need gstreamer-1.0 >=1.19.0
my system ubuntu 18.04 server ...
meson buildir
The Meson build system
Version: 0.56.0
Source dir: /gds/gits/gst-rtsp-server
Build dir: /gds/gits/gst-rtsp-server/buildir
Build type: native build
Project name: gst-rtsp-server
Project version: 1.19.0.1
C compiler for the host machine: cc (gcc 7.5.0 "cc (Ubuntu 7.5.0-3ubuntu1~18.04) 7.5.0")
C linker for the host machine: cc ld.bfd 2.30
Host machine cpu family: x86_64
Host machine cpu: x86_64
Compiler for C supports link arguments -Wl,-Bsymbolic-functions: YES
Compiler for C supports arguments -fvisibility=hidden: YES
Compiler for C supports arguments -fno-strict-aliasing: YES
Message: Disabling deprecated GLib API
Compiler for C supports arguments -Wmissing-declarations: YES
Compiler for C supports arguments -Wmissing-prototypes: YES
Compiler for C supports arguments -Wredundant-decls: YES
Compiler for C supports arguments -Wundef: YES
Compiler for C supports arguments -Wwrite-strings: YES
Compiler for C supports arguments -Wformat: YES
Compiler for C supports arguments -Wformat-nonliteral: YES
Compiler for C supports arguments -Wformat-security: YES
Compiler for C supports arguments -Wold-style-definition: YES
Compiler for C supports arguments -Waggregate-return: YES
Compiler for C supports arguments -Winit-self: YES
Compiler for C supports arguments -Wmissing-include-dirs: YES
Compiler for C supports arguments -Waddress: YES
Compiler for C supports arguments -Wno-multichar: YES
Compiler for C supports arguments -Wdeclaration-after-statement: YES
Compiler for C supports arguments -Wvla: YES
Compiler for C supports arguments -Wpointer-arith: YES
Found pkg-config: /usr/bin/pkg-config (0.29.1)
Run-time dependency glib-2.0 found: YES 2.56.4
Dependency gstreamer-1.0 found: NO found 1.14.5 but need: '>= 1.19.0'
Found CMake: /usr/bin/cmake (3.10.2)
Run-time dependency gstreamer-1.0 found: NO (tried pkgconfig and cmake)
Looking for a fallback subproject for the dependency gstreamer-1.0
meson.build:138:0: ERROR: Neither a subproject directory nor a gstreamer.wrap file was found.
A full log can be found at /gds/gits/gst-rtsp-server/buildir/meson-logs/meson-log.txt