Reinstall Qt5 with QtMultimedia using Ubuntu Mate

[Xenoshell]

@SGaist Isnt it possible to give a command so that qtmultimedia gets installed with qtcore and qtgui too? I really want to install from source and not from a repository.

EDIT: ok i have this whole folder with many qtpackages. There is also qtmultimedia. Do i just have to switch into this folder and hit make and make install ?

EDIT2: Ok i found the commands... just use ./configure -h and you will see all commands to configure the setup

[SGaist]

Build Qt from the top source folder so all modules will be built, you can limit to the ones you want by either passing the -skip parameters for all the modules you don't want, or just delete the corresponding folders.

However, for the dependencies of QtMultimedia, either you install them using the package manager or your build and install them all by hand before building Qt.

[Xenoshell]

@SGaist Well ok i found with ./configure -help all the commands i wanted. Sadly i get a error:

ERROR: Feature 'alsa' was enabled, but the pre-condition 'config.unix && !config.qnx && libs.alsa' failed.

ERROR: Feature 'gstreamer' was enabled, but the pre-condition 'features.gstreamer_1_0 || features.gstreamer_0_10' failed.

ERROR: Feature 'pulseaudio' was enabled, but the pre-condition 'libs.pulseaudio' failed.

ERROR: Feature 'alsa' was enabled, but the pre-condition 'config.unix && libs.alsa' failed.

ERROR: Feature 'pulseaudio' was enabled, but the pre-condition 'libs.pulseaudio' failed.

ERROR: Feature 'system-ffmpeg' was enabled, but the pre-condition 'libs.ffmpeg && features.system-opus && features.system-webp' failed.

Seems like not everything i wanted got downloaded. What can i do to fix that?

[jsulm]

@Xenoshell That's what @SGaist is trying to tell you: you need to install dev packages for all multimedia components you would like to use with QtMultimedia.

[Xenoshell]

@jsulm yeah ok.. thanks, i am going a little bit mental here. I thought i already installed gstreamer. Thats why i was confused. I think i know now what to do

[jsulm]

@Xenoshell You installed GStreamer but not its development packages (which for example contain the header files). You need to install the dev packages as well.

[Xenoshell]

@jsulm
I installed alsa, dbus, gstreamer, ffmpeg but they still show up as errors. What can i do?

ERROR: Feature 'dbus-linked' was enabled, but the pre-condition 'features.dbus && libs.dbus' failed.

ERROR: Feature 'alsa' was enabled, but the pre-condition 'config.unix && !config.qnx && libs.alsa' failed.

ERROR: Feature 'gstreamer_1_0' was enabled, but the pre-condition 'libs.gstreamer_1_0' failed.

ERROR: Feature 'alsa' was enabled, but the pre-condition 'config.unix && libs.alsa' failed.

ERROR: Feature 'system-ffmpeg' was enabled, but the pre-condition 'libs.ffmpeg && features.system-opus && features.system-webp' failed.

[jsulm]

@Xenoshell What exactly did you install? You need *-dev packages.

[Xenoshell]

@jsulm i didnt found any -dev packages. I just searched google for packages to those features that create errors and installed those but didnt saw any -dev packages

[SGaist]

https://packages.ubuntu.com/artful/libgstreamer1.0-dev

[Xenoshell]

@SGaist ok thanks, i found all -dev packages for all the errors exept ffmpeg and dbus-linked.
./configure output is now:

Note: Also available for Linux: linux-clang linux-icc

Note: Dropped compiler flags '-pthread' when detecting library 'glib'.

Note: Disabling X11 Accessibility Bridge: D-Bus or AT-SPI is missing.

Note: Dropped compiler flags '-pthread' when detecting library 'gstreamer'.

Note: Dropped compiler flags '-pthread' when detecting library 'gstreamer_app'.

ERROR: Feature 'dbus-linked' was enabled, but the pre-condition 'features.dbus && libs.dbus' failed.

ERROR: Feature 'system-ffmpeg' was enabled, but the pre-condition 'libs.ffmpeg && features.system-opus && features.system-webp' failed.

Check config.log for details.

Do i actually need ffmpeg for qtMultimedia? Since it is a videoplayer i guess yes. I think i have to install this from source to and that could be a real pain..

[SGaist]

You can install libavcodec-dev and friends for ffmpeg inclusion.

As for dbus, the dbus dev package.

[jsulm]

@Xenoshell Why do you want to install ffmpeg from source? Install libavcodec-dev package from your Linux distribution.

[Xenoshell]

@SGaist i installed your suggested packages and now output is:

Note: Also available for Linux: linux-clang linux-icc

Note: Dropped compiler flags '-pthread' when detecting library 'glib'.

Note: Disabling X11 Accessibility Bridge: D-Bus or AT-SPI is missing.

Note: Dropped compiler flags '-pthread' when detecting library 'gstreamer'.

Note: Dropped compiler flags '-pthread' when detecting library 'gstreamer_app'.

