Enable Gstreamer in Qt5 configuration

SGaist · wrote on 8 Aug 2013, 14:00

Since you are cross-compiling, you also need to either get the ARM version of these libraries or cross-compile them.

MeowMeow · wrote on 8 Aug 2013, 14:11

Yes, i get the libraries - armel version, they are debian file and i install them by command "dpkg".

SGaist · wrote on 8 Aug 2013, 14:31

Where did you install them ?

MeowMeow · wrote on 8 Aug 2013, 15:52

I install them on target rootfs.

SGaist · wrote on 8 Aug 2013, 19:46

Then how can the configure script find the libraries ?

One way to do that is to copy the libraries and headers from your target rootfs in your toolchain directories

_Mark_ · wrote on 6 Oct 2013, 18:29

Hello, I know this thread is quite old but I'm running into the same issues. I mounted the target's rootfs in a local folder and I set the sysroot parameter to that path.

In that folder there is the complete arm filesystem with these packages installed:

@
libgstreamer0.10-dev
libgstreamer-plugins-base0.10-dev
gstreamer-tools
gstreamer0.10-plugins-bad
gstreamer0.10-plugins-good
gstreamer0.10-plugins-ugly
libglib2.0-dev
libglib2.0-0
libqtglib-2.0-0
@

Here the configure command:

@
./configure -opengl es2 -device linux-rasp-pi-g++ -device-option CROSS_COMPILE=~/dev/rpi/gcc-4.7-linaro-rpi-gnueabihf/bin/arm-linux-gnueabihf- -sysroot /mnt/rasp-pi-rootfs -opensource -confirm-license -optimized-qmake -reduce-relocations -reduce-exports -release -developer-build -make libs -prefix /usr/local/qt5pi -no-pch -nomake examples -nomake tests -silent
@

Anyway both GLib and GStreamer supports are disabled. Here the related errors:

@
Glib auto-detection... ()
compiling glib.cpp
glib.cpp: In function ‘int main(int, char**)’:
glib.cpp:48:19: warning: variable ‘context’ set but not used [-Wunused-but-set-variable]
glib.cpp:55:38: warning: ‘pollfd’ is used uninitialized in this function [-Wuninitialized]
linking glib
/home/femtotech/dev/rpi/gcc-4.7-linaro-rpi-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/4.7.2/../../../../arm-linux-gnueabihf/bin/ld: /mnt/rasp-pi-rootfs/usr/lib/arm-linux-gnueabihf/libglib-2.0.a(gmain.o): undefined reference to symbol 'clock_gettime@@GLIBC_2.4'
/home/femtotech/dev/rpi/gcc-4.7-linaro-rpi-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/4.7.2/../../../../arm-linux-gnueabihf/bin/ld: note: 'clock_gettime@@GLIBC_2.4' is defined in DSO /mnt/rasp-pi-rootfs/lib/arm-linux-gnueabihf/librt.so.1 so try adding it to the linker command line
/mnt/rasp-pi-rootfs/lib/arm-linux-gnueabihf/librt.so.1: could not read symbols: Invalid operation
collect2: error: ld returned 1 exit status
make: *** [glib] Error 1
Glib disabled.
@

But the /mnt/rasp-pi-rootfs/lib/arm-linux-gnueabihf/librt.so.1 is there, actually.

Any ideas?

MeowMeow · wrote on 14 Oct 2013, 06:41

Dear Mark,
Please check the link to librt.so.1
Maybe it's broken

_dmp · wrote on 4 Dec 2013, 07:44

I cross compile Qt 5.2 for imx6 from source and ./configure just dont try find gstreamer from rootfs. I look at ./configure inside and dont find anything about gstreamer. What can I do?

maatong · wrote on 30 Apr 2014, 17:14

[quote author="_dmp" date="1386143087"]I cross compile Qt 5.2 for imx6 from source and ./configure just dont try find gstreamer from rootfs. I look at ./configure inside and dont find anything about gstreamer. What can I do?[/quote]

Have you solved this problem?
I'm working on it too.

andreyc · wrote on 30 Apr 2014, 17:39

I did not try to cross-compile neither Qt nor GStreamer. So this is just my guess.
On Linux Qt configure tries to find gstreamer using pkg-config utility.
pkg-config uses $PKG_CONFIG_PATH to look for all available packages.
The packages are the text files with simple structure and .pc extension.

