ffmpeg 获得视频的时间长度, 仅仅学习一下

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;
}
}