Questions[obs-studio](ubuntu)

I'm using OBS Studio and would like to have a virtual video output saved permanently so that it can be run when the application is launched.

This command creates the virtual output:

sudo modprobe v4l2loopback video_nr=10 card_label="OBS Video Source" exclusive_caps=1

But I must run the command in console on each boot. How can I make this permanent? The plugin that utilizes the output in OBS Studio is configured to auto start but /dev/video10 is not available after a reboot of the system.

$ modinfo v4l2loopback | grep -i parm
parm:           debug:debugging level (higher values == more verbose) (int)
parm:           max_buffers:how many buffers should be allocated (int)
parm:           max_openers:how many users can open loopback device (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 every device (array of charp)
parm:           exclusive_caps:whether to announce OUTPUT/CAPTURE capabilities exclusively or not (array of bool)
parm:           max_width:maximum frame width (int)
parm:           max_height:maximum frame height (int)

I just installed Kubuntu 20.04 and OBS,but NVENC doesn't seem to work for some reason even though I have nvidia-driver-390 installed and configured via System Settings.

Settings:

Error on Start Recording:

System Settings:

How can I restore OBS's hardware NVENC support?

Hardware Specs:

sarah@LesserArk:~$ inxi -Fx
System:    Host: LesserArk Kernel: 5.4.0-31-generic x86_64 bits: 64 compiler: gcc v: 9.3.0 Desktop: KDE Plasma 5.18.5 
           Distro: Ubuntu 20.04 LTS (Focal Fossa) 
Machine:   Type: Laptop System: Hewlett-Packard product: HP ENVY 17 Notebook PC v: 097E110000405E00000620100 
           serial: <superuser/root required> 
           Mobo: Hewlett-Packard model: 1968 v: KBC Version 93.52 serial: <superuser/root required> UEFI: Insyde v: F.70 
           date: 10/20/2017 
Battery:   ID-1: BAT0 charge: 41.2 Wh condition: 41.2/41.2 Wh (100%) model: Hewlett-Packard Primary status: Full 
CPU:       Topology: Quad Core model: Intel Core i7-4702MQ bits: 64 type: MT MCP arch: Haswell rev: 3 L2 cache: 6144 KiB 
           flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 35120 
           Speed: 2050 MHz min/max: 800/3200 MHz Core speeds (MHz): 1: 2050 2: 2152 3: 2027 4: 2090 5: 2067 6: 2128 7: 1956 
           8: 2096 
Graphics:  Device-1: Intel 4th Gen Core Processor Integrated Graphics vendor: Hewlett-Packard driver: i915 v: kernel 
           bus ID: 00:02.0 
           Device-2: NVIDIA GK107M [GeForce GT 750M] vendor: Hewlett-Packard driver: nvidia v: 390.132 bus ID: 01:00.0 
           Display: x11 server: X.Org 1.20.8 driver: modesetting,nvidia unloaded: fbdev,nouveau,vesa 
           resolution: 1920x1080~60Hz, 1920x1080~75Hz 
           OpenGL: renderer: GeForce GT 750M/PCIe/SSE2 v: 4.6.0 NVIDIA 390.132 direct render: Yes 
Audio:     Device-1: Intel Xeon E3-1200 v3/4th Gen Core Processor HD Audio vendor: Hewlett-Packard driver: snd_hda_intel 
           v: kernel bus ID: 00:03.0 
           Device-2: Intel 8 Series/C220 Series High Definition Audio vendor: Hewlett-Packard driver: snd_hda_intel v: kernel 
           bus ID: 00:1b.0 
           Sound Server: ALSA v: k5.4.0-31-generic 
Network:   Device-1: Intel Wireless 7260 driver: iwlwifi v: kernel port: 5000 bus ID: 07:00.0 
           IF: wlp7s0 state: up mac: e4:70:b8:f8:99:b8 
           Device-2: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet vendor: Hewlett-Packard driver: r8169 v: kernel 
           port: 3000 bus ID: 0f:00.0 
           IF: eno1 state: up speed: 1000 Mbps duplex: full mac: a0:1d:48:fa:67:c0 
           IF-ID-1: tun0 state: unknown speed: 10 Mbps duplex: full mac: N/A 
Drives:    Local Storage: total: 3.21 TiB used: 1.18 TiB (36.8%) 
           ID-1: /dev/sda vendor: Toshiba model: MQ01ABD100 size: 931.51 GiB 
           ID-2: /dev/sdb vendor: LITE-ON IT model: LMS-24L6M-HP size: 22.37 GiB 
           ID-3: /dev/sdc vendor: Seagate model: ST2000LM015-2E8174 size: 1.82 TiB 
           ID-4: /dev/sdd vendor: Samsung model: SSD 860 EVO 500GB size: 465.76 GiB 
           ID-5: /dev/sde type: USB vendor: SanDisk model: U3 Cruzer Micro size: 1.91 GiB 
           ID-6: /dev/sdf type: USB vendor: SanDisk model: Gaming Xbox 360 size: 7.48 GiB 
RAID:      Hardware-1: Intel 82801 Mobile SATA Controller [RAID mode] driver: ahci v: 3.0 bus ID: 00:1f.2 
Partition: ID-1: / size: 398.61 GiB used: 208.93 GiB (52.4%) fs: btrfs dev: /dev/sdd2 
           ID-2: /home size: 398.61 GiB used: 208.93 GiB (52.4%) fs: btrfs dev: /dev/sdd2 
           ID-3: swap-1 size: 14.90 GiB used: 0 KiB (0.0%) fs: swap dev: /dev/sdd3 
Sensors:   System Temperatures: cpu: 63.0 C mobo: 60.0 C gpu: nvidia temp: 55 C 
           Fan Speeds (RPM): N/A 
Info:      Processes: 466 Uptime: 1h 34m Memory: 15.57 GiB used: 7.12 GiB (45.7%) Init: systemd runlevel: 5 Compilers: 
           gcc: 9.3.0 Shell: bash v: 5.0.16 inxi: 3.0.38 

Using Kazam or OBS to record my screen always results in a blank screen. Google searches do not show results for 19.04, only past versions. Any help?

I tried to make a recording for gameplay of youtube and twitch but via obs but I found something very inconvenient. The colors are all inverted ... (or fading, I have no idea) I would like a help from you if possible Ubuntu I'm using is the 18.10 obs is the 21.0.1

I installed OBS Studio:

sudo apt-get install obs-studio 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer required:
  gir1.2-keybinder-3.0 libkeybinder-3.0-0
Use 'sudo apt autoremove' to remove them.
The following additional packages will be installed:
  libfdk-aac0 libluajit-5.1-2 libluajit-5.1-common libxcb-xinerama0
The following NEW packages will be installed:
  libfdk-aac0 libluajit-5.1-2 libluajit-5.1-common libxcb-xinerama0 obs-studio
0 upgraded, 5 newly installed, 0 to remove and 0 not upgraded.
Need to get 3,678 kB of archives.
After this operation, 13.0 MB of additional disk space will be used.
Do you want to continue? [Y/n] 

I decided to remove it:

sudo apt-get --purge remove obs-studio Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer required:
  gir1.2-keybinder-3.0 libfdk-aac0 libkeybinder-3.0-0 libluajit-5.1-2
  libluajit-5.1-common libxcb-xinerama0
Use 'sudo apt autoremove' to remove them.
The following packages will be REMOVED:
  obs-studio*
0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
After this operation, 11.6 MB disk space will be freed.
Do you want to continue? [Y/n] 

When removing it, I expect 13.0 MB of disk space to be freed because that is what the installation required, but I got 11.6 MB disk space freed instead: Why?