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Im using OBS with v4l2sink and v4l2loopback to edit my video for a remote trainig. The preview in obs looks fine, but the video has some serious color shifts in any tool I try to display the v4l2loopack I'm directing the sink to.

View from OBS: View from OBS

View from Browser: View from Browser You can see that all colors have a green shadow about half the grid width. Is there any setting that I could change to fix this? The video format selected in the V4l2sinkProperties is YUV420 as all others result in "format not supported"

I run Ubuntu 20.04.1 LTS (Linux 5.4.0-42-generic x86_64). OBS Studio is 25.0.8 installed via apt. obs-v4l2sink and v4lsloopback are built and installed from the current GitHub sources.

hd42
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  • What OS/release, and how did you install OBS? (inc. version if a *snap* etc) – guiverc Sep 01 '20 at 08:04
  • I run Ubuntu 20.04.1 LTS (Linux 5.4.0-42-generic x86_64). OBS Studio is 25.0.8 installed via apt. obs-v4l2sink and v4lsloopback are built and installed from the current GitHub sources. – hd42 Sep 01 '20 at 08:12
  • Please add any important information directly to your question: use "edit". Comments may disappear, and may not be read by potential helpers. – vanadium Sep 01 '20 at 11:01
  • Hi, im having the same problem but from the obs-studio snap > snap info obs-studio To make use of the V4L2Sink plugin, install and configure `v4l2loopback` as follows: sudo apt -y install v4l2loopback-dkms v4l2loopback-utils echo "options v4l2loopback devices=1 video_nr=99 card_label=VirtualCam exclusive_caps=1" | sudo tee /etc/modprobe.d/v4l2loopback.conf echo "v4l2loopback" | sudo tee /etc/modules-load.d/v4l2loopback.conf sudo modprobe -r v4l2loopback sudo modprobe v4l2loopback devices=1 video_nr=99 card_label=VirtualCam exclusive_caps=1 – Francisco Ibáñez Sep 22 '20 at 12:11
  • After fiddling with the resolutions, I got it to work now. Apparently some combination of input and output resolutions did not work well. – hd42 Sep 23 '20 at 14:48
  • where and how you change the resolution? – Francisco Ibáñez Sep 23 '20 at 17:11
  • For the camera: v4l2-ctl -d /dev/video2 --set-fmt-video=width=1920,height=1080. The rest: in OBS – hd42 Sep 28 '20 at 06:16
  • I fixed it by changing video format to YUY2 – Pegasis Nov 16 '20 at 14:53

1 Answers1

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You need to set the format to YUY2 and set the same dimensions on OBS and v4l2 device.

I solve my issue of "not supported format" by:

  1. removing v4l2loopback-utils and then installing v4l2loopback-dkms
  2. set YUY2 on v4l2sink menu

The credits are for https://github.com/CatxFish/obs-v4l2sink/issues/5#issuecomment-618336414

Marcelo Lara
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