// 抽幀 (url視頻地址 time00:00:00:00時分秒幀 FPS視頻幀率) 返回抽幀圖片Base64
    getImgBase64(url,time,FPS) {
          var base64URL = ''
          let video = document.createElement('video')
          video.setAttribute('crossOrigin', 'anonymous') //處理跨域
          video.setAttribute('src', url)
          video.currentTime = this.timeToSeconds(time,FPS);
          video.addEventListener('loadeddata', function() {
          let canvas = document.createElement('canvas')
          //使用視頻的寬高作為canvas、預(yù)覽圖的寬高
          let width = video.videoWidth 
          let height = video.videoHeight
          canvas.width = width
          canvas.height = height
          canvas.getContext('2d').drawImage(video, 0, 0, width, height) //繪制canvas
          base64URL = canvas.toDataURL('image/jpeg') //轉(zhuǎn)換為base64，圖片格式默認(rèn)為png，這里修改為jpeg
          // console.log(base64URL.split(",")[1]);
          return base64URL.split(",")[1];
          })
    },
        //時分秒幀 轉(zhuǎn)為秒
        timeToSeconds(time,FPS) {
            // 按小時、分鐘、秒進(jìn)行切割
            const [hours, minutes, seconds,frame] = time.split(':');
            // 計算總共的秒數(shù)
            var second = parseInt(hours) * 3600 + parseInt(minutes) * 60 + parseInt(seconds)+ (1/FPS) * parseInt(frame);
            //若秒數(shù)為0 防止黑幀 賦值0.1
            if(second == 0){
                second = 0.1;
            }
            return second;
        },

    /**
     * 抽幀
     * @param jsonObject
     * @return
     */
    @PostMapping("/getFetchFrame")
    public AjaxResult getFetchFrame(@RequestBody JSONObject jsonObject) {
        String imgStr = jsonObject.getString("imgStr");
        OutputStream out = null;
        BASE64Decoder decoder = new BASE64Decoder();
        try {
            byte[] b = decoder.decodeBuffer(imgStr);
            //文件存儲位置
            String uploadUrl = "C:\\Users\\cdv\\Desktop";
            File testFile = new File(uploadUrl);
            if (!testFile.exists()) {
                testFile.mkdirs();
            }
            String fileName = "frame" + System.currentTimeMillis() + ".jpg";
            String imgFilePath = uploadUrl + "/" + fileName;
            out = new FileOutputStream(imgFilePath);
            out.write(b);
            out.flush();
            return AjaxResult.success();
        } catch (Exception e) {
            logger.error("抽幀失敗！ error : " + e.getMessage());
            return AjaxResult.error("抽幀失敗");
        } finally {
            try {
                if (out != null) {
                    out.close();
                }
            } catch (Exception e2) {
                logger.error("關(guān)閉輸出流失??！ error : " + e2.getMessage());
                return AjaxResult.error("關(guān)閉輸出流失敗");
            }
        }
    }