August 5, 20251 yr Does this package exist? (sorry I am away from my armbian device) https://packages.debian.org/bookworm/v4l2loopback-dkms
August 5, 20251 yr Author sudo apt install v4l2loopback-dkms Czytanie list pakietów... Gotowe Budowanie drzewa zależnoÅ›ci... Gotowe Odczyt informacji o stanie... Gotowe   v4l2loopback-dkms is already the newest version (0.12.7-2). 0 aktualizowanych, 0 nowo instalowanych, 0 usuwanych i 8 nieaktualizowanych. root@orangepi3-lts:~# sudo modprobe v4l2loopback modprobe: FATAL: Module v4l2loopback not found in directory /lib/modules/6.12.35-current-sunxi64 Â
August 5, 20251 yr It is not an internal module so modprobe will not work. It appears to need to built separately: https://github.com/v4l2loopback/v4l2loopback You should be able to build this if you have the kernel headers that match, the just load it by using sudo insmod instead.
August 6, 20251 yr Author I can't build it from GitHub, or rather I've built it but it doesn't work because the kernel headers don't seem to match and it can't be loaded. I guess you have to compile the entire kernel with this module  🙂 ..uppss Quote modinfo /lib/modules/6.12.35-current-sunxi64/updates/v4l2loopback.ko | grep vermagic vermagic:    6.12.35-current-sunxi64 SMP mod_unload aarch64 modinfo /lib/modules/$(uname -r)/updates/v4l2loopback.ko filename:    /lib/modules/6.12.35-current-sunxi64/updates/v4l2loopback.ko alias:      char-major-10-255 license:     GPL version:     0.15.1 author:     Vasily Levin, IOhannes m zmoelnig <zmoelnig@iem.at>,Stefan Diewald,Anton Novikovet al. description:   V4L2 loopback video device srcversion:   45D4A1AED5D88ED1EEB4704 depends:     videodev name:      v4l2loopback vermagic:    6.12.35-current-sunxi64 SMP mod_unload aarch64 parm:      debug:debugging level (higher values == more verbose) (int) parm:      max_buffers:how many buffers should be allocated [DEFAULT: 2] (int) parm:      max_openers:how many users can open the loopback device [DEFAULT: 10] (int) parm:      devices:how many devices should be created (int) parm:      video_nr:video device numbers (-1=auto, 0=/dev/video0, etc.) (array of int) parm:      card_label:card labels for each device (array of charp) parm:      exclusive_caps:whether to announce OUTPUT/CAPTURE capabilities exclusively or not  [DEFAULT: 0] (array of bool) parm:      max_width:maximum allowed frame width [DEFAULT: 8192] (int) parm:      max_height:maximum allowed frame height [DEFAULT: 8192] (int) sudo modprobe v4l2loopback insmod /lib/modules/6.12.35-current-sunxi64/updates/v4l2loopback.ko insmod: ERROR: could not insert module /lib/modules/6.12.35-current-sunxi64/updates/v4l2loopback.ko: Invalid module format Edited August 6, 20251 yr by kris777
August 7, 20251 yr Uninstall the debian v4l2loopback package Did you add the build parameter to build for your specific kernel version? Did you do the final "make install" step?  https://github.com/v4l2loopback/v4l2loopback?tab=readme-ov-file#build-for-a-different-kernel  Search in the raspberry pi forum also
September 7, 20251 yr Author Solution OK...I think it worked in OrangePi3 LTS 🙂 ...first, clean up the remnants: ................................................................. sudo apt purge v4l2loopback-dkms sudo apt autoremove ............................................................... armbian-config then I had to switch to a different kernel: edge:6.15.4-edge-sunxi64 ....then update the system: apt update / upgrade / reboot ! install from GitHub: v4l2loopback and then: cd ~/v4l2loopback .................................................................... VERSION=$(grep -oP 'PACKAGE_VERSION="\K[^"]+' dkms.conf) sudo cp -r . /usr/src/v4l2loopback-$VERSION sudo dkms add -m v4l2loopback -v $VERSION sudo dkms build -m v4l2loopback -v $VERSION sudo dkms install -m v4l2loopback -v $VERSION dkms status sudo modprobe v4l2loopback ls /dev/video* ................................................................... I guess it's OK now: ................................................................ Quote ls /dev/video* /dev/video0 /dev/video1 /dev/video2 /dev/video3 /dev/video4 root@orangepi3-lts:~/v4l2loopback# lsmod Module Size Used by v4l2loopback 45056 0 uinput       16384 1 bnep         16384 2 hci_uart      106496 1 btqca 16384 1 hci_uart btrtl 20480  1 hci_uart btintel 36864 1 hci_uart btbcm 20480 1 hci_uart But in my opinion the module is not working properly 😞 I'll be more precise, it works OK... but OrangePi3LTS is a weak device and the option/module: v4l2loopback and the ffmpeg program that transmits/splits the image to two programs (motion/ustreamer) causes high CPU usage... but it works OK, so my problem is solved  Edited September 8, 20251 yr by kris777
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