Hi, havin' no idea about resolution so I won't help there, but regarding 
exposure:
> with:
> 
> $ffmpeg7 -f v4l2 -i /dev/video0 -vframes 1 output.jpg
> 
> I get a very dark picture.
> 
> with:
> 
> ffmpeg7 -f v4l2 -i /dev/video0 -vframes 5  output_%02d.jpg
> 
> I get one or two dark exposures and then good exposed remaning  ones.
> 
Webcams operate only when something tries to access it. Cameras get ready fast 
but still that process is long enough to output first frames too dark.

You'll have to either make ffmpeg first trigger camera, wait a little bit and 
then start capturing or just ignore first (/two) frames and delete them
-- 
pl <p...@szwajn.net>

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