Java通过调用FFMPEG获取视频时长

       FFmpeg是一套可以用来记录、转换数字音频、视频,并能将其转化为流的开源计算机程序。采用LGPL或GPL许可证。它提供了录制、转换以及流化音视频的完整解决方案。它包含了非常先进的音频/视频编解码库libavcodec,为了保证高可移植性和编解码质量,libavcodec里很多codec都是从头开发的。

       由此看来FFmpeg很强大,很多主流的音频、视频处理软件都使用了FFmpeg。

       FFmpeg下载下来解压,cmd进入到FFmpeg.exe目录中,即可在命令行下进行各种操作,查看视频信息命令:ffmpeg 视频 -i,如下图:

       D:\ffmpeg\Libs>ffmpeg -i D:\MonitorRecord\monitor_20091222_050948_1.avi

FFmpeg version SVN-r10087, Copyright (c) 2000-2007 Fabrice Bellard, et al.
  configuration: --prefix=f:/svn_build_bins --enable-memalign-hack --enable-shared --disable-static --enable-w32threads --enable-liba52 --enable-avisynth --enable-libamr-nb --enable-libamr-wb --enable-libfaac --enable-libfaad --enable-libgsm --enable-libmp3lame --enable-libogg --enable-libtheora --enable-libvorbis --enable-libx264 --enable-gpl --extra-cflags=-I/usr/local/include --extra-ldflags=-L/usr/local/lib
  libavutil version: 49.5.0
  libavcodec version: 51.40.4
  libavformat version: 51.12.2
  built on Aug 12 2007 11:38:35, gcc: 4.2.1

  Compiled by msn: dev # fastreaming.com, 2007/08/12
  Enjoy it

Input #0, avi, from 'D:\MonitorRecord\monitor_20091222_050948_1.avi':
  Duration: 00:00:25.0, start: 0.000000, bitrate: 619 kb/s
  Stream #0.0: Video: mpeg4, yuv420p, 1620x1100,  1.14 fps(r)
Must supply at least one output file

 

    在Java中执行此操作,解析返回结果,可以得到视频时长等信息。

/**
	 * 获取视频总时间
	 * @param viedo_path    视频路径
	 * @param ffmpeg_path	ffmpeg路径
	 * @return
	 */
	public static int getVideoTime(String video_path, String ffmpeg_path) {
		List<String> commands = new java.util.ArrayList<String>();
		commands.add(ffmpeg_path);
		commands.add("-i");
		commands.add(video_path);
		try {
			ProcessBuilder builder = new ProcessBuilder();
			builder.command(commands);
			final Process p = builder.start();
			
			//从输入流中读取视频信息
	        BufferedReader br = new BufferedReader(new InputStreamReader(p.getErrorStream()));
	        StringBuffer sb = new StringBuffer();
	        String line = "";
            while ((line = br.readLine()) != null) {
                sb.append(line);
            }
	        br.close();
	        
	        //从视频信息中解析时长
	        String regexDuration = "Duration: (.*?), start: (.*?), bitrate: (\\d*) kb\\/s";
	        Pattern pattern = Pattern.compile(regexDuration);
	        Matcher m = pattern.matcher(sb.toString());
	        if (m.find()) {
	        	int time = getTimelen(m.group(1));
	        	log.info(video_path+",视频时长:"+time+", 开始时间:"+m.group(2)+",比特率:"+m.group(3)+"kb/s");
	        	return time;
	        }
		} catch (Exception e) {
			e.printStackTrace();
		}
		
		return 0;
	}
	
	//格式:"00:00:10.68"
    private static int getTimelen(String timelen){
        int min=0;
        String strs[] = timelen.split(":");
        if (strs[0].compareTo("0") > 0) {
            min+=Integer.valueOf(strs[0])*60*60;//秒
        }
        if(strs[1].compareTo("0")>0){
            min+=Integer.valueOf(strs[1])*60;
        }
        if(strs[2].compareTo("0")>0){
            min+=Math.round(Float.valueOf(strs[2]));
        }
        return min;
    }

 

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