Gst-python build issue. GObject not found trying to import Gst from gi.repository

tjwilli58 · October 7, 2025, 5:45pm

Finally succeeded in building gstreamer 1.26.6 on Windows 10, python 3.12 using meson. I needed to use options -Dintrospection=enabled -Dlibxml2:python=false. Otherwise, I’d get an error on building libxml2.

When I try to test with a simple import , I get an error.

Python 3.12.10 (tags/v3.12.10:0cc8128, Apr  8 2025, 12:21:36) [MSC v.1943 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import gi
>>> gi.version_info
(3, 50, 1)
>>> gi.require_version('Gst','1.0')
>>> from gi.repository import Gst
Traceback (most recent call last):
  File "D:\opt\gstreamer\lib\site-packages\gi\importer.py", line 139, in create_module
    introspection_module = get_introspection_module(namespace)
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "D:\opt\gstreamer\lib\site-packages\gi\module.py", line 267, in get_introspection_module
    module = IntrospectionModule(namespace, version)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "D:\opt\gstreamer\lib\site-packages\gi\module.py", line 114, in __init__
    repository.require(namespace, version)
gi.RepositoryError: Typelib file for namespace 'GObject', version '2.0' not found

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "D:\opt\gstreamer\lib\site-packages\gi\importer.py", line 141, in create_module
    raise ImportError(e)
ImportError: Typelib file for namespace 'GObject', version '2.0' not found
>>>

It looks to be related to this issue.

I tried to downgrade gobject-introspection but was unsuccessful. In order to get back to this point, I needed to re-clone my gstreamer and start over.

tjwilli58 · October 7, 2025, 5:57pm

Tried to checkout tag 1.26.5, and meson subprojects update.

glib| Dependency zlib from subproject subprojects/zlib-1.3.1 found: YES 1.3.1
glib| Checking if "check for -latomic" links: NO (cached)
glib| Run-time dependency intl found: NO (tried builtin and system)
glib| Run-time dependency intl found: NO (tried builtin and system)

..\subprojects\glib-2.82.4\meson.build:2299:12: ERROR: Dependency "intl" not found, tried builtin and system

A full log can be found at D:\GitClones\gstreamer\build\meson-logs\meson-log.txt
ninja: error: rebuilding 'build.ninja': subcommand failed

FAILED: build.ninja

tjwilli58 · October 7, 2025, 6:18pm

Tried to go back by checking out tag 1.26.6 again and doing meson subprojects update.

Now meson compile -C build gives:

