.winHeight);
      that.gif.addFrame(context, {
       copy: true
      });
      if(that.gifSetTime == false){
       clearInterval(times);
      }
    }, 200);
  },
  //视频播放完
  videoEnded(){
   this.gifSetTime = false;
   console.log("视频播放完毕!")
   this.gif.render();
  },
  //blob to file
  convertBase64UrlToFile(blob) {
   var d = new Date().getTime();
   var type = 'image/gif'
   return new File([blob],"fileGif-" + d + '.gif', {type:type});
  },
  //上传视频
  uploadVideo(file){
   console.log("上传的视频文件", file)
  },
 }
};
</script>
<style scoped>

</style>

试过很多种方法,而这种在移动端浏览器(特别是微信浏览器!)的兼容性是最好的。但是这个生成的视频文件将会失去音频,如果需要音频的可以看我另一篇简书有说明几种方法。有更好的方法欢迎大家留言,互相学习~

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