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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.