Taro.chooseVideo选择视频后返回的文件路径如何转成base64

[Jidahan]

相关平台

React Native

使用框架: React

复现步骤

 Taro.chooseVideo({
        sourceType: ['album','camera'],
        maxDuration: 8,
        camera: 'front',
        success: function (res) {
          res.tempFilePath.replace('.mov', '.mp4')
                    var file = new File([res.tempFilePath], "video.mp4" ,{type: "video/mp4", lastModified: new Date});
                    console.log(file);
                    const fileReader = new FileReader()
                    fileReader.readAsDataURL(file)
                    fileReader.onload = function () { 
                      const base64 = this.result.substring(this.result.indexOf(',') 1)
                      console.log(base64);
          }
       }

期望结果

选择视频后，最后返回一个base64

实际结果

我现在是这样写的，虽然最后能输出一个很像base64的编码，但是解码后是坏的不能用

环境信息

Taro v3.3.2


  Taro CLI 3.3.2 environment info:
    System:
      OS: macOS 11.5.1
      Shell: 3.2.57 - /bin/bash
    Binaries:
      Node: 14.17.4 - /usr/local/bin/node
      Yarn: 1.22.11 - /usr/local/bin/yarn
      npm: 6.14.14 - /usr/local/bin/npm
    npmPackages:
      @tarojs/components: 3.3.2 => 3.3.2 
      @tarojs/mini-runner: 3.3.2 => 3.3.2 
      @tarojs/react: 3.3.2 => 3.3.2 
      @tarojs/runtime: 3.3.2 => 3.3.2 
      @tarojs/taro: 3.3.2 => 3.3.2 
      @tarojs/webpack-runner: 3.3.2 => 3.3.2 
      babel-preset-taro: 3.3.2 => 3.3.2 
      eslint-config-taro: 3.3.2 => 3.3.2 
      react: ^17.0.0 => 17.0.2 
      react-native: ^0.64.0 => 0.64.2 

[zhiqingchen]

https://github.com/tanersener/react-native-ffmpeg
可对视频做转码，再转base64