How To Install libv4l on CentOS 8

libv4l is Collection of video4linux support libraries Collection of video4linux support libraries

Introduction

In this tutorial we learn how to install libv4l on CentOS 8.

What is libv4l

libv4l is a collection of libraries which adds a thin abstraction layer on top of video4linux2 devices. The purpose of this (thin) layer is to make it easy for application writers to support a wide variety of devices without having to write separate code for different devices in the same class. libv4l consists of 3 different libraries libv4lconvert offers functions to convert from any (known) pixel-format to V4l2_PIX_FMT_BGR24 or V4l2_PIX_FMT_YUV420. libv4l1 offers the (deprecated) v4l1 API on top of v4l2 devices, independent of the drivers for those devices supporting v4l1 compatibility (which many v4l2 drivers do not). libv4l2 offers the v4l2 API on top of v4l2 devices, while adding for the application transparent libv4lconvert conversion where necessary. libv4l 1.14.2 3.el8 x86_64 194 k v4l-utils-1.14.2-3.el8.src.rpm appstream Collection of video4linux support libraries http LGPLv2+ and GPLv2 libv4l is a collection of libraries which adds a thin abstraction layer on top of video4linux2 devices. The purpose of this (thin) layer is to make it easy for application writers to support a wide variety of devices without having to write separate code for different devices in the same class. libv4l consists of 3 different libraries libv4lconvert offers functions to convert from any (known) pixel-format to V4l2_PIX_FMT_BGR24 or V4l2_PIX_FMT_YUV420. libv4l1 offers the (deprecated) v4l1 API on top of v4l2 devices, independent of the drivers for those devices supporting v4l1 compatibility (which many v4l2 drivers do not). libv4l2 offers the v4l2 API on top of v4l2 devices, while adding for the application transparent libv4lconvert conversion where necessary.

We can use yum or dnf to install libv4l on CentOS 8. In this tutorial we discuss both methods but you only need to choose one of method to install libv4l.

Install libv4l on CentOS 8 Using dnf

Update yum database with dnf using the following command.

sudo dnf makecache --refresh

The output should look something like this:

CentOS Linux 8 - AppStream                                       43 kB/s | 4.3 kB     00:00    
CentOS Linux 8 - BaseOS                                          65 kB/s | 3.9 kB     00:00    
CentOS Linux 8 - ContinuousRelease                               43 kB/s | 3.0 kB     00:00    
CentOS Linux 8 - Extras                                          23 kB/s | 1.5 kB     00:00    
CentOS Linux 8 - FastTrack                                       40 kB/s | 3.0 kB     00:00    
CentOS Linux 8 - HighAvailability                                36 kB/s | 3.9 kB     00:00    
CentOS Linux 8 - Plus                                            24 kB/s | 1.5 kB     00:00    
CentOS Linux 8 - PowerTools                                      50 kB/s | 4.3 kB     00:00    
Extra Packages for Enterprise Linux Modular 8 - x86_64           13 kB/s | 9.2 kB     00:00    
Extra Packages for Enterprise Linux 8 - x86_64                   24 kB/s | 8.5 kB     00:00    
Metadata cache created.

After updating yum database, We can install libv4l using dnf by running the following command:

sudo dnf -y install libv4l

Install libv4l on CentOS 8 Using yum

Update yum database with yum using the following command.

sudo yum makecache --refresh

The output should look something like this:

CentOS Linux 8 - AppStream                                       43 kB/s | 4.3 kB     00:00    
CentOS Linux 8 - BaseOS                                          65 kB/s | 3.9 kB     00:00    
CentOS Linux 8 - ContinuousRelease                               43 kB/s | 3.0 kB     00:00    
CentOS Linux 8 - Extras                                          23 kB/s | 1.5 kB     00:00    
CentOS Linux 8 - FastTrack                                       40 kB/s | 3.0 kB     00:00    
CentOS Linux 8 - HighAvailability                                36 kB/s | 3.9 kB     00:00    
CentOS Linux 8 - Plus                                            24 kB/s | 1.5 kB     00:00    
CentOS Linux 8 - PowerTools                                      50 kB/s | 4.3 kB     00:00    
Extra Packages for Enterprise Linux Modular 8 - x86_64           13 kB/s | 9.2 kB     00:00    
Extra Packages for Enterprise Linux 8 - x86_64                   24 kB/s | 8.5 kB     00:00    
Metadata cache created.

