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I had the same error with Indigo and the usb_cam driver when using an inexpensive Chinese webcam. The webcam worked fine with other applications, but not with the launch file from ROS by example volume 1 for the Vision examples. What I found in my case was that the pixel_format had to change from mjpeg in the original launch file to yuyv.

After I made that change the webcam is working fine.

Note that I had MSoft LifeCam 3000 that I was also testing with and that camera worked OK with the pixel_format set to mjpeg.

Hope this helps someone in the future.