Try to find gstreamer*.pc files in your cross-compiled gstreamer and if you find the files then append a path to these files to PKG_CONFIG_PATH environment variable and then run configure from Qt.

moritzh · wrote on 15 Sept 2014, 10:51

Is there meanwhile a solution on how to configure Qt5.3 to use gstreamer? I have the same Problem on the Raspberry Pi.

I'm using this tutorial: http://qt-project.org/wiki/Native_Build_of_Qt5_on_a_Raspberry_Pi
I ignored the change of "QT_CFLAGS_GSTREAMER=" in the configure script, because it is not there. Additionally I set the following environment variables before running configure to get "pkg-config ............. yes":
@PKG_CONFIG_LIBDIR="/usr/lib/pkgconfig:/usr/lib/arm-linux-gnueabihf/pkgconfig:/usr/share/pkgconfig"
PKG_CONFIG_SYSROOT_DIR="/."
PKG_CONFIG_PATH="/usr/lib/pkgconfig:/usr/lib/arm-linux-gnueabihf/pkgconfig:/usr/share/pkgconfig"@

I read a little bit in the configure script code and at the part where the "Configure summary" is generated I found nothing where it is possible to add additional Packages (for example found by pkg-config) so is it even possible that the configure script finds gstreamer or is it even searching?

SGaist · wrote on 15 Sept 2014, 14:34

Hi and welcome to devnet,

Did you install the gstreamer development packages ?

moritzh · wrote on 15 Sept 2014, 14:54

yes I have installed all packages which are listed on the "wiki page":http://qt-project.org/wiki/Native_Build_of_Qt5_on_a_Raspberry_Pi (first code section line 3). For gstreamer this are the following:
@libgstreamer0.10-dev
libgstreamer-plugins-base0.10-dev
gstreamer-tools
gstreamer0.10-plugins-good
gstreamer0.10-plugins-bad@

gstreamer itselfs works:
@gst-launch-0.10 videotestsrc ! video/x-raw-rgb, framerate=25/1, width=640, height=360 ! ffmpegcolorspace ! fbdevsink@

SGaist · wrote on 15 Sept 2014, 19:23

Did you do that on your Raspberry Pi ?

moritzh · wrote on 15 Sept 2014, 19:25

yes, all direct on the pi, not cross compiling

SGaist · wrote on 15 Sept 2014, 20:29

Do you have your Pi root filesystem accessible on your desktop computer ?

moritzh · wrote on 15 Sept 2014, 20:52

yes i just had to put the Raspi SD Card in the Computer and mount it

SGaist · wrote on 15 Sept 2014, 22:22

What parameters did you pass to configure ?

moritzh · wrote on 15 Sept 2014, 22:33

I copied it from the wiki page: "http://qt-project.org/wiki/Native_Build_of_Qt5_on_a_Raspberry_Pi":http://qt-project.org/wiki/Native_Build_of_Qt5_on_a_Raspberry_Pi

@./configure -v -opengl es2 -device linux-rasp-pi-g++ -device-option CROSS_COMPILE=/usr/bin/ -opensource -confirm-license -optimized-qmake -reduce-exports -release -qt-pcre -make libs -prefix /usr/local/qt5 &> output@

SGaist · wrote on 15 Sept 2014, 22:48

Ok… I missed it the first time… you are following the instructions to build Qt ON the raspberry pi but you are trying to cross-compile it from your desktop…

"This":https://qt-project.org/wiki/RaspberryPi_Beginners_guide guid shows how to cross-compile it