File source = new File("视频.mp4");Encoder encoder = new Encoder();try {    MultimediaInfo info = encoder.getInfo(source);    System.out.println("dura="+info.getDuration());    Date date = new Date(info.getDuration());                SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss",Locale.getDefault());    sdf.setTimeZone(TimeZone.getTimeZone("GMT"));    System.out.println("时长="+sdf.format(date));} catch (Exception e) {            }

 引入jar包下载地址