Caused by: java.lang.NullPointerException at org.bytedeco.javacv.FrameGrabber.create(FrameGrabber.java:94)

[ankurb0308]

Hi All,

I am new to this thing and got stuck please have a look below code and Error along with the console output and advice what I am missing. any help or clue would be highly appreciated.

Code :

import javax.swing.JFrame;

import com.github.sarxos.webcam.Webcam;
import com.github.sarxos.webcam.WebcamPanel;
import com.github.sarxos.webcam.ds.javacv.JavaCvDriver;
public class CameraCapture {

    static {
        Webcam.setDriver(new JavaCvDriver());
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("LTI-CIVIL Webcam Capture Driver Example");
        System.out.println("List webcam : "  + Webcam.getWebcams());
        Webcam availableWebcam = null;
        for(Webcam wc : Webcam.getWebcams()){
            if (wc.getName().equalsIgnoreCase("USB Video Device")) {
                availableWebcam = wc;
            }
        }

        frame.add(new WebcamPanel(availableWebcam));
        frame.pack();
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}

---

Error & Console output :

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
List webcam : [Webcam USB Video Device]
Exception in thread "main" com.github.sarxos.webcam.WebcamException: Cannot execute task
    at com.github.sarxos.webcam.WebcamProcessor$AtomicProcessor.process(WebcamProcessor.java:62)
    at com.github.sarxos.webcam.WebcamProcessor.process(WebcamProcessor.java:130)
    at com.github.sarxos.webcam.WebcamTask.process(WebcamTask.java:38)
    at com.github.sarxos.webcam.ds.cgt.WebcamOpenTask.open(WebcamOpenTask.java:20)
    at com.github.sarxos.webcam.Webcam.open(Webcam.java:272)
    at com.psi.test.camera.CameraCapture.main(CameraCapture.java:27)
Caused by: java.lang.NullPointerException
    at org.bytedeco.javacv.FrameGrabber.create(FrameGrabber.java:94)
    at org.bytedeco.javacv.FrameGrabber.createDefault(FrameGrabber.java:117)
    at com.github.sarxos.webcam.ds.javacv.JavaCvDevice.buildGrabber(JavaCvDevice.java:91)
    at com.github.sarxos.webcam.ds.javacv.JavaCvDevice.open(JavaCvDevice.java:113)
    at com.github.sarxos.webcam.ds.cgt.WebcamOpenTask.handle(WebcamOpenTask.java:38)
    at com.github.sarxos.webcam.WebcamProcessor$AtomicProcessor.run(WebcamProcessor.java:71)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

VIDEOINPUT SPY MODE!

SETUP: Looking For Capture Devices
SETUP: 0) USB Video Device 
SETUP: 1 Device(s) found

[rakeshbhatt10]

Hi ankurb0308,

I have created another issue with same driver you are trying to do. I got unsatisfied link error while javacv and opencv configured correctly and samples of javacv working perfectly. Can you tell me how you resolved unsatisfied link error.

Thanks, Rakesh

[karldonitz]

You need slf4j-nop.jar