java读取视频文件在网页显示 java获取视频文件时长

Problem：

如何通过Java获取视频的时长？

想通过Java来获取某文件夹（或多个文件夹）下的视频的总时长

经过查询资料，发现可以通过JAVE实现：The JAVE (Java Audio Video Encoder) library is Java wrapper on the ffmpeg project。
JAVE下载地址

Solution：

以单个目录下的视频为例，通过JAVE实现，并采用不同的日期时间处理方式转换为时-分-秒格式，顺便熟悉了一下Java 中的日期处理。

• Note：当然，需要导入下载的JAVE的jar文件。。

eg：

import java.io.File;
    import java.text.SimpleDateFormat;
    import java.util.Calendar;
    import java.util.Date;
    import java.util.TimeZone;

    import it.sauronsoftware.jave.Encoder;
    import it.sauronsoftware.jave.EncoderException;
    import it.sauronsoftware.jave.MultimediaInfo;

    public class VideoDuration {

        public void getVideoDuration(String path) {
            // get all files in specified "path"
            File[] files = new File(path).listFiles();

            Encoder encoder = new Encoder();
            MultimediaInfo multimediaInfo;

            long totalTime = 0L;
            long duration = 0L;

            for (int i = 0; i < files.length; i++) {
                // here, the format of video can be changed, JAVE upports dozens of formats
                if (!files[i].isDirectory() && files[i].toString().endsWith(".avi")) {
                    try {
                        multimediaInfo = encoder.getInfo(files[i]);
                        duration = multimediaInfo.getDuration();
                        totalTime += duration;
                    } catch (EncoderException e) {
                        e.printStackTrace();
                    }
                }
            }

            // long --> hh:mm: calculate the time manually
            System.out.print(totalTime/(3600*1000) + ":" + totalTime%(3600*1000)/(60*1000) + ":" + totalTime%(3600*1000)%(60*1000)/1000);
            System.out.println("==>Manually");

            // set a default TimeZone before using Date, Calendar and SimpleDateFormat  
            TimeZone.setDefault(TimeZone.getTimeZone("GMT+00:00")); // January 1, 1970, 00:00:00 GMT(can be found in Date.class)

            // long --> hh:mm:ss by means of java.util.Date
            Date date = new Date(totalTime);        
            System.out.print(date.getHours() + ":" + date.getMinutes() + ":" + date.getSeconds());
            System.out.println("==>By Date");

            // long --> hh:mm:ss by means of java.util.Calendar, Date
            Calendar calendar = Calendar.getInstance();
            calendar.setTime(date);
            System.out.print(calendar.get(Calendar.HOUR_OF_DAY) + ":" + calendar.get(Calendar.MINUTE) + ":" + calendar.get(Calendar.SECOND));
            System.out.println("==>By Calendar");

            // long --> hh:mm:ss by means of java.text.SimpleDateFormat, java.util.Date
            SimpleDateFormat simpleDateFormat = new SimpleDateFormat("HH:mm:ss");
            System.out.print(simpleDateFormat.format(date));
            System.out.println("==>By SimpleDateFormat");
        }
        public static void main(String[] args) {
            String filePath = "E:\\BaiduYunDownload\\MySQL";

            VideoDuration videoDuration = new VideoDuration();      
            videoDuration.getVideoDuration(filePath);
        }
    }

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If you have any questions or any bugs are found, please feel free to contact me.

Your comments and suggestions are welcome!