On 5/20/19 1:38 PM, Gregor Jasny wrote: > Hello, > > On 20.05.19 10:25, folkert@xxxxxxxxxxxxxx wrote: >> Trying to get a pac207 camera to work with constatus. >> >> 2019-05-20 10:22:34.864900 INFO constatus [1-1] source v4l2 thread started >> libv4l2: error got 4 consecutive frame decode errors, last error: v4l-convert: error unknown pac207 row header: 0x0000 >> 2019-05-20 10:22:35.597949 ERROR cs:src_v4l2 [1-1] VIDIOC_DQBUF failed: Input/output error >> ioctl(VIDIOC_QBUF) failed >> errno: 22 (Invalid argument) >> >> To verify that it is not a constatus-problem I also tried a raspberry-pi camera via its video4linux-interface and that works fine. > > According to the Linux Kernel Maintainers file the device driver is > maintained by Hans, which I CC'ed on this bug report: > > GSPCA PAC207 SONIXB SUBDRIVER > M: Hans Verkuil <hverkuil@xxxxxxxxx> > L: linux-media@xxxxxxxxxxxxxxx > T: git git://linuxtv.org/media_tree.git > S: Odd Fixes > F: drivers/media/usb/gspca/pac207.c > > Did your camera ever work on another Kernel, CPU architecture, or > v4l-utils version? Do you have anything suspicious in dmesg output? I strongly recommend that you buy a new webcam. This is ancient hardware. Even the cheapest UVC webcams you can buy today will have far better quality than a pac207. If you really, really need this to work, then I need the full dmesg output and you also need to check if you can reproduce this issue with the v4l2-ctl command: v4l2-ctl -d /dev/videoX --stream-mmap (it keeps capturing frames until you press ctrl-X) I should have one of these webcams, but won't be able to test until next week. Regards, Hans
