/**
     * 擷取視訊某些幀轉換為圖片
     *
     * @author 周化益
     * @param entity 實體Class
     * @param entityId 記錄id
     * @param fileName 檔名
     * @param fileSuffix 檔案字尾
     */
	public synchronized static <T> void capturePhotoFromVideo(Class<T> entity, long entityId, String fileName) {
		Properties props = initConfigFile();
		if (null != props){
			String inFilePath = null;//本地檔案
			String outFilePath = null;//視訊擷取的圖片
			
			inFilePath = CommonUtil.uploadPath() + "upload/" + entity.getSimpleName() + "/" + entityId + "/" + fileName;
			File file = new File(inFilePath);
			
			if (file.exists()) {
				Process process = null;
			    int duration = CommonUtil.getMediaDuration(file.getPath());
			    
			    duration = duration/120000;//視訊總時間的三分之一處擷取
			    
				StringBuffer command = new StringBuffer();				
				File thumbFile = new File(CommonUtil.uploadPath()+ "upload/",entity.getSimpleName() + "/" + entityId);
				if (!thumbFile.exists()){
					thumbFile.mkdirs();
				}
				
				String path = FileLoad.class.getResource("").getPath();
				
				int end = path.lastIndexOf("com"); 
				int dot = fileName.lastIndexOf('.'); 
				
				outFilePath = thumbFile + "/" + fileName.substring(0,dot) + ".jpg";
				command.append("cmd /c ").append(path.substring(1, end)+"resources/")
				.append("ffmpeg.exe").append(" -i ").append(inFilePath)
				.append(" -y -f image2 -ss ").append(duration).append(" -vframes 1 -s ")
				.append(DEFAULT_VIDEO_PHOTO_RESOLUTION).append(" ").append(outFilePath);	
				
				try {
					System.out.println(command);
					String systemOutText = "抓取視訊圖片所用時間為：";
					process  = execCommand(command.toString(),systemOutText);
				} catch (Exception e) {
					e.printStackTrace();
				} finally{
					if (null != process){
						process.destroy();
					}
				}
			}
		}
	}
	
    /**
     * 生成縮圖
     *
     * @author 周化益
     * @param inFilePath 原始檔
     * @param outFilePath 生成的縮圖檔案
     */
    public synchronized static void makeSmallImage(String inFilePath,String outFilePath){
    	try {
    		String convertPath = " convert.exe";
    		String command = "cmd /c "+getFfrmpegPath()+convertPath+" -resize \"100x100>\" +profile \"*\" "+inFilePath+" "+ outFilePath;
    		String systemOutText = inFilePath+"檔案的縮圖獲取時間:";
    		execCommand(command,systemOutText);
    	} catch (Exception e) {
			e.printStackTrace();
		}
    }
    
    /**
     * 執行命令列語句
     *
     * @author 周化益
     * @param command 命令列語句
     * @param systemOutText 執行後的輸出語句
     */
    public static Process execCommand(String command,String systemOutText){
    	Process process = null;
    	try {
    		long startTime = System.currentTimeMillis();
    		String[] cmdArry = command.split(" ");
    		ProcessBuilder builder = new ProcessBuilder(cmdArry);
    		builder.redirectErrorStream(true);    
    	    process = builder.redirectErrorStream(true).start();
    	    
    	    //防止執行緒堵塞
    	    new PrintStream(process.getInputStream()).start();
    	    
    		BufferedReader br = new BufferedReader(new InputStreamReader(process.getInputStream()));
        	process.waitFor();
        	br.close();
    		long endTime = System.currentTimeMillis();
    		if (null!=systemOutText && !systemOutText.equals("")){
    			System.out.println(systemOutText+(endTime-startTime)+"毫秒");
    		}    		
		} catch (Exception e) {
			e.printStackTrace();
		}
    	return process;
    }
 

/**
	 * 獲取視訊專案根目錄
	 * 
	 * @author zhy
	 * @return
	 */
	public static String uploadPath() {
		String path = CommonUtil.class.getResource("") .getPath();  
		int end = path.lastIndexOf("WEB-INF");  
		path = path.substring(1, end); 
		return path+"/";
	}

/**
	 * 獲取多媒體檔案長度
	 *
	 * @author 周化益
	 * @param filePath 檔案路徑
	 * @return int 檔案長度
	 */
	public synchronized static int getMediaDuration(String filePath){
		int duration = 0;
		int readLen = 0;
		byte[] byteTemp = new byte[5];
		InputStream is = null;
		Process process = null;
		try {
			StringBuffer command = new StringBuffer();
			command.append("cmd /c ").append("MediaInfo.exe").append(" --Inform=General;")
			       .append("\"%Duration%\" \"").append(filePath).append("\"");
			process = Runtime.getRuntime().exec(command.toString());
			is = process.getInputStream();
			command.setLength(0);
			while((readLen = is.read(byteTemp))!=-1){
				command.append(new String(byteTemp,0,readLen));
			}
			if (command.length()>0){
				duration = Integer.parseInt(command.toString().replaceAll("\\s", ""));
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally{
			try {
				if (null!=is){
					is.close();
				}
				if (null!=process){
					process.destroy();
				}
			} catch (Exception e) {
				e.printStackTrace();
			}
		 }
		return duration;
	}