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obs/v4l2: added troubleshooting for error
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@ -19,6 +19,19 @@ It features the same syntax.
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This section addresses various usages of the arch linux package managers.
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### Downgrading Packages
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Packages of the AUR can be downgraded by using the
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[Downgrade](https://github.com/archlinux-downgrade/downgrade) program.
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This program can then easily be used to an AUR package.
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This works like the following assuming the package `v4l2loopback-dmks` needs to be downgraded.
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```sh
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sudo downgrade v4l2loopback-dmks
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```
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Afterwards the target version can be selected and the downgrading process will conclude.
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#### Manual Installation of a `PKGBUILD` File
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A `PKGBUILD` file is a [shell](/wiki/linux/shell.md) script that contains the installation
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@ -21,6 +21,11 @@ package needs to be installed.
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Some distributions have a package named `v4l2loopback-dkms` in the package
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manager, making the manual installation process unnecessary.
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Make sure to
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[start the service](/wiki/linux/systemd.md#startstopenabledisable-a-service) by
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running `systemctl start v4l2loopback.service` and/or enable it to start after each
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boot with `systemctl enable v4l2loopback.service`.
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### Usage
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This section focusses on various use-cases for the v4l2loopback software.
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@ -75,3 +80,18 @@ Afterwards enable the service to start at every boot process by running:
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```sh
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sudo systemctl enable v4l2loopback
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```
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## Troubleshooting
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This section focusses on various errors that can appear in the v4l2loopback software.
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### `Failed to start streaming on '/dev/video2' (Invalid argument)`
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This error does occur most of the time when trying to start
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[OBS' virtual camera](/wiki/obs.md#virtual-camera).
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This section is based on an
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[OBS Forum entry by rebelduck](https://obsproject.com/forum/threads/obs-virtual-camera-failed-to-start-streaming-on-dev-video2-invalid-argument.184717/)
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To fix it downgrade the packages `v4l2loopback-dkms` and `v4l2loopback-utils` to the last working
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version.
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For [Arch Linux](/wiki/linux/arch-linux.md) this can be achieved by using
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[Downgrade](/wiki/linux/package_manager.md#downgrading-packages).
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17
wiki/obs.md
17
wiki/obs.md
@ -20,10 +20,6 @@ camera.
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First of all [V4L2](./linux/v4l2.md) needs to be set up.
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This guide assumes it is set up according to the section in the
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[V4L2 entry](./linux/v4l2.md#v4l2loopback).
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Make sure to
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[start the service](/wiki/linux/systemd.md#startstopenabledisable-a-service) by
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running `systemctl start v4l2loopback.service` or enable it to start after each
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boot with `systemctl enable v4l2loopback.service`.
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Afterwards the virtual camera can be started.
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### Background Removal
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@ -39,3 +35,16 @@ describes various possibilities to install the background removal for OBS on
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different systems.
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On Linux systems background removal is often contained in a package named
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`obs-backgroundremoval` or similarly.
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## Troubleshooting
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This section focusses on various errors that can appear by using OBS.
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### `Output Failed: If you are using NVENC or AMD encoders, make sure the video drivers are up to date`
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This error does occur most of the time when trying to start
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[OBS' virtual camera](/wiki/obs.md#virtual-camera).
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If all the drivers are up to date there is a chance that it is caused by a bug or error in the code
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of [V4L2](/wiki/linux/v4l2.md).
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A possible fix is described in a
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[corresponding section of the V4L2 entry](/wiki/linux/v4l2.md#failed-to-start-streaming-on-devvideo2-invalid-argument).
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