Video Capture Device (v4l2) plugin

JohnDee

New Member
Thanks! Can you confirm you're running OBS version > 26? I just did a new install on Ubuntu snap 20.10, v4l2loopback-dkms, on a different machine and I can't find it. If you're running version 26, that would give me a lot of info.
 

frisco

New Member
Thanks! Can you confirm you're running OBS version > 26? I just did a new install on Ubuntu snap 20.10, v4l2loopback-dkms, on a different machine and I can't find it. If you're running version 26, that would give me a lot of info.

I'm running 26.1.0 on arch linux. That's just the default obs-studio package. I'm using obs-v4l2sink from git commit 36d5bdb, compiled against obs 26.1.0.
 

Quick

New Member
Hi.

I am super new to Ubuntu. I run a YouTube channel and I can't use my regular things I use for making videos. OBS seems to be the best option along with Shortcut which I plan to use.

I have no idea how to use this stuff. I have been searching all over and can't find a fix. My problem isn't that I can't select V4L2 but that I have no picture at all even when I have it selected. I tried recording, but I still get no picture and don't know where to find my video recordings so I can't check with another program to see if my recording works or not. I think my audio works fine, but it's a little low. So if someone knows how I can actually view what I am recording and also how to turn my mic up that would be awesome.

My webcam is: PC Webcam for Streaming HD 1080P, Vitade 960A USB Pro Computer Web Camera Video Cam for Mac Windows Laptop Conferencing Gaming with Microphone & Ring Light
My mic is: USB Microphone Kit 192KHZ/24BIT MAONO AU-A04T PC Condenser Podcast Streaming Cardioid Mic Plug & Play for Computer, YouTube, Gaming Recording

Thanks to anyone willing to help a complete newb out.
 

Quick

New Member
Hi.

I am super new to Ubuntu. I run a YouTube channel and I can't use my regular things I use for making videos. OBS seems to be the best option along with Shortcut which I plan to use.

I have no idea how to use this stuff. I have been searching all over and can't find a fix. My problem isn't that I can't select V4L2 but that I have no picture at all even when I have it selected. I tried recording, but I still get no picture and don't know where to find my video recordings so I can't check with another program to see if my recording works or not. I think my audio works fine, but it's a little low. So if someone knows how I can actually view what I am recording and also how to turn my mic up that would be awesome.

My webcam is: PC Webcam for Streaming HD 1080P, Vitade 960A USB Pro Computer Web Camera Video Cam for Mac Windows Laptop Conferencing Gaming with Microphone & Ring Light
My mic is: USB Microphone Kit 192KHZ/24BIT MAONO AU-A04T PC Condenser Podcast Streaming Cardioid Mic Plug & Play for Computer, YouTube, Gaming Recording

Thanks to anyone willing to help a complete newb out.
UPDATE: I was able to see my webcam works with cheese but I still can't see anything in OBS Studio
UPDATE: I found out there was more installing to do before it can work. I ran this "sudo apt install v4l-utils v4l2loopback-dkms v4l2loopback-utils"
But now I have to run this "v4l2loopback-utils" but it say "v4l2loopback-utils: command not found"
UPDATE: I was trying to follow the directions here: https://github.com/CatxFish/obs-v4l2sink/issues/54

I got to this step: sudo apt-get install libobs-dev
And I got this message: "E: Unable to correct problems, you have held broken packages."

UPDATE: I ran this command: "sudo dpkg - obs-4l2sink.deb"
And got this message: "dpkg: error: need an action option"

What should I do?
 

Quick

New Member
Update: I now have 2 different plugin options under Tools for v4l2sink; one is just below the other. How do I fix this?
 

actuday

New Member
Hello!
I saw on the v4l2 GitHub that the plugin now ships with OBS. My version is 26.1.2-1, but I don't have the v4l2 option under Tools. I've already installed the v4l2loopback package from pacman and enabled the kernel module with modprobe.
However, I do have an option called "Start Virtual Camera" on the bottom right of OBS, but it doesn't seem to do much and I can't find any settings for it either.
 

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Schmiddi1206

New Member
Hey guys, my english is very bad. I need help. I am a Streamer of a Mobile App and i dont can use the virtual CAM. Pls help me, my favorite league is German ;)
 

dsales

New Member
Hi

I have a problem with usb cameras which don't report the fps properly. The v4l2 plugin sees it as NaN, so it defines a negative timeout, which creates huge amounts of error logs (several GB in a few minutes).
I posted the issue in the Linux Support Forum, but I haven't received any news, except for someone who has the same problem. You can see the details in this thread: Huge amount of error logs when camera doesn't return framerate

I hope that someone can help me on that here.
Thanks in advance
 

OmegaFlatulence

New Member
Hi, is there any way to set the video capture device to a custom resolution? I use a datapath Vision card and capture numerous arcade PCB's that have non standard resolutions (such as 384x224 and 448x224) but I'm unable to dial these in like in a Windows build. Is there any way to manually set these capture resolutions with the current OBS v4l2 module? Is there a work around if it's not possible?
 

Dakas

New Member
Hi, I think just recently I found "MJPEG" as a native pixel format option (in addition to the previous alternatives of YUV/YVU/BGR3 (emulated) that are still present) for some V4L2 capture devices. A pleasant surprise, but I have not been able to find anything in the release announcements that would suggest when or where this has been added. Anybody has a suggestion when this might have happened? Or is this a consequence of kernel updates or library changes or possibly some other change unrelated to OBS?
 

Dakas

New Member
Hi, I think just recently I found "MJPEG" as a native pixel format option (in addition to the previous alternatives of YUV/YVU/BGR3 (emulated) that are still present) for some V4L2 capture devices. A pleasant surprise, but I have not been able to find anything in the release announcements that would suggest when or where this has been added. Anybody has a suggestion when this might have happened? Or is this a consequence of kernel updates or library changes or possibly some other change unrelated to OBS?

I presume that this is due to the following commit (significant time span between creation and actual commit in its current form):
Code:
commit 1c2aea4f89659d69080c397e3377e6183990a135
Author:     Morten Bøgeskov <source@kosmisk.dk>
AuthorDate: Sun Jun 7 10:12:01 2020 +0200
Commit:     Jim <obs.jim@gmail.com>
CommitDate: Tue Nov 2 06:04:54 2021 -0700

    linux-v4l2: Support for Motion-JPEG codec
 

Bellator138

New Member
Hello! I'm new here. I installed it and the Qt V4L2 video capture utility does not open at all. The Video test utility opens just fine though. I don't know how to run it in a terminal so I need help with that part so I can post a log file.

Thanks!
 
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