Corrupt images

[fsphil]

Corrupt images

[fsphil]

Can you check dmesg while capturing an image. It sounds like the USB transfer is being interrupted.

It's also possible the first image the camera returns is corrupt, but subsequent ones OK. You can test this by trying --skip 10 (skips 10 frames before capturing).

[tZnew]

How can i check dmesg while capturing? My ssh client is blocked during the execution of the fswebcam command.

I made a bunch of tests with different resolutions and skips with the result being:
The higher the resolution, the bigger the green pixel areas
Skips have no impact really

But it is kind of randomly. Even most 300x200 pics are 50% green and completely 'puzzled'. I get one good pic with 380x240 (80 skips) and one good 160x120 with no skipped frames. Maybe not enough power?

[tZnew]

Swapped the webcam (which works fine at my desktop pc) with a playstation cam and this works - even at high resolution.

[fsphil]

Reading up on it most USB issues with the Raspberry Pi seem to be power problems. I can reset mine simply by plugging in a Wifi card. You might be able to work around this by using a powered USB hub.

I'm going to close this for now as I don't believe it is an issue with fswebcam.

[drng]

My 5 cents...

If powered USB hub does not help, ommiting -r option might help sometimes.

[slefter]

You should try to update your Raspberry Pi firmware.
sudo rpi-update
I had similar issues all the time with my older Logitech webcam on resolution 640x480 (only the 320x240 resolutione was working). After updating the RPi firmware (accidentally, I wanted just to have the raspicam accessed by v4l2 driver), it looks like this kind of issues have vanished; not even one bad image.

[GregPK]

Adding --skip 10 helped on my old Creative Labs vf0415 cam. Thx!