v4l2


A4Tech webcam and avconv (ffmpeg) captures same frame all the time


I got problem with capturing webcam image on Debian (Raspbian) with ffmpeg (avconv) ... seems that it's always the same image, that changes only when I click the photo button on camera... any idea how to fix it?
The way I try it is:
avconv -f video4linux2 -i /dev/video0 -r 5 test_%04d.png
v4l2-ctl --list-devices
returns:
FULL HD 5MP Webcam (usb-3f980000.usb-1.3):
/dev/video0

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