话不多说，代码如下，这种方法比较麻烦但是有效
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。

image.png

二、下载依赖包：

npm i timers

三、代码块

<template>
  <div>
    <form
      target="stop"
      action="上传接口"
      method="post"
      enctype="multipart/form-data"
      style="position:relative;display:inline-block;"
      id="form1"
    >
      <label for="pop_video1">
        <input
          multiple
          style="display:none;"
          ref="changeInput"
          type="file"
          name="file"
          accept="video/*"
          capture="environment"
          @change="changeVideo1"
          id="pop_video1"
        />

        <div class="inputVideo">
          <img src="../assets/add.png" style="width:35px;height:35px;margin:5px" />
        </div>
        <div>
          <div>
            <video
              id="myvideo1"
              :src="videoSrc1"
              style="height:100px;width:200px;margin:0 10px"
              ref="videoId"
              autoplay="true"
              controls
              muted
            ></video>
            <canvas id="canvas1" :width="winWidth1" style="height:100px;width:100px;display:none"></canvas>
          </div>
        </div>
      </label>
    </form>
    <van-button
      style="width:32%;margin-top:3%;margin-left:22%;display:inline-block"
      round
      block
      type="info"
      @click="subMit()"
    >上传</van-button>
    <iframe name="stop" style="display:none;"></iframe>
  </div>
</template>

<script>
import $ from "jquery";
import { setInterval, clearInterval } from "timers";
import GIF from "../../static/js/gif.js";
export default {
  data() {
    return {
      isShow: false,
      videoSrc1: "",

      File1: "",
      videoSize1: "",

      isAndroid1: false,
      fileAndroid1: {},
      winWidth1: window.innerWidth,
      winHeight1: window.innerHeight,
      gifSetTime1: false,
      gif1: ""
    };
  },
  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.gif1 = new GIF({
      workers: 1,
      quality: 1000,
      width: this.winWidth1,
      height: this.winHeight1,
      workerScript: "../../static/js/gif.worker.js"
    });
  },
  methods: {
    subMit() {
      if (this.File1 !== "") {
        $("#form1").submit();
      }
    },
    changeVideo1(e) {
      this.isshow1 = "none";
      this.disPlay = "block";
      this.isdisplay = "block";
      var file = e.target.files[0];
      // console.log(file.name);

      this.File1 = file.name;
      // console.log(file);

      const video = document.getElementById("myvideo1");
      if (file !== undefined) {
        //判断走向
        if (this.isAndroid1) {
          //视频开始播放
          video.removeEventListener("play", this.videoPlay1, false);
          //视频播放完
          video.removeEventListener("ended", this.videoEnded1, false);
          this.androidFile1(file);
        } else {
          this.iphoneFile1(file);
        }
      }
    },
    //IOS拍摄视频
    iphoneFile1(file) {
      const that = this;
      //视频字节大小
      this.videoSize1 = 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.videoSrc1 = url;
      if (file.size < 2100000 && file.size > 500000) {
        this.uploadVideo1(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
    androidFile1(file) {
      //视频字节大小
      this.videoSize1 = file.size;
      //   this.videoSize = file.size;

      const that = this;
      const video = document.getElementById("myvideo1");
      const canvas = document.getElementById("canvas1");
      var context = canvas.getContext("2d");

      this.gifSetTime1 = true;
      this.gif1.abort();
      this.gif1.frames = [];

      //file转base64
      var reader = new FileReader();
      reader.readAsDataURL(file);
      reader.onload = function() {
        that.videoSrc1 = this.result;
        video.play();
      };
      //视频开始播放
      video.addEventListener("play", this.videoPlay1, false);
      //视频播放完
      video.addEventListener("ended", this.videoEnded1, false);

      this.gif1.on("finished", function(blob) {
        if (that.fileAndroid1.size == blob.size) return;
        // console.log("gif的blob文件", blob);
        that.fileAndroid1 = that.convertBase64UrlToFile(blob);
        that.uploadVideo1(that.fileAndroid1);
      });
    },
    //视频开始播放
    videoPlay1() {
      const that = this;
      const video = document.getElementById("myvideo1");
      const canvas = document.getElementById("canvas1");
      var context = canvas.getContext("2d");
      // console.log("视频时长1", 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.winWidth1, that.winHeight1);
        that.gif1.addFrame(context, {
          copy: true
        });
        if (that.gifSetTime1 == false) {
          clearInterval(times);
        }
      }, 200);
    },
    //视频播放完
    videoEnded1() {
      this.gifSetTime1 = false;
      // console.log("视频播放完毕1！");
      this.gif1.render();
    },
    //上传视频
    uploadVideo1(file) {
      alert(file.size, 1);

      // 保存和提交置灰
    }
  }
};
</script>
<style scoped>
</style>