wx.chooseVideo({

      sourceType: ['album','camera'],

      maxDuration: 3,

      camera: 'back',

      compressed:true,

      success(res) {

        console.log(res)

        that.setData({ video_src: res.tempFilePath });

      }

    })

返回的临时文件预览看起来都是压缩过的 很模糊，微信版本8.0.2，基础库2.16.0