OBS fails to start virtual camera

N

nvidiabugreport

New Member
I have installed OBS studio on gentoo, and it fails to start virtual camera and displays an error message saying Starting output failed. Update video drivers

System using Nvidia proprietary drivers, and it's up-to-date.

Reference of relevant package-versions installed :
  • media-libs/libv4l-1.28.1
  • media-video/obs-studio-30.2.3
  • media-video/obs-vaapi-0.4.2
  • media-video/v4l2loopback-0.13.1
  • x11-drivers/nvidia-drivers-565.57.01-r3
Log file: obs_studio_gentoo.log

Situation: Only 1 screen with 1 video capture device using v4l interface.

Code: 
Graphics:
  Device-1: NVIDIA TU117M [GeForce GTX 1650 Mobile / Max-Q] vendor: Lenovo
    driver: nvidia v: 565.57.01 alternate: nvidia_drm non-free: 550.xx+
    status: current (as of 2024-09; EOL~2026-12-xx) arch: Turing code: TUxxx
    process: TSMC 12nm FF built: 2018-2022 pcie: gen: 1 speed: 2.5 GT/s
    lanes: 16 link-max: gen: 3 speed: 8 GT/s bus-ID: 01:00.0
    chip-ID: 10de:1f99 class-ID: 0300
  Device-2: Logitech Webcam C270 driver: snd-usb-audio,uvcvideo type: USB
    rev: 2.0 speed: 480 Mb/s lanes: 1 mode: 2.0 bus-ID: 1-10:32
    chip-ID: 046d:0825 class-ID: 0102 serial: <filter>
  Device-3: Chicony Integrated Camera driver: uvcvideo type: USB rev: 2.0
    speed: 480 Mb/s lanes: 1 mode: 2.0 bus-ID: 1-6:3 chip-ID: 04f2:b6c2
    class-ID: 0e02 serial: <filter>
  Display: server: X.org v: 1.21.1.14 driver: X: loaded: nvidia
    unloaded: modesetting alternate: fbdev,nouveau,nv,vesa gpu: nvidia
    display-ID: :0 screens: 1
  Screen-1: 0 s-res: 2560x1440 s-size: <missing: xdpyinfo>
  Monitor-1: DP-2 size-res: N/A modes: N/A
  Monitor-2: HDMI-0 pos: primary res: 2560x1440 hz: 144 dpi: 108
    size: 600x330mm (23.62x12.99") diag: 685mm (26.96") modes: N/A
  API: EGL v: 1.5 hw: drv: nvidia platforms: device: 0 drv: nvidia device: 2
    drv: swrast gbm: drv: kms_swrast surfaceless: drv: nvidia x11: drv: nvidia
    inactive: device-1
  API: OpenGL v: 4.6.0 compat-v: 4.5 vendor: nvidia mesa v: 565.57.01
    glx-v: 1.4 direct-render: yes renderer: NVIDIA GeForce GTX 1650/PCIe/SSE2
    memory: 3.91 GiB

Others features such as start/stop recording are functional and working fine.

Request support to solve the issue.
 
Tuna

Tuna

Member
You either need to have a proper polkit install so OBS can ask you for root password to load the loopback module or you have to load the module yourself.
 
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