libavfilter dependency 1.16.2

[Jerry Geis]

I am getting this error:

The Meson build system
Version: 0.49.2
Source dir: /home/silentm/webkit/gst_all/gst-libav-1.16.2
Build dir: /home/silentm/webkit/gst_all/gst-libav-1.16.2/build
Build type: native build
Project name: gst-libav
Project version: 1.16.2
Appending LDFLAGS from environment: '-L/usr/lib64'
Native C compiler: cc (gcc 8.3.1 "cc (GCC) 8.3.1 20190507 (Red Hat
8.3.1-4)")
Appending LDFLAGS from environment: '-L/usr/lib64'
Native C++ compiler: c++ (gcc 8.3.1 "c++ (GCC) 8.3.1 20190507 (Red Hat
8.3.1-4)")
Build machine cpu family: x86_64
Build machine cpu: x86_64
Found pkg-config: /usr/bin/pkg-config (1.4.2)
Found CMake: /usr/bin/cmake (3.11.4)
Dependency libavfilter found: NO (tried pkgconfig and cmake)
Looking for a fallback subproject for the dependency libavfilter
Couldn't use fallback subproject in subprojects/FFmpeg for the dependency
libavfilter
Reason: Failed to initialize 'subprojects/FFmpeg':
Subproject directory not found and FFmpeg.wrap file not found

meson.build:18:0: ERROR:  Dependency "libavfilter" not found, tried
pkgconfig and cmake


Gstreamer 1.16.2
I dont know why. I cannot find a libavfilter???
CentOS 8 is my OS.

Thanks.

Jerry
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