Why do I get a time out while getting a from a USB webcam?

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Bharath Lohray
Bharath Lohray 2015-10-4
回答： Enoch 2016-9-18
How do I fix this problem. I webcam works fine on skype and I had all my chat apps off too. Preview gets me a window with a black image.
>> cam= webcam(1);
>> cam
cam =
webcam with properties:
Name: 'Logitech HD Pro Webcam C920'
Resolution: '640x480'
AvailableResolutions: {1x17 cell}
WhiteBalance: 4000
Saturation: 128
Exposure: -4
Zoom: 100
Gain: 0
Focus: 0
Brightness: 100
Tilt: 0
Contrast: 128
Sharpness: 128
Pan: 0
ExposureMode: 'auto'
BacklightCompensation: 0
>> img = snapshot(cam);
Error using matlab.webcam.internal.WebcamController/getCurrentFrame
Time out occured while trying to get a frame from the webcam.
Error in webcam/snapshot (line 227)
[image, timestamp] = obj.CamController.getCurrentFrame();
I am using 2015b on Windows 10. I have skype and google hangouts installed. I have 2 webcams - the notebook inbuilt webcam and a C920 Logitech external camera.
The video chat app test shows the preview fine. I made sure that these apps were closed while trying to capture images.
The issue occurs with both cameras. Also, the problem persisted even after a reboot.
  1 个评论
Bharath Lohray
Bharath Lohray 2015-10-6
The problem mysteriously vanished. I attached the webcam to my computer instead of the self powered USB3 hub. It worked. Then attached it back to the hub. It still worked.
Undetirministic Machine!

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回答（2 个）

Madhura Suresh
Madhura Suresh 2015-10-5
Hi Bharath,
What version of MATLAB are you using and what OS are you on? Can you also confirm that other apps that might be using the webcam(like Skype/ Logitech software) are closed before you run this in MATLAB?
  1 个评论
Bharath Lohray
Bharath Lohray 2015-10-5
I am using 2015b on Windows 10. I have skype and google hangouts installed. I have 2 webcams - the notebook inbuilt webcam and a C920 Logitech external camera.
The video chat app test shows the preview fine. I made sure that these apps were closed while trying to capture images.
The issue occurs with both cameras. Also, the problem persisted even after a reboot.

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Enoch
Enoch 2016-9-18
I do it by running matlab as administrator

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