For some reason I can't access my webcam on the Raspberry Pi

After a few problems with the api, which i solved successfully, now i really dont know how to fix this: If i execute my code without the webcam plugged in everything is working as expected. But with my webcam plugged in i got the following exception:

My code:

import com.github.sarxos.webcam.Webcam;
import com.github.sarxos.webcam.ds.v4l4j.V4l4jDriver;

public class DetectWebcamExample {
	static {
	     Webcam.setDriver(new V4l4jDriver()); // this is important
	}
	public static void main(String[] args) {
		Webcam webcam = Webcam.getDefault();
		if (webcam != null) {
			System.out.println("Webcam: " + webcam.getName());
		} else {
			System.out.println("No webcam detected");
		}
	}
}

The output with webcam:

Exception in thread "main" com.github.sarxos.webcam.WebcamException: java.util.concurrent.ExecutionException: java.lang.UnsatisfiedLinkError: au.edu.jcu.v4l4j.VideoDevice.doInit(Ljava/lang/String;)J
	at com.github.sarxos.webcam.WebcamDiscoveryService.getWebcams(WebcamDiscoveryService.java:124)
	at com.github.sarxos.webcam.Webcam.getWebcams(Webcam.java:816)
	at com.github.sarxos.webcam.Webcam.getDefault(Webcam.java:879)
	at com.github.sarxos.webcam.Webcam.getDefault(Webcam.java:856)
	at com.github.sarxos.webcam.Webcam.getDefault(Webcam.java:834)
	at DetectWebcamExample.main(DetectWebcamExample.java:14)
Caused by: java.util.concurrent.ExecutionException: java.lang.UnsatisfiedLinkError: au.edu.jcu.v4l4j.VideoDevice.doInit(Ljava/lang/String;)J
	at java.base/java.util.concurrent.FutureTask.report(FutureTask.java:122)
	at java.base/java.util.concurrent.FutureTask.get(FutureTask.java:191)
	at com.github.sarxos.webcam.WebcamDiscoveryService.getWebcams(WebcamDiscoveryService.java:116)
	... 5 more
Caused by: java.lang.UnsatisfiedLinkError: au.edu.jcu.v4l4j.VideoDevice.doInit(Ljava/lang/String;)J
	at au.edu.jcu.v4l4j.VideoDevice.doInit(Native Method)
	at au.edu.jcu.v4l4j.VideoDevice.<init>(VideoDevice.java:271)
	at com.github.sarxos.webcam.ds.v4l4j.V4l4jDevice.<init>(V4l4jDevice.java:66)
	at com.github.sarxos.webcam.ds.v4l4j.V4l4jDriver.getDevices(V4l4jDriver.java:55)
	at com.github.sarxos.webcam.WebcamDiscoveryService$WebcamsDiscovery.call(WebcamDiscoveryService.java:36)
	at com.github.sarxos.webcam.WebcamDiscoveryService$WebcamsDiscovery.call(WebcamDiscoveryService.java:26)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
	at java.base/java.lang.Thread.run(Thread.java:844)


------------------
(program exited with code: 1)
Press return to continue

The Jars i used:

• slf4j-nop-1.6.1
• webcam-capture-driver-v4l4j-0.3.10-20140923.154112-11
• slf4j-api-1.7.2
• v4l4j-0.9.1-r507
• webcam-capture-0.3.10

My Hardware:

• Logitech C 170 (Im pretty sure its compatible)
• Raspberry Pi 3B with Raspbian 9 (stretch)

Thanks for helping

Edit: Yesterday I tried the webcam of an friend and it was the same problem. I just wanted to be sure.

[yuripourre]

I belive the FFMpeg drive has more chances to work because it doesn’t rely on JNI solutions, it may be less performant but since it uses Java Process it requires less configurations.

If you have issues, please, let me know.

[ysz0507]

@ysz0507 Would you mind trying the ffmpeg driver? It was reported to be working with Raspberry Pi.

@yuripourre Sry I’ve just read this jet. Yes for sure, but i‘m not really confident because the same thing was written a few times about the V4L4J-Driver. But we will see maybe it will work. 👌🏻 thx for helping