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 cmd = new java.util.ArrayList();
		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 commend = new java.util.ArrayList();
		// 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