Enable Gstreamer in Qt5 configuration

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

moritzh · wrote on 15 Sept 2014, 23:05

No, I'm building Qt direct on the Raspberry, like on the wiki page.

Sorry if I understand your question wrong when you asked if I had the filesystem accessible on my desktop computer. At the moment I dont have it on my desktop pc, I wanted to say that I could easily access it if needed for the solution by just insert the Raspberry Pi SD Card to my desktop computer. (Did you mean if I had an image of the filesystem on my desktop computer for cross compiling? => No)

If your thinking of the CROSS_COMPILE option by calling configure: This is sayed on the wiki page:

bq. In order to properly run configure for Qt5 on the Raspberry Pi, you need to point the CROSS_COMPILE variable to the native compiler located at /usr/bin/g++. The CROSS_COMPILE parameter is the path to the compiler (without the g++). If you do not do this properly it will complain that it is not being cross compiled.

SGaist · wrote on 15 Sept 2014, 23:31

My bad, I was thinking about the SYSROOT parameter that was missing. But in your case it's unrelated.

moritzh · wrote on 7 Oct 2014, 11:21

Found the solution in the compile logfiles. The configure script does not search for gstreamer anymore. Qt searches for gstreamer during compile of qt multimedia plugin in. But the compile step needs pkg-config to be set (see above) to find gstreamer.

Now I can play videos, but very very slow, so I don't know if additional steps are needed for hardware acceleration.