[30/605] Generating subprojects/gstreamer/gst/Gst-1.0.gir with a custom command (wrapped by meson to set PATH, to set env)
FAILED: subprojects/gstreamer/gst/Gst-1.0.gir
"C:\Users\Tim\.virtualenvs\build_gst_py312\Scripts\meson" "--internal" "exe" "--unpickle" "D:\GitClones\gstreamer\build\meson-private\meson_exe_g-ir-scanner_231f0e2bf68e7134a4cbea36bb04451f3f46ab89.dat"
while executing ['C:\\Users\\Tim\\.virtualenvs\\build_gst_py312\\Scripts\\python.EXE', 'D:\\GitClones\\gstreamer\\build\\subprojects\\gobject-introspection-1.84.0\\tools\\g-ir-scanner', '--quiet', '--no-libtool', '--namespace=Gst', '--nsversion=1.0', '--warn-all', '--output', 'subprojects/gstreamer/gst/Gst-1.0.gir', '--add-init-section=extern void gst_init(gint*,gchar**);g_setenv("GST_REGISTRY_DISABLE", "yes", TRUE);g_setenv("GST_REGISTRY_1.0", "/no/way/this/exists.reg", TRUE);g_setenv("GST_PLUGIN_PATH_1_0", "", TRUE);g_setenv("GST_PLUGIN_SYSTEM_PATH_1_0", "", TRUE);g_setenv("GST_TRACERS", "", TRUE);gst_init(NULL,NULL);', '--quiet', '--c-include=gst/gst.h', '--cflags-begin', '-DGST_DISABLE_MINIOBJECT_INLINE_FUNCTIONS', '--cflags-end', '--cflags-begin', '-ID:/GitClones/gstreamer/subprojects/gstreamer/gst/..', '-ID:/GitClones/gstreamer/build/subprojects/gstreamer/gst/..', '--cflags-end', '-ID:/GitClones/gstreamer/subprojects/gstreamer/gst', '-ID:/GitClones/gstreamer/build/subprojects/gstreamer/gst', '-ID:/GitClones/gstreamer/subprojects/gstreamer/.', '-ID:/GitClones/gstreamer/build/subprojects/gstreamer/.', '-ID:/GitClones/gstreamer/subprojects/gstreamer/gst/parse', '-ID:/GitClones/gstreamer/build/subprojects/gstreamer/gst/parse', '-ID:/GitClones/gstreamer/subprojects/glib-2.82.5/gobject', '-ID:/GitClones/gstreamer/build/subprojects/glib-2.82.5/gobject', '-ID:/GitClones/gstreamer/subprojects/glib-2.82.5/.', '-ID:/GitClones/gstreamer/build/subprojects/glib-2.82.5/.', '-ID:/GitClones/gstreamer/subprojects/glib-2.82.5/glib', '-ID:/GitClones/gstreamer/build/subprojects/glib-2.82.5/glib', '-ID:/GitClones/gstreamer/subprojects/proxy-libintl/.', '-ID:/GitClones/gstreamer/build/subprojects/proxy-libintl/.', '-ID:/GitClones/gstreamer/subprojects/glib-2.82.5/gmodule', '-ID:/GitClones/gstreamer/build/subprojects/glib-2.82.5/gmodule', '--filelist=D:/GitClones/gstreamer/build/subprojects/gstreamer/gst/gstreamer-1.0-0.dll.p/Gst_1.0_gir_filelist', '--include=GLib-2.0', '--include=GObject-2.0', '--include=GModule-2.0', '--symbol-prefix=gst', '--identifier-prefix=Gst', '--pkg-export=gstreamer-1.0', '--cflags-begin', '-DG_DISABLE_CAST_CHECKS', '-ID:/GitClones/gstreamer/subprojects/gstreamer/.', '-ID:/GitClones/gstreamer/build/subprojects/gstreamer/.', '-ID:/GitClones/gstreamer/subprojects/gstreamer/gst/parse', '-ID:/GitClones/gstreamer/build/subprojects/gstreamer/gst/parse', '-ID:/GitClones/gstreamer/subprojects/glib-2.82.5/gobject', '-ID:/GitClones/gstreamer/build/subprojects/glib-2.82.5/gobject', '-ID:/GitClones/gstreamer/subprojects/glib-2.82.5/.', '-ID:/GitClones/gstreamer/build/subprojects/glib-2.82.5/.', '-ID:/GitClones/gstreamer/subprojects/glib-2.82.5/glib', '-ID:/GitClones/gstreamer/build/subprojects/glib-2.82.5/glib', '-ID:/GitClones/gstreamer/subprojects/proxy-libintl/.', '-ID:/GitClones/gstreamer/build/subprojects/proxy-libintl/.', '-ID:/GitClones/gstreamer/subprojects/glib-2.82.5/gmodule', '-ID:/GitClones/gstreamer/build/subprojects/glib-2.82.5/gmodule', '-ID:/GitClones/gstreamer/subprojects/libffi/.', '-ID:/GitClones/gstreamer/build/subprojects/libffi/.', '-ID:/GitClones/gstreamer/subprojects/libffi/include', '-ID:/GitClones/gstreamer/build/subprojects/libffi/include', '-ID:/GitClones/gstreamer/subprojects/pcre2-10.44/.', '-ID:/GitClones/gstreamer/build/subprojects/pcre2-10.44/.', '-ID:/GitClones/gstreamer/subprojects/pcre2-10.44/src', '-ID:/GitClones/gstreamer/build/subprojects/pcre2-10.44/src', '-ID:/GitClones/gstreamer/subprojects/gobject-introspection-1.84.0/girepository/.', '-ID:/GitClones/gstreamer/build/subprojects/gobject-introspection-1.84.0/girepository/.', '-DPCRE2_STATIC', '--cflags-end', '--add-include-path=D:/GitClones/gstreamer/build/subprojects/gobject-introspection-1.84.0/gir', '-LD:/GitClones/gstreamer/build/subprojects/gobject-introspection-1.84.0/girepository', '-LD:/GitClones/gstreamer/build/subprojects/glib-2.82.5/glib', '-LD:/GitClones/gstreamer/build/subprojects/proxy-libintl', '-LD:/GitClones/gstreamer/build/subprojects/glib-2.82.5/gobject', '-LD:/GitClones/gstreamer/build/subprojects/libffi/src', '-LD:/GitClones/gstreamer/build/subprojects/glib-2.82.5/gmodule', '--extra-library=girepository-1.0', '--extra-library=glib-2.0', '--extra-library=intl', '--extra-library=gobject-2.0', '--extra-library=gmodule-2.0', '-LD:/GitClones/gstreamer/build/subprojects/gstreamer/gst', '--library', 'gstreamer-1.0', '-LD:/GitClones/gstreamer/build/subprojects/glib-2.82.5/glib', '-LD:/GitClones/gstreamer/build/subprojects/proxy-libintl', '-LD:/GitClones/gstreamer/build/subprojects/glib-2.82.5/gobject', '-LD:/GitClones/gstreamer/build/subprojects/libffi/src', '-LD:/GitClones/gstreamer/build/subprojects/glib-2.82.5/gmodule', '--extra-library=ws2_32', '--extra-library=winmm', '--sources-top-dirs', 'D:/GitClones/gstreamer/subprojects/gstreamer', '--sources-top-dirs', 'D:/GitClones/gstreamer/build/subprojects/gstreamer']
--- stdout ---
Gst-1.0.c
Microsoft (R) Incremental Linker Version 14.44.35217.0
Copyright (C) Microsoft Corporation.  All rights reserved.

