用jmf如何过去取得avi文件的总的播放时长，不需要播放文件只要取得avi文件的时长就可以
我是这么写的但是不行呀，请高手指点，谢谢
player = Manager.createPlayer(new URL("file:c:\\36.avi"));
Time a =player.getDuration();
System.out.println("aaaa=" + a.getSeconds());
我是这么写的但是不行呀，请高手指点，谢谢
player = Manager.createPlayer(new URL("file:c:\\36.avi"));
Time a =player.getDuration();
System.out.println("aaaa=" + a.getSeconds());
package com.jmfsample2;import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Frame;
import java.awt.Panel;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;import javax.media.ControllerEvent;
import javax.media.ControllerListener;
import javax.media.EndOfMediaEvent;
import javax.media.Manager;
import javax.media.MediaLocator;
import javax.media.NoPlayerException;
import javax.media.Player;
import javax.media.PrefetchCompleteEvent;
import javax.media.RealizeCompleteEvent;
import javax.media.Time;public class JMFSample implements ControllerListener {
public static void main(String[] args) {
JMFSample sp = new JMFSample();
sp.play();
}
private Frame f;
private Player player;
private Panel panel;
private Component visual;
private Component control = null;
public void play(){
f = new Frame("JMF Sample1");
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent we) {
if(player != null) {
player.close();
}
System.exit(0);
}
});
f.setSize(500,400); f.setVisible(true);
URL url = null;
try {
//准备一个要播放的视频文件的URL
url = new URL("file:/E:/c-d.avi");
} catch (MalformedURLException e) {
e.printStackTrace();
}
try {
//通过调用Manager的createPlayer方法来创建一个Player的对象
//这个对象是媒体播放的核心控制对象
player = Manager.createPlayer(url);
} catch (NoPlayerException e1) {
e1.printStackTrace();
} catch (IOException e1) {
e1.printStackTrace();
} //对player对象注册监听器，能噶偶在相关事件发生的时候执行相关的动作
player.addControllerListener(this);
//让player对象进行相关的资源分配
player.realize();
}
private int videoWidth = 0;
private int videoHeight = 0;
private int controlHeight = 30;
private int insetWidth = 10;
private int insetHeight = 30;
//监听player的相关事件
public void controllerUpdate(ControllerEvent ce) {
if (ce instanceof RealizeCompleteEvent) {
//player实例化完成后进行player播放前预处理
player.prefetch();
} else if (ce instanceof PrefetchCompleteEvent) {
if (visual != null)
return; //取得player中的播放视频的组件，并得到视频窗口的大小
//然后把视频窗口的组件添加到Frame窗口中，
if ((visual = player.getVisualComponent()) != null) {
Dimension size = visual.getPreferredSize();
videoWidth = size.width;
videoHeight = size.height;
f.add(visual);
} else {
videoWidth = 320;
}
//取得player中的视频播放控制条组件，并把该组件添加到Frame窗口中
if ((control = player.getControlPanelComponent()) != null) {
controlHeight = control.getPreferredSize().height;
f.add(control, BorderLayout.SOUTH);
}
//设定Frame窗口的大小，使得满足视频文件的默认大小
f.setSize(videoWidth + insetWidth, videoHeight + controlHeight + insetHeight);
f.validate();
//启动视频播放组件开始播放
player.start();
} else if (ce instanceof EndOfMediaEvent) {
//当播放视频完成后，把时间进度条恢复到开始，并再次重新开始播放
player.setMediaTime(new Time(0));
player.start();
}
}}
DataSource source;
source = Manager.createDataSource(new URL("file:c:\\36.avi"));
Time a =source.getDuration();source.getContentType()都能取到video.x_msvideo
为什么source.getDuration();就取不到时长呢