public AjaxResult videoUploadFile(MultipartFile file){
  try {
    if(null == file || file.isEmpty()){
      return AjaxResult.error("文件為空");
    }
    String ossFilePrefix = StringUtils.genUUID();
    String fileName = ossFilePrefix +"-"+ file.getOriginalFilename();
    String fileurl = AliOssUtils.videoUploadFile(file,fileName);
    AjaxResult ajax = AjaxResult.success();
    ajax.put("fileName", "after_"+fileName);
    ajax.put("url", fileurl);
    return ajax;
  } catch (Exception e) {
    return AjaxResult.error(e.getMessage());
  }
}

public static final String uploadVideo(String baseDir, MultipartFile file, String fileName) throws FileSizeLimitExceededException, IOException {
    File desc = getAbsoluteFile(baseDir, fileName);
    file.transferTo(desc);
    String pathFileName = getPathFileName(baseDir, fileName);
    return pathFileName;
}

public static  boolean toCompressFile(String convertFile,String targetFile){
    try{
        /**將視頻壓縮為 每秒15幀 平均碼率600k 畫面的寬與高 為1280*720*/
        String cutCmd="ffmpeg -i " + convertFile + " -r 15 -b:v 600k  -s 1280x720 "+ targetFile;
        log.info("cutCmd: " + cutCmd);
        runCmd(cutCmd);
        log.info("文件："+convertFile+" 視屏壓縮完成");
    }catch(Exception e){
        e.printStackTrace();
        log.info("壓縮文件出現(xiàn)異常："+e.getMessage());
        return false;
    }
    return true;
}

private static String getFileUrl(String path) throws IOException {
    File file = new File(path);
    FileInputStream fileInputStream = new FileInputStream(file);
    MultipartFile multipartFile1 = new MockMultipartFile(file.getName(), file.getName(), ContentType.APPLICATION_OCTET_STREAM.toString(), fileInputStream);
    uploadFile(multipartFile1, file.getName());
    String url = getUrl(file.getName());
    return url;
}

public static String videoUploadFile(MultipartFile multipartFile, String fileName) throws IOException {
    //存放路徑
    String filePath = FileUploadUtils.uploadVideo(getDefaultBaseDir(), multipartFile, fileName);
    String convertFile = filePath.replace("/profile", getDefaultBaseDir()).replaceAll("http://", "/");
    //字符串第一個字符最后出現(xiàn)的下標
    int lastIndex = convertFile.lastIndexOf("/");
    StringBuilder sb = new StringBuilder(convertFile);
    String convertFile1 = sb.insert(lastIndex + 1, "after_").toString();
    boolean flag = toCompressFile(convertFile, convertFile1);
    if (!flag) {
        throw new CustomException("文件壓縮出現(xiàn)異常");
    }
    //讀取壓縮后的文件并上傳至阿里云
    String url = getFileUrl(convertFile1);
    //刪除本地暫存文件
    FileUtils.deleteFile(convertFile);
    log.info("文件：" + convertFile + " 刪除成功");
    FileUtils.deleteFile(convertFile1);
    log.info("文件：" + convertFile1 + " 刪除成功");
    return url;
}