Gst-1.0.obj : MSIL .netmodule or module compiled with /GL found; restarting link with /LTCG; add /LTCG to the link command line to improve linker performance
Microsoft (R) Incremental Linker Version 14.44.35217.0
Copyright (C) Microsoft Corporation.  All rights reserved.

LINK : fatal error LNK1181: cannot open input file 'gio-2.0.lib'

--- stderr ---
Microsoft (R) C/C++ Optimizing Compiler Version 19.44.35217 for x64
Copyright (C) Microsoft Corporation.  All rights reserved.

g-ir-cpp-sig1xbtn.c
linking of temporary binary failed: Command '['C:\\Program Files (x86)\\Microsoft Visual Studio\\2022\\BuildTools\\VC\\Tools\\MSVC\\14.44.35207\\bin\\HostX64\\x64\\link.exe', '-out:D:\\GitClones\\gstreamer\\build\\tmp-introspect2lkpsovw\\Gst-1.0.exe', 'D:\\GitClones\\gstreamer\\build\\tmp-introspect2lkpsovw\\Gst-1.0.obj', '-libpath:D:\\GitClones\\gstreamer\\build\\subprojects\\gobject-introspection-1.84.0\\girepository', '-libpath:D:\\GitClones\\gstreamer\\build\\subprojects\\glib-2.82.5\\glib', '-libpath:D:\\GitClones\\gstreamer\\build\\subprojects\\proxy-libintl', '-libpath:D:\\GitClones\\gstreamer\\build\\subprojects\\glib-2.82.5\\gobject', '-libpath:D:\\GitClones\\gstreamer\\build\\subprojects\\libffi\\src', '-libpath:D:\\GitClones\\gstreamer\\build\\subprojects\\glib-2.82.5\\gmodule', '-libpath:D:\\GitClones\\gstreamer\\build\\subprojects\\gstreamer\\gst', '-libpath:D:\\GitClones\\gstreamer\\build\\subprojects\\glib-2.82.5\\glib', '-libpath:D:\\GitClones\\gstreamer\\build\\subprojects\\proxy-libintl', '-libpath:D:\\GitClones\\gstreamer\\build\\subprojects\\glib-2.82.5\\gobject', '-libpath:D:\\GitClones\\gstreamer\\build\\subprojects\\libffi\\src', '-libpath:D:\\GitClones\\gstreamer\\build\\subprojects\\glib-2.82.5\\gmodule', 'gstreamer-1.0.lib', 'girepository-1.0.lib', 'glib-2.0.lib', 'intl.lib', 'gobject-2.0.lib', 'gmodule-2.0.lib', 'ws2_32.lib', 'winmm.lib', '/libpath:D:/GitClones/gstreamer/build/subprojects/glib-2.82.5/gio.lib', '/libpath:D:/GitClones/gstreamer/build/subprojects/glib-2.82.5/gobject.lib', '/libpath:D:/GitClones/gstreamer/build/subprojects/glib-2.82.5/gmodule.lib', '/libpath:D:/GitClones/gstreamer/build/subprojects/glib-2.82.5/glib.lib', '/libpath:D:/GitClones/gstreamer/build/subprojects/proxy-libintl.lib', 'gio-2.0.lib', 'gobject-2.0.lib', 'gmodule-2.0.lib', 'glib-2.0.lib', 'intl.lib']' returned non-zero exit status 1181.

[31/605] Compiling C++ object subprojects/gst-plugins-bad/gst-libs/gst/d3d12/gstd3d12-1.0-0.dll.p/gstd3d12bufferpool.cpp.obj
ninja: build stopped: subcommand failed.
(build_gst_py312) PS D:\GitClones\gstreamer>

tjwilli58 · October 15, 2025, 9:52pm

So I finally broke down and set up cerbero. I succeeded in building gst-python with that, but the process of setting that up broke my meson build. (That route didn’t work anyway, but still.)

tjwilli58 · October 16, 2025, 1:43pm

Rebooting seemed to help in my meson issue. Trying to build gstreamer with meson now…

tjwilli58 · October 24, 2025, 9:30pm

Not sure what updating msys2 has to do with it, but after rebuilding, the GObject not found issue is now resolved.

tjwilli58 · October 24, 2025, 10:14pm

Tested with PATH set to my cerberos build by mistake! Issue remains.