We’ve implemented a camera driver based on the l4t camera driver documentation. It works fine with v4l2-ctl --set-fmt-video=width=1920,height=1080,pixelformat=RG8 --stream-user --stream-count=100 -d /dev/video0. Accessing the images, we would like to use V4L_MEMORY_USERPTR. An ioctl for VIDIOC_REQBUFS with that parameter return without error. However, when trying to call VIDIOC_QBUF, an error code -22 is returned.
I’ve seen that there is an old post on this subject V4L2_MEMORY_USERPTR not working with soc camera . Has there been any update on this?
Due to --stream-user working well that tell the V4L_MEMORY_USERPTR working.
My apologies. The --stream-user above was pasted in error.--stream-mmap, but not with -sstream-user.
$ v4l2-ctl --stream-user --stream-count=100 -d /dev/video0
VIDIOC_QBUF: failed: Invalid argument
Hi,
You can try running
$ v4l2-ctl --stream-user --stream-count=100 -d /dev/video0 --verbose
and share the all dmesg information
$ dmesg
Regards
$ v4l2-ctl --stream-user --stream-count=100 -d /dev/video0 --verbose
VIDIOC_QUERYCAP: ok
VIDIOC_REQBUFS: ok
VIDIOC_QUERYBUF: ok
VIDIOC_QBUF: failed: Invalid argument
dmesg output is no different than with --stream-mmap.
You can use a GStreamer Pipeline to get more information:
gst-launch-1.0 v4l2src io-mode=userptr device=/dev/video0 ! videoconvert ! ximagesink --gst-debug=*v4l*:8
Note : This pipeline is just for debug purposes, it does not include NVIDIA hardware component.
Angel
I can repo by v4l2-ctl .
kayccc
April 30, 2020, 1:02am
#10
Hi jschwendner,
Please check the the latest version of v4l2-ctl, if further issue found, please open a new topic.
For the V4L2_MEMORY_USERPTR please have a reference to the sample code.
…/tegra_multimedia_api/samples/v4l2cuda/capture.cpp