Building with MediaPlayer error

[sangshengjie]

When I built with MediaPlayer (v0.4), an error came out：
Linking CXX executable MediaPlayerTest
undefined reference to `g_type_check_instance_is_fundamentally_a'

[JamieMeyers]

Hi @sangshengjie,

Can you please provide more details about your build environment. What OS are you compiling on? What compiler and version are you using? What version of GStreamer are you using? Please include any other details you think would be relevant. Also, if you have a larger snippet of the error, that would help us investigate your issue.

Thanks,
Jamie

[sangshengjie]

Hi @JamieMeyers
Hi @JamieMeyers
My OS is ubuntu 14.04 LTS，
compiler is gcc (Ubuntu 4.9.4-2ubuntu1~14.04.1) 4.9.4
gstreamer-1.12.0
gst-plugins-good-1.12.0
gst-plugins-base-1.12.0
glib-2.42.2

following is the error:

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[knikhila]

Hi @sangshengjie,

Thanks for the information.
It looks like the glib library is not being linked when you attempt to build.
Can you please take a look at the pkgconfig directory and ensure glib-2.0 is present in it?

Thanks,
Nikhila

[sangshengjie]

Hi @knikhila
there is glib-2.0.pc in the pkgconfig directory (/usr/local/lib/pkgconfig/)， as follows
`prefix=/usr/local
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include

glib_genmarshal=glib-genmarshal
gobject_query=gobject-query
glib_mkenums=glib-mkenums

Name: GLib
Description: C Utility Library
Version: 2.42.2
Requires.private:
Libs: -L${libdir} -lglib-2.0
Libs.private: -pthread
Cflags: -I${includedir}/glib-2.0 -I${libdir}/glib-2.0/include `

Thanks,
sangshengjie

[knikhila]

Hi @sangshengjie,

It looks like for local Gstreamer builds, we are missing the pkgConfig path. Can you please try by adding the following line in MediaPlayer/CMakeLists.txt right before the line find_package(PkgConfig) ?

set(PKG_CONFIG_USE_CMAKE_PREFIX_PATH ON)

Enabling the PKG_CONFIG_USE_CMAKE_PREFIX_PATH adds the paths in CMAKE_PREFIX_PATH to pkg-config search path.

After adding the line, CMakeLists.txt should look like this:
....
set(PKG_CONFIG_USE_CMAKE_PREFIX_PATH ON)
find_package(PkgConfig)
...

You will have to run CMake again.
cmake <path_to_source_ directory> -DGSTREAMER_MEDIA_PLAYER=ON -DCMAKE_PREFIX_PATH=<path_to_local_build>
(In your case, it looks like the path to the local build might be /use/local/.)

Please let us know how it goes.

Thanks,
Nikhila

[sangshengjie]

Hi @knikhila
When I did as you said, it didn't work. Then I add the line to the MediaPlayer/CMakeLists.txt， it resolved.
link_libraries(/usr/local/lib/libgobject-2.0.so)
It seems my gobject lib need to be explicitly linked.

Thanks very much.

[JamieMeyers]

We've clarified the instructions in 0.4.1 as well to help out with this issue.