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Thank you or your answer. Could you please provide a bit more details? What you mean 'go into debug'? Are there any opencv logs or smting like that?

I'm using logitech c270 cam with opencv 3.0.

The aim is to capture a frame and save it as jpg. It works great, but i can't change frame width/height. It's always 640x480 (tried bigger and smaller sizes). Function VideoCapture.set(CAP_PROP_FRAME_WIDTH, val) always returns false.

Some steps:

1. Changed the resolution with v4l2-ctl --set-fmt-video, but after launching my program, all settings are gone back to 640x480.
2. Test the same thing via fswebcam --save -r 1280x960 and finally got image with needed sizes
3. Checked v4l2-ctl --get-fmt-video. There are correct values

It looks like opencv always sets default resolution and not provides opportunity to change it.