Here's the relevant output from the GRIP log file:
Code:
Jan 31, 2017 4:36:20 PM edu.wpi.grip.core.util.service.LoggingListener starting
INFO: [CameraSource] Starting
Jan 31, 2017 4:36:20 PM edu.wpi.grip.core.util.service.LoggingListener failed
SEVERE: [CameraSource] Failed from: RUNNING
edu.wpi.grip.core.sources.GrabberService$GrabberServiceException: [Webcam 0] Failed to grab image
at edu.wpi.grip.core.sources.GrabberService.runOneGrab(GrabberService.java:75)
at edu.wpi.grip.core.sources.GrabberService.run(GrabberService.java:64)
at com.google.common.util.concurrent.AbstractExecutionThreadService$1$2.run(AbstractExecutionThreadService.java:66)
at com.google.common.util.concurrent.Callables$4.run(Callables.java:122)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.bytedeco.javacv.FrameGrabber$Exception: videoInput.getPixels() Error: Could not get pixels.
at org.bytedeco.javacv.VideoInputFrameGrabber.grab(VideoInputFrameGrabber.java:171)
at edu.wpi.grip.core.sources.GrabberService.runOneGrab(GrabberService.java:73)
... 4 more