GStreamer with QT6

[Joe von Habsburg]

I want to add gstreamer to my qt6 cmake project. How can I add it? I could not.

[JoeCFD]

Linux or Windows?

[SGaist]

Hi,

Beside the platform as requested by @JoeCFD, do you mean you want to use the QtMultimedia backend or use GStreamer explicitly in your code ?

[Joe von Habsburg]

@JoeCFD said in GStreamer with QT6:

Linux or Windows?

for windows.

@SGaist said in GStreamer with QT6:

QtMultimedia backend or use GStreamer explicitly in your code ?

when I use QtMultimedia rtsp stream is lagging or freezing. but If I use gstream there is a no problem. How can I implement my code or how can I watch stream like gstream quality ?

[JoeCFD]

I think pkg can be applied in Windows as well. Try the following example

find_package( PkgConfig REQUIRED )
pkg_search_module( GSTREAMER REQUIRED IMPORTED_TARGET gstreamer-1.0 >= 1.22 )
pkg_search_module( GSTREAMER-VIDEO REQUIRED IMPORTED_TARGET gstreamer-video-1.0 >= 1.22 )
target_link_libraries( ${PROJECT_NAME} PkgConfig::GSTREAMER
PkgConfig::GSTREAMER-VIDEO )

The path in the pkg files of gstreamer might not be right. However, it can be changed in all pkg files. I guess relative path is good enough and works for me on Linux. You need to figure out how to set pkg path on Windows.

[Joe von Habsburg]

@JoeCFD said in GStreamer with QT6:

pkg_search_module(

C:\Users\X\Desktop\XX\XXX\CMakeLists.txt:13: error: A required package was not found

Call stack:
C:\Users\X\Desktop\XX\XXX\CMakeLists.txt:13 (pkg_check_modules)
C:/Qt/Tools/CMake_64/share/cmake-3.27/Modules/FindPkgConfig.cmake:829 (_pkg_check_modules_internal)
C:/Qt/Tools/CMake_64/share/cmake-3.27/Modules/FindPkgConfig.cmake:607 (message)

[Joe von Habsburg]

Call stack:
C:\Users\X\Desktop\XX\XXX\CMakeLists.txt:13: error: None of the required 'gstreamer-1.0' found

C:\Users\X\Desktop\XX\XXX\CMakeLists.txt:14: error: None of the required 'gstreamer-video-1.0' found

[JoeCFD]

@Joe-von-Habsburg I edited my post. You need to figure out how to set pkg path on Windows.

On linux:
export PKG_CONFIG_PATH=/opt/thirdParties/gstreamer/lib/pkgconfig:$PKG_CONFIG_PATH

it is easier to use pkg config to add packages into a project because all dependencies are taken care of. But you can add all libs manually as well.

[Joe von Habsburg]

@JoeCFD said in GStreamer with QT6:

I edited my post.

[JoeCFD]

@Joe-von-Habsburg I think you did not set pkg configure path. If you do not know how to set it, find the pkg files in gstreamer installation and add all the libs inside to your project.

[Joe von Habsburg]

@JoeCFD said in GStreamer with QT6:

I think you did not set pkg configure path. If you do not know how to set it, find the pkg files in gstreamer installation and add all the libs inside to your project.

PKG_CONFIG_PATH=C:/gstreamer/1.0/msvc_x86_64/bin/pkgconfig:$PKG_CONFIG_PATH

[JoeCFD]

@Joe-von-Habsburg pkg config path is under gstreamer lib dir.
For example in Linux
/opt/thirdParties/gstreamer/lib/pkgconfig
Maybe it is different in Windows
and pkg-config.exe has to be in system path of Windows.

[Joe von Habsburg]

@JoeCFD said in GStreamer with QT6:

@Joe-von-Habsburg pkg config path is under gstreamer lib dir.
For example in Linux
/opt/thirdParties/gstreamer/lib/pkgconfig
Maybe it is different in Windows

There is only C:/gstreamer/1.0/msvc_x86_64/bin/pkg-config.exe

[JoeCFD]

add C:/gstreamer/1.0/msvc_x86_64/bin to PATH on Windows. This enables you to run pkg-config.exe and use pkg-config. Nice that gstreamer includes it for you.
go to C:/gstreamer/1.0/msvc_x86_64/lib to find dir pkgconfig. Add C:/gstreamer/1.0/msvc_x86_64/lib/pkgconfig to PKG_CONFIG_PATH

Do not forget to add gstreamer plugin path as well in your env. Otherwise, you can not run your gstreamer app.

[Joe von Habsburg]

@JoeCFD said in GStreamer with QT6:

C:/gstreamer/1.0/msvc_x86_64/bin to PATH on Window

it already exists

@JoeCFD said in GStreamer with QT6:

C:/gstreamer/1.0/msvc_x86_64/lib to find dir pkgconfig

there is no pkg lib

@JoeCFD said in GStreamer with QT6:

C:/gstreamer/1.0/msvc_x86_64/lib/pkgconfig

its not here.

I have only pkg-config exe in C:/gstreamer/1.0/msvc_x86_64/bin/pkg-config.exe

[JoeCFD]

If it does not exist, you are unable to use it. I can check it out later for you in my home Windows.

[Joe von Habsburg]

@JoeCFD thank you so much, I will wait and research new solutions

[JoeCFD]

@Joe-von-Habsburg
https://stackoverflow.com/questions/63026758/cannot-compile-gstreamer-on-windows-because-it-is-missing-glib-2-0

it can be there. Try to reinstall it in different ways.

[Joe von Habsburg]

I download files with msys :

pacman -S mingw-w64-x86_64-gstreamer mingw-w64-x86_64-gst-plugins-base \
      mingw-w64-x86_64-gst-plugins-good mingw-w64-x86_64-gst-plugins-bad \
      mingw-w64-x86_64-gst-plugins-ugly mingw-w64-x86_64-gst-libav \
      mingw-w64-x86_64-gst-rtsp-server

and I copy the pkgconfig to lib like that

and gsreamer-1.0.pc and gsteamer-video-1.0.pc exist

cmake like that :

PKG_CONFIG_PATH=C:/gstreamer/1.0/msvc_x86_64/lib/pkgconfig:$PKG_CONFIG_PATH
find_package( PkgConfig REQUIRED )
pkg_search_module( GSTREAMER REQUIRED IMPORTED_TARGET gstreamer-1.0)
pkg_search_module( GSTREAMER-VIDEO REQUIRED IMPORTED_TARGET gstreamer-video-1.0)

but its not work

[JoeCFD]

@Joe-von-Habsburg said in GStreamer with QT6:

PKG_CONFIG_PATH=C:/gstreamer/1.0/msvc_x86_64/lib/pkgconfig:$PKG_CONFIG_PATH

":" is missing in the picture.
PKG_CONFIG_PATH=C:/gstreamer/1.0/msvc_x86_64/lib/pkgconfig:$PKG_CONFIG_PATH