What is the problem?
The camera I'm using is showing bad picture.
What did you already try to solve it?
Tried to add -r HD -f 30 to the conf file but didn't get better
Additional information about your setup (OctoPrint version, OctoPi version, printer, firmware, octoprint.log, serial.log or output on terminal tab, ...)
Try adding a couple of thse. You'll need to reload or reboot when you change the settings. When I say "or", try one, then try the next, with a reload in between. Don't change everything at once or you won't know what you did wrong. We aren't looking for the best, we're looking for what causes changes that make it actually show up.
-ev 1 or -ev 0 -br 20 or -br 50 or -br 90
So, as you can see, there are 5 options you should try, one by one.