I am able to stream with mmap but can’t able to do so with userptr.
v4l2-utils install by apt. version:1.18.0
v4l2-ctl -d /dev/video0 --stream-user
VIDIOC_QBUF returned -1 (Invalid argument)
https://forums.developer.nvidia.com/t/v4l2-capture-jitter-problem/147386/7
I tried the methods mentioned in the topic above.
Using the v4l-ctl -d /dev/video0 —stream-user is normal but use v4l-code VIDIOC_QBUF Still wrong.
If anyone can help me, I would be very grateful！
Try this if no problem you can reference to MMAPI sample code to implement the v4l APP to user USERPTR
v4l2-ctl-r36 (567.2 KB)