ERROR: Feature 'system-ffmpeg' was enabled, but the pre-condition 'libs.ffmpeg && features.system-opus && features.system-webp' failed.

@Jsulm i dont want to install ffmpeg from source. I just installed already the package and the error still occurs and i just googled the problem and the solution was to install from source

[SGaist]

Check the logs for the related errors. You can also use the -v option to get a more verbose output of the configuration process.

[Xenoshell]

@SGaist I think i found the relevant piece of information in config.log

looking for library ffmpeg
Trying source 0 (type pkgConfig) of library ffmpeg ...
+ /usr/bin/pkg-config --exists --silence-errors libavcodec libavformat libavutil
pkg-config did not find package.
  => source produced no result.
test config.qtwebengine.libraries.ffmpeg FAILED
executing config test ninja
Building own ninja
test config.qtwebengine.tests.ninja FAILED
looking for library opus
Trying source 0 (type pkgConfig) of library opus ...
+ /usr/bin/pkg-config --exists --silence-errors opus
pkg-config did not find package.
  => source produced no result.
test config.qtwebengine.libraries.opus FAILED
executing config test re2
+ cd /home/blz/Downloads/qt-everywhere-opensource-src-5.9.3/config.tests/re2 && /home/blz/Downloads/qt-everywhere-opensource-src-5.9.3/qtbase/bin/qmake "CONFIG -= qt debug_and_release app_bundle lib_bundle" "CONFIG += shared use_gold_linker warn_off console single_arch" /home/blz/Downloads/qt-everywhere-opensource-src-5.9.3/qtwebengine/config.tests/re2
+ cd /home/blz/Downloads/qt-everywhere-opensource-src-5.9.3/config.tests/re2 && MAKEFLAGS= /usr/bin/make clean && MAKEFLAGS= /usr/bin/make
> rm -f re2.o
> rm -f *~ core *.core
> g++ -c -pipe -O2 -std=gnu++11 -w -fPIC  -I/home/blz/Downloads/qt-everywhere-opensource-src-5.9.3/qtwebengine/config.tests/re2 -I. -I/home/blz/Downloads/qt-everywhere-opensource-src-5.9.3/qtbase/mkspecs/linux-g++ -o re2.o /home/blz/Downloads/qt-everywhere-opensource-src-5.9.3/qtwebengine/config.tests/re2/re2.cpp
> /home/blz/Downloads/qt-everywhere-opensource-src-5.9.3/qtwebengine/config.tests/re2/re2.cpp:29:21: fatal error: re2/re2.h: No such file or directory
> compilation terminated.
> Makefile:1021: recipe for target 're2.o' failed
> make: *** [re2.o] Error 1
test config.qtwebengine.tests.re2 FAILED
looking for library webp
Trying source 0 (type pkgConfig) of library webp ...
+ /usr/bin/pkg-config --exists --silence-errors libwebp libwebpdemux
pkg-config did not find package.
  => source produced no result.
test config.qtwebengine.libraries.webp FAILED

[SGaist]

Install the libavformat and libavutil dev packages. Same goes for opus.

[Xenoshell]

@SGaist no error anymore. Thanks for you help. I am gonna mark this solved after i ran make and make install

[Xenoshell]

@SGaist
Oh well, here are some errors.. Should i be worried or not?

/usr/lib/gcc/arm-linux-gnueabihf/5/../../../arm-linux-gnueabihf/crt1.o(.text+0x28): error: undefined reference to 'main'
collect2: error: ld returned 1 exit status
Makefile:81: recipe for target 'schema' failed
make[4]: *** [schema] Error 1
make[4]: Leaving directory '/home/blz/Downloads/qt-everywhere-opensource-src-5.9.3/qtxmlpatterns/examples/xmlpatterns/schema'
Makefile:122: recipe for target 'sub-schema-make_first' failed
make[3]: *** [sub-schema-make_first] Error 2
make[3]: Leaving directory '/home/blz/Downloads/qt-everywhere-opensource-src-5.9.3/qtxmlpatterns/examples/xmlpatterns'
Makefile:44: recipe for target 'sub-xmlpatterns-make_first' failed
make[2]: *** [sub-xmlpatterns-make_first] Error 2
make[2]: Leaving directory '/home/blz/Downloads/qt-everywhere-opensource-src-5.9.3/qtxmlpatterns/examples'
Makefile:97: recipe for target 'sub-examples-make_first' failed
make[1]: *** [sub-examples-make_first] Error 2
make[1]: Leaving directory '/home/blz/Downloads/qt-everywhere-opensource-src-5.9.3/qtxmlpatterns'
Makefile:282: recipe for target 'module-qtxmlpatterns-make_first' failed
make: *** [module-qtxmlpatterns-make_first] Error 2

I am gonna not use make install just yet, because errors and wait for your answer.

[JonB]

@Xenoshell
Just to let you know: I am the person who tried to help with your original "why I am unable to use the camera without freezing?" question!

I see this thread is getting long, I do hope my advice to sort out your multimedia installation fully is worth it for all this compiling etc. you're doing, and not a red-herring...!!