After updating yum database, We can install libv4l using yum by running the following command:

sudo yum -y install libv4l

How To Uninstall libv4l on CentOS 8

To uninstall only the libv4l package we can use the following command:

sudo dnf remove libv4l

libv4l Package Contents on CentOS 8

/usr/lib/.build-id
/usr/lib/.build-id/1e
/usr/lib/.build-id/1e/7f485d2c54ad1a1d7d74aae249f71ff876b772
/usr/lib/.build-id/3d/6e0f32909a039112a306dce841e4973ce651a1
/usr/lib/.build-id/6f
/usr/lib/.build-id/6f/65244e2012e4788a8cc91824b0fa59b69f1b07
/usr/lib/.build-id/77
/usr/lib/.build-id/77/a23aec3c7f6e6bb008ab2197e1a9bb53a5fb36
/usr/lib/.build-id/7c
/usr/lib/.build-id/7c/148bd379fcb34f95ef6f469dff8d379ce8015e
/usr/lib/.build-id/83
/usr/lib/.build-id/83/13805cefc5155f166025d78804190f2fa1e1a8
/usr/lib/.build-id/99
/usr/lib/.build-id/99/27f421df2c715ca8bcfbd5264586f75e0b1722
/usr/lib/.build-id/a0
/usr/lib/.build-id/a0/3ec72e8961de5f6564f8b08a23d1035d1f68ae
/usr/lib/.build-id/b8
/usr/lib/.build-id/b8/1393d4b7728227671a2ea784588100a49a762f
/usr/lib64/libv4l
/usr/lib64/libv4l/ov511-decomp
/usr/lib64/libv4l/ov518-decomp
/usr/lib64/libv4l/plugins
/usr/lib64/libv4l/plugins/libv4l-mplane.so
/usr/lib64/libv4l/v4l1compat.so
/usr/lib64/libv4l/v4l2convert.so
/usr/lib64/libv4l1.so.0
/usr/lib64/libv4l1.so.0.0.0
/usr/lib64/libv4l2.so.0
/usr/lib64/libv4l2.so.0.0.0
/usr/lib64/libv4l2rds.so.0
/usr/lib64/libv4l2rds.so.0.0.0
/usr/lib64/libv4lconvert.so.0
/usr/lib64/libv4lconvert.so.0.0.0
/usr/share/doc/libv4l
/usr/share/doc/libv4l/ChangeLog
/usr/share/doc/libv4l/README.libv4l
/usr/share/doc/libv4l/TODO
/usr/share/licenses/libv4l
/usr/share/licenses/libv4l/COPYING
/usr/share/licenses/libv4l/COPYING.libv4l
/usr/lib/.build-id
/usr/lib/.build-id/20
/usr/lib/.build-id/20/b1b15f9b48874a600e506234a04874cf6b56a4
/usr/lib/.build-id/3e
/usr/lib/.build-id/3e/860458f84d40ed465698ed565ad6a06da834fe
/usr/lib/.build-id/4f
/usr/lib/.build-id/4f/b527f11981a1b56d48e09a7939889358df20f2
/usr/lib/.build-id/88/508de9283a166135069f0f85725ba8c572d6e6
/usr/lib/.build-id/a1
/usr/lib/.build-id/a1/a6722bdd7a86577d1c54ed23d639d3b9c3824b
/usr/lib/.build-id/b2
/usr/lib/.build-id/b2/db08c1a75647b5dc5801f2cdca13480296567d
/usr/lib/.build-id/bf
/usr/lib/.build-id/bf/001e7b549df8f07623b81f06f60296e9e8dc93
/usr/lib/.build-id/e9
/usr/lib/.build-id/e9/9715b544ffca454d71246af79513ef82945f91
/usr/lib/.build-id/f0
/usr/lib/.build-id/f0/72f4b121bb18e1ce2632868050b97ed9359d63
/usr/lib/libv4l
/usr/lib/libv4l/ov511-decomp
/usr/lib/libv4l/ov518-decomp
/usr/lib/libv4l/plugins
/usr/lib/libv4l/plugins/libv4l-mplane.so
/usr/lib/libv4l/v4l1compat.so
/usr/lib/libv4l/v4l2convert.so
/usr/lib/libv4l1.so.0
/usr/lib/libv4l1.so.0.0.0
/usr/lib/libv4l2.so.0
/usr/lib/libv4l2.so.0.0.0
/usr/lib/libv4l2rds.so.0
/usr/lib/libv4l2rds.so.0.0.0
/usr/lib/libv4lconvert.so.0
/usr/lib/libv4lconvert.so.0.0.0
/usr/share/doc/libv4l
/usr/share/doc/libv4l/ChangeLog
/usr/share/doc/libv4l/README.libv4l
/usr/share/doc/libv4l/TODO
/usr/share/licenses/libv4l
/usr/share/licenses/libv4l/COPYING
/usr/share/licenses/libv4l/COPYING.libv4l

References

Summary

In this tutorial we learn how to install libv4l on CentOS 8 using yum and dnf.