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我有一個攝像頭（實際上是3）和java程序來捕捉幀。但是，我還沒有找到設置FPS的方法。例如，當我使用新的VideoFormat設置FPS時，我可以看到它正確應用camFormat.intersects(newFormat)。但是，當我從相機中取出相框（通過BufferTransferHandler或通過手動取出）時，我獲得的幀數多於所選的FPS。JMF：設置攝像頭的FPS
如果新框架已經準備就緒，那麼是否有可能進行輪詢？
我發現了更多信息，所以我正在編輯它。 看來問題的根源在於Microsoft WDM Image Capture驅動程序。在VirtualDub捕捉模式下，我可以選擇每個單獨的網絡攝像頭，並選擇WDM。選擇WDM時，我會得到與JFM中的自定義格式對話框中相同的選項，並且它不會以全FPS捕獲。但是，CaptureDeviceManager.getDeviceList似乎只返回WDM驅動程序，而不是單個網絡攝像頭（和兩個話筒內的網絡攝像頭，但不是聲卡麥克風）。爲什麼是這樣？
這讓我很奇怪，我可以指定幀率，但是我找不到實際執行它的方法，即使在搜索互聯網並嘗試了不同的示例代碼後的幾天。我發現的每一個例子都只是以自己的速度請求幀，或者根本不在乎fps。
我的測試類：
運行，使用頂部的按鈕（重新）打開格式控制窗口（內部JMF），並嘗試改變FPS。這也是奇怪的是，除了非功能性的FPS領域，像分辨率場等領域也有非功能性（因爲它是由分辨率字段中覆蓋「自定義格式...」窗口。
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
import java.awt.image.BufferedImage;
import java.util.Vector;
import javax.media.Buffer;
import javax.media.CaptureDeviceInfo;
import javax.media.CaptureDeviceManager;
import javax.media.ControllerAdapter;
import javax.media.ControllerClosedEvent;
import javax.media.ControllerErrorEvent;
import javax.media.Manager;
import javax.media.MediaLocator;
import javax.media.Player;
import javax.media.RealizeCompleteEvent;
import javax.media.StartEvent;
import javax.media.StopEvent;
import javax.media.control.FormatControl;
import javax.media.control.FrameGrabbingControl;
import javax.media.format.FormatChangeEvent;
import javax.media.format.VideoFormat;
import javax.media.format.YUVFormat;
import javax.media.util.BufferToImage;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
public class CaptureTest extends JComponent implements ActionListener, WindowListener, Runnable
{
public static void main(String[] args)
{
Runnable r = new Runnable()
{
@Override
public void run()
{
new CaptureTest();
}
};
EventQueue.invokeLater(r);
}
Player player;
FrameGrabbingControl grabber;
FormatControl formatControl;
final JFrame frame;
public Image image;
public CaptureTest()
{
setLayout(new BorderLayout());
Vector<?> deviceVector = CaptureDeviceManager.getDeviceList(new YUVFormat());
final CaptureDeviceInfo[] deviceList = new CaptureDeviceInfo[deviceVector.size()];
for (int i = 0; i < deviceList.length; i++)
{
deviceList[i] = (CaptureDeviceInfo)deviceVector.get(i);
System.out.println("Capture Device found: " + deviceList[i].getName());
}
frame = new JFrame("Capture test");
frame.addWindowListener(this);
{
JButton b = new JButton("Format Control");
b.setEnabled(true);
b.addActionListener(this);
frame.add(b, BorderLayout.NORTH);
}
{
setPreferredSize(new Dimension(640, 480));
frame.add(this, BorderLayout.CENTER);
}
ControllerAdapter cl = new ControllerAdapter()
{
@Override
public void realizeComplete(RealizeCompleteEvent rce)
{
formatControl = (FormatControl)player.getControl("javax.media.control.FormatControl");
grabber = (FrameGrabbingControl)player.getControl("javax.media.control.FrameGrabbingControl");
Component co = formatControl.getControlComponent();
if (co != null)
{
player.stop();
JDialog d = new JDialog(frame, "Format Control", true);
d.add(co);
d.pack();
d.setLocationRelativeTo(frame);
d.setVisible(true);
d.dispose();
player.start();
}
System.out.println("realizeComplete: " + formatControl.getFormat());
}
@Override
public void formatChange(FormatChangeEvent fce)
{}
@Override
public void start(StartEvent se)
{}
@Override
public void stop(StopEvent se)
{}
@Override
public void controllerError(ControllerErrorEvent cee)
{
System.err.println(cee.getMessage());
System.err.println("Caused by: " + cee.getSource());
System.exit(0);
}
@Override
public void controllerClosed(ControllerClosedEvent cce)
{}
};
MediaLocator ml = deviceList[0].getLocator();
try
{
Manager.setHint(Manager.PLUGIN_PLAYER, Boolean.TRUE);
player = Manager.createPlayer(ml);
player.addControllerListener(cl);
player.start();
}
catch (Exception e)
{
e.printStackTrace();
JOptionPane.showMessageDialog(frame, "Could Not Create Player", "ERROR", JOptionPane.ERROR_MESSAGE);
}
frame.pack();
frame.setVisible(true);
new Thread(this).start();
}
public void grab()
{
if (grabber == null)
return;
Buffer buf = grabber.grabFrame();
// System.out.println(fps.getFPS() + "\t" + buf.getFormat());
BufferToImage b2i = new BufferToImage((VideoFormat)buf.getFormat());
BufferedImage bi = (BufferedImage)b2i.createImage(buf);
if (bi != null)
{
setImage(bi);
repaint();
}
}
public void setImage(Image im)
{
image = im;
Dimension size = new Dimension(im.getWidth(null), im.getHeight(null));
setPreferredSize(size);
setSize(size);
}
@Override
public void paintComponent(Graphics g)
{
if (image != null)
g.drawImage(image, 0, 0, this);
}
@Override
public void run()
{
while (true)
{
grab();
Thread.yield();
}
}
@Override
public void actionPerformed(ActionEvent e)
{
Component co = formatControl.getControlComponent();
if (co != null)
{
player.stop();
JDialog d = new JDialog(frame, "Format Control", true);
d.add(co);
d.pack();
d.setLocationRelativeTo(frame);
d.setVisible(true);
d.dispose();
player.start();
}
}
@Override
public void windowOpened(WindowEvent e)
{}
@Override
public void windowClosing(WindowEvent we)
{
if (player != null)
{
player.stop();
player.close();
}
System.exit(0);
}
@Override
public void windowClosed(WindowEvent e)
{}
@Override
public void windowIconified(WindowEvent e)
{}
@Override
public void windowDeiconified(WindowEvent e)
{}
@Override
public void windowActivated(WindowEvent e)
{}
@Override
public void windowDeactivated(WindowEvent e)
{}
}
你可能是對的。自2003年以來已更新/發佈，並且我無法在64位Linux（僅提供32位庫）上檢測到我的網絡攝像頭！ –