Only one camera is created

[xav12358]

Hello,

I have installed v4l2loopback with on ubuntu sources. I have a ubuntu 16.04 desktop.

sudo modprobe v4l2loopback

Then I try to create virtual cameras:

sudo modprobe v4l2loopback video_nr=2,3,4

But only one camera is create which is /dev/video1 ( I already have my webcam on /dev/video0)

Here are more informations on install:

• v4l2loopback version: _____
  [ 232.789839] v4l2loopback driver version 0.9.1 loaded

• kernel version: _____
  Ubuntu 16.04
  Linux xavier-OMEN-by-HP-Laptop 4.15.0-47-generic Set correct output buffer type in vidioc_dqbuf #50~16.04.1-Ubuntu SMP Fri Mar 15 16:06:21 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

• Distribution (+version): _____
  No LSB modules are available.
  Distributor ID: Ubuntu
  Description: Ubuntu 16.04.3 LTS
  Release: 16.04
  Codename: xenial

I don't know why only one virtual camera is created.

[umlaeute]

the kernel won't load a module that is already loaded.
so you need to unload the module, before you can re-load it with different module parameters:

# rmmod v4l2loopback