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Section 2 on the gscam wiki page describes how to the set the GSCAM_CONFIG environment variable; that should fix the second error you encountered.

You'll also want to make sure that you're using the correct video device, something like /dev/video0 or /dev/video1, and that your user has read and write permissions on it.

I'm not sure why their v4l launch file doesn't work; it isn't documented on the wiki.

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