java调用ffmpeg获取视频时长

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public static void main(String[] args) {    String result =    processFLV("E:\\test\\京视传媒\\体育类\\xiao.flv");          PatternCompiler compiler =new Perl5Compiler();    try {        String regexDuration ="Duration: (.*?), start: (.*?), bitrate: (\\d*) kb\\/s";        String regexVideo ="Video: (.*?), (.*?), (.*?)[,\\s]";        String regexAudio ="Audio: (\\w*), (\\d*) Hz";           Pattern patternDuration = compiler.compile(regexDuration,Perl5Compiler.CASE_INSENSITIVE_MASK);        PatternMatcher matcherDuration = new Perl5Matcher();        if(matcherDuration.contains(result, patternDuration)){            MatchResult re = matcherDuration.getMatch();            System.out.println("提取出播放时间  ===" +re.group(1));            System.out.println("开始时间        =====" +re.group(2));            System.out.println("bitrate 码率 单位 kb==" +re.group(3));        }               Pattern patternVideo = compiler.compile(regexVideo,Perl5Compiler.CASE_INSENSITIVE_MASK);        PatternMatcher matcherVideo = new Perl5Matcher();               if(matcherVideo.contains(result, patternVideo)){            MatchResult re = matcherVideo.getMatch();            System.out.println("编码格式  ===" +re.group(1));            System.out.println("视频格式 ===" +re.group(2));            System.out.println(" 分辨率  == =" +re.group(3));        }               Pattern patternAudio = compiler.compile(regexAudio,Perl5Compiler.CASE_INSENSITIVE_MASK);        PatternMatcher matcherAudio = new Perl5Matcher();               if(matcherAudio.contains(result, patternAudio)){            MatchResult re = matcherAudio.getMatch();            System.out.println("音频编码             ===" +re.group(1));            System.out.println("音频采样频率  ===" +re.group(2));        }    } catch (MalformedPatternException e) {        e.printStackTrace();    }    }   //  ffmpeg能解析的格式：（asx，asf，mpg，wmv，3gp，mp4，mov，avi，flv等）    private static String processFLV(String inputPath) {/*      if (!checkfile(inputPath)){          _log.warn(inputPath+" is not file");          return false;         }*/        List<String> commend=new java.util.ArrayList<String>();       //        commend.add("e:\\videoconver\\ffmpeg\\ffmpeg ");//可以设置环境变量从而省去这行       commend.add("ffmpeg");        commend.add("-i");        commend.add(inputPath);              try {            ProcessBuilder builder = new ProcessBuilder();            builder.command(commend);            builder.redirectErrorStream(true);            Process p= builder.start();           //1. start            BufferedReader buf = null; // 保存ffmpeg的输出结果流            String line = null;          //read the standard output            buf = new BufferedReader(new InputStreamReader(p.getInputStream()));                       StringBuffer sb= new StringBuffer();            while ((line = buf.readLine()) != null) {             System.out.println(line);             sb.append(line);             continue;                 }            int ret = p.waitFor();//这里线程阻塞，将等待外部转换进程运行成功运行结束后，才往下执行            //1. end            return sb.toString();        } catch (Exception e) {//            System.out.println(e);            return null;        }    }
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