Problem：

如何通過Java獲取視訊的時長？

想通過Java來獲取某資料夾（或多個資料夾）下的視訊的總時長

經過查詢資料，發現可以通過JAVE實現：The JAVE (Java Audio Video Encoder) library is Java wrapper on the ffmpeg project。
JAVE下載地址

Solution：

以單個目錄下的視訊為例，通過JAVE實現，並採用不同的日期時間處理方式轉換為時-分-秒格式，順便熟悉了一下Java 中的日期處理。

• Note：當然，需要匯入下載的JAVE的jar檔案。。

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);
        }
    }

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

Your comments and suggestions are welcome!