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obs/v4l2: added troubleshooting for error

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13
wiki/linux/package_manager.md
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@ -19,6 +19,19 @@ It features the same syntax.
This section addresses various usages of the arch linux package managers. This section addresses various usages of the arch linux package managers.
### Downgrading Packages
Packages of the AUR can be downgraded by using the
[Downgrade](https://github.com/archlinux-downgrade/downgrade) program.
This program can then easily be used to an AUR package.
This works like the following assuming the package `v4l2loopback-dmks` needs to be downgraded.
```sh
sudo downgrade v4l2loopback-dmks
```
Afterwards the target version can be selected and the downgrading process will conclude.
#### Manual Installation of a `PKGBUILD` File #### Manual Installation of a `PKGBUILD` File
A `PKGBUILD` file is a [shell](/wiki/linux/shell.md) script that contains the installation A `PKGBUILD` file is a [shell](/wiki/linux/shell.md) script that contains the installation

20
wiki/linux/v4l2.md
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@ -21,6 +21,11 @@ package needs to be installed.
Some distributions have a package named `v4l2loopback-dkms` in the package Some distributions have a package named `v4l2loopback-dkms` in the package
manager, making the manual installation process unnecessary. manager, making the manual installation process unnecessary.
Make sure to
[start the service](/wiki/linux/systemd.md#startstopenabledisable-a-service) by
running `systemctl start v4l2loopback.service` and/or enable it to start after each
boot with `systemctl enable v4l2loopback.service`.
### Usage ### Usage
This section focusses on various use-cases for the v4l2loopback software. This section focusses on various use-cases for the v4l2loopback software.
@ -75,3 +80,18 @@ Afterwards enable the service to start at every boot process by running:
```sh ```sh
sudo systemctl enable v4l2loopback sudo systemctl enable v4l2loopback
``` ```
## Troubleshooting
This section focusses on various errors that can appear in the v4l2loopback software.
### `Failed to start streaming on '/dev/video2' (Invalid argument)`
This error does occur most of the time when trying to start
[OBS' virtual camera](/wiki/obs.md#virtual-camera).
This section is based on an
[OBS Forum entry by rebelduck](https://obsproject.com/forum/threads/obs-virtual-camera-failed-to-start-streaming-on-dev-video2-invalid-argument.184717/)
To fix it downgrade the packages `v4l2loopback-dkms` and `v4l2loopback-utils` to the last working
version.
For [Arch Linux](/wiki/linux/arch-linux.md) this can be achieved by using
[Downgrade](/wiki/linux/package_manager.md#downgrading-packages).

17
wiki/obs.md
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@ -20,10 +20,6 @@ camera.
First of all [V4L2](./linux/v4l2.md) needs to be set up. First of all [V4L2](./linux/v4l2.md) needs to be set up.
This guide assumes it is set up according to the section in the This guide assumes it is set up according to the section in the
[V4L2 entry](./linux/v4l2.md#v4l2loopback). [V4L2 entry](./linux/v4l2.md#v4l2loopback).
Make sure to
[start the service](/wiki/linux/systemd.md#startstopenabledisable-a-service) by
running `systemctl start v4l2loopback.service` or enable it to start after each
boot with `systemctl enable v4l2loopback.service`.
Afterwards the virtual camera can be started. Afterwards the virtual camera can be started.
### Background Removal ### Background Removal
@ -39,3 +35,16 @@ describes various possibilities to install the background removal for OBS on
different systems. different systems.
On Linux systems background removal is often contained in a package named On Linux systems background removal is often contained in a package named
`obs-backgroundremoval` or similarly. `obs-backgroundremoval` or similarly.
## Troubleshooting
This section focusses on various errors that can appear by using OBS.
### `Output Failed: If you are using NVENC or AMD encoders, make sure the video drivers are up to date`
This error does occur most of the time when trying to start
[OBS' virtual camera](/wiki/obs.md#virtual-camera).
If all the drivers are up to date there is a chance that it is caused by a bug or error in the code
of [V4L2](/wiki/linux/v4l2.md).
A possible fix is described in a
[corresponding section of the V4L2 entry](/wiki/linux/v4l2.md#failed-to-start-streaming-on-devvideo2-invalid-argument).