/**
   * 获取视频长度，生成缩略图
   * */
  public static int createThumb(String videoPath, String thumbPath)
  {
    //System.out.println(System.getProperty("java.home"));
    //FFMPEG_PATH = System.getProperty("user.dir")+"/WebRoot/WEB-INF/plugin/ffmpeg/ffmpeg.exe";
    try {
      /**
       * 获取视频时长，不需要的话可以只留 Runtime.getRunti... 一句
       * */
      int time = Integer.valueOf(CtrlFtpFile.getMediaTime(videoPath));
      if(time<=0)
        throw new IOException("长度过短");
          Runtime.getRuntime().exec(getCmdStr(videoPath, thumbPath));
          return time;
      } catch (IOException e) {
          e.printStackTrace();
      return 0;
      }
  }
  public static void main(String[] args) throws Exception
  {
    System.out.println(createThumb("F:\\aaa.rmvb" , "F:\\b.jpg"));
  }
  /**
   * ffmpeg 地址
   * */
  private static String FFMPEG_PATH = "D:/ffmpeg/ffmpeg.exe";
  /**
   * 生成 CMD 命令
   * */
  private static String getCmdStr(String videoPath ,String thumbPath)
  {
     return FFMPEG_PATH + " -i " + videoPath + "  -ss 0.5 -vframes 1 -r 1 -ac 1 -ab 2 -s 160*120 -f  image2 " + thumbPath;
  }