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In cases like this I'd recommend trying out things with another method to access the camera. For instance, you can check if the image looks ok with guvcview. If it looks ok, there's some likelihood that you can make things work by using a different driver or modifying the one you've been using. If things don't work with an alternative solution either, it is likely that the camera might not conform to existing standards and making it work would be much harder (or impossible). Note that for most webcams there are multiple ROS drivers that you can try out, like usb_cam, gscam or libuvc_camera.