Javax.media.NoPlayerException: Cannot find a Player for :v4l://0

Question

Hi,
I'm trying to grab a frame in a linux box with a webcam.
First i was having trouble in getting my webcam registered but thats history and now i can use jmfstudio to view thru the camera's eye.
But using the code below to get a frame i get the following exception:
Exception in thread "main" javax.media.NoPlayerException: Cannot find a Player for :v4l://0
at javax.media.Manager.createPlayerForContent(Manager.java:1412)
at javax.media.Manager.createPlayer(Manager.java:417)
at javax.media.Manager.createRealizedPlayer(Manager.java:553)
at FrameGrab.main(FrameGrab.java:26)
Code:
public class FrameGrab {
public static void main(String[] args) throws Exception {
Vector list = CaptureDeviceManager.getDeviceList ( null );
CaptureDeviceInfo devInfo = (CaptureDeviceInfo)list.elementAt ( 1 );
// Create capture device
CaptureDeviceInfo deviceInfo = CaptureDeviceManager.getDevice(devInfo.getName());
Player player = Manager.createRealizedPlayer(deviceInfo.getLocator());
player.start();
// Wait a few seconds for camera to initialise (otherwise img==null)
Thread.sleep(2500);
// Grab a frame from the capture device
FrameGrabbingControl frameGrabber = (FrameGrabbingControl)player.getControl("javax.media.control.FrameGrabbingControl");
Buffer buf = frameGrabber.grabFrame();
// Convert frame to an buffered image so it can be processed and saved
Image img = (new BufferToImage((VideoFormat)buf.getFormat()).createImage(buf));
BufferedImage buffImg = new BufferedImage(img.getWidth(null), img.getHeight(null), BufferedImage.TYPE_INT_RGB);
// Save image to disk as PNG
ImageIO.write(buffImg, "png", new File("webcam.png"));
// Stop using webcam
player.close();
player.deallocate();
System.exit(0);
Any tips?

Answer 1

hi
i've got the same problem too
the jms could only play .mp3 not other formats
is the installation wrong?
could some experts give me some advise?
my e-mail:[email protected]