java获取视频播放时长

1、安装工具：ffmpeg，安装步骤略

2、代码

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.List;

import org.apache.oro.text.regex.MalformedPatternException;
import org.apache.oro.text.regex.MatchResult;
import org.apache.oro.text.regex.Pattern;
import org.apache.oro.text.regex.PatternCompiler;
import org.apache.oro.text.regex.PatternMatcher;
import org.apache.oro.text.regex.Perl5Compiler;
import org.apache.oro.text.regex.Perl5Matcher;

public class VideoUtil {

/**
 * 保存视频缩略图
 * @throws IOException 
 */
public static void saveVideoThumbnail(String videoPath, String imagePath) throws IOException {
//ffmpeg -i xxx.mp4 -y -f image2 -t 0.001 -s 125x125 xxx.jpg
List<String> cmd = new java.util.ArrayList<String>();
cmd.add("ffmpeg");// 视频提取工具的位置
cmd.add("-i");
cmd.add(videoPath);
cmd.add("-y");
cmd.add("-f");
cmd.add("image2");
cmd.add("-t");
cmd.add("0.001");
cmd.add("-s");
cmd.add("125x125");
cmd.add(imagePath);
ProcessBuilder builder = new ProcessBuilder();
builder.command(cmd);
builder.start();
}


public static void main(String[] args) {

String result = processFLV("20150722190602BmEf1C9Z.mp4");

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) {
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
// 保存ffmpeg的输出结果流
BufferedReader buf = null; 
String line = null;
// read the standard output

buf = new BufferedReader(new InputStreamReader(p.getInputStream()));
StringBuffer sb = new StringBuffer();
while ((line = buf.readLine()) != null) {
sb.append(line);
continue;
}

// 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
@SuppressWarnings("unused")
int ret = p.waitFor();
// 1. end
return sb.toString();
} catch (Exception e) {
return null;
}
}



}

3、使用到的jar包

http://www.java2s.com/Code/Jar/a/Downloadapachejakartacommonscodecjar.htm