RPI camera don't work with zBar

[arthuro555]

Hi.
My camera doesn't work with zbar, but works fine with raspistill. The modprobe bcmsomething is activated. zbar can't find /dev/video0. What do I have to do?

[scotty101]

Does this old topic help?
viewtopic.php?t=68247
or this one
viewtopic.php?t=204954

[arthuro555]

The second link gave me the solution, but there is a new problem now: when I try to use zbar (zbarcam or in python), it says system error in zbar in v4l2_start(): starting video stream: operation not permitted. I also tried with sudo that gave the same error. pls help.

[arthuro555]

I realy need help, I work on a project and don't have much Tim, does anybody Know something that could help me?

[jamesh]

I've used raspistill in combination with zbar in a bash script.

Worked fine IIRC.

[arthuro555]

raspistill needs 5 seconds and it should be detected within 1 or 2 seconds
but thanks!

[jamesh]

raspistill capture time can be reduced to just under 1s. Should be good enough to do a detection in 2 seconds.

[arthuro555]

Aha. and how do i do that? I didnt saw anything like this in raspistill --help.

[jamesh]

Aha. and how do i do that? I didnt saw anything like this in raspistill --help.

raspistill -t 1000 -o fred.jpg

Takes the image after 1 second. (1000ms), You can reduce that number a bit until it stops working, usually about 600/700 before it fails.

https://www.raspberrypi.org/documentati ... /camera.md

[arthuro555]

I tried that but zbar needs 7 seconds every time. It's, again, a way too long.

[jamesh]

Try dropping the resolution of the capture. The smaller the image the faster zbar can read and process and you don't need a lot of resolution for qr codes.