Can't get or set format

[lucasw]

Can't get or set the v4l2_format without getting and invalid argument -22.

umlaeute/v4l2loopback#172

Ubuntu 18.04 has 0.10.0-1ubuntu1.1 installed, try latest in source, though many comments in that thread say it still doesn't work.

sudo rmmod v4l2loopback-dkms
sudo apt remove v4l2loopback-dkms

v4l2loopback$ sudo make install
[sudo] password for lucasw: 
make -C /lib/modules/`uname -r`/build M=/home/lucasw/catkin_ws/src/github/v4l2loopback modules_install
make[1]: Entering directory '/usr/src/linux-headers-5.0.0-31-generic'
  INSTALL /home/lucasw/catkin_ws/src/github/v4l2loopback/v4l2loopback.ko
At main.c:160:
- SSL error:02001002:system library:fopen:No such file or directory: ../crypto/bio/bss_file.c:72
- SSL error:2006D080:BIO routines:BIO_new_file:no such file: ../crypto/bio/bss_file.c:79
sign-file: certs/signing_key.pem: No such file or directory
  DEPMOD  5.0.0-31-generic
Warning: modules_install: missing 'System.map' file. Skipping depmod.
make[1]: Leaving directory '/usr/src/linux-headers-5.0.0-31-generic'

[lucasw]

Have to use the latest v4l2loopback and set the v4l2_format type to V4L2_BUF_TYPE_VIDEO_OUTPUT when querying it.