Play a video on qt 5.12 c++

AliM93

Hello everybody :)
I'm trying to play a video in my c++ GUI, i found that i need to include in my scripts QMediaplayer and QVideoWidgets, but I got the error 'no such file or directory' .

I'm using Qt creator 4.9.2 Based on Qt 5.12.4, running on ubuntu 18.04.
How can i install them?

thanks
good day everyone

jsulm

@AliM93 Did you add

QT += multimedia

to your pro file (see https://doc.qt.io/qt-5/qmediaplayer.html)?

AliM93

@jsulm i'm using a cmake file,, not qmake, so i don't have the .pro file. I've tried to add in my cmake script these lines:

find_package(Qt5 COMPONENTS Core Gui Widgets PrintSupport Sql Multimedia)

target_link_libraries(agree_gui ${QT_LIBRARIES} ${catkin_LIBRARIES}
(
Qt5::Multimedia
)

but i got this error:
:-1: error: cannot find -lQt5::Multimedia

jsulm

@AliM93 How was Qt installed?

AliM93

@jsulm from the terminal

jsulm

@AliM93 said in Play a video on qt 5.12 c++:

from the terminal

This doesn't tell much.
Did you use apt to install Qt packages from Ubuntu? If so, did you install libqt5multimedia package?

AliM93

This post is deleted!

AliM93

in the qt lib i have these libraries : the path is : QtCreator/latest/lib/Qt

libQt5Multimedia.so.5
libQt5Multimedia.so.5.12
libQt5Multimedia.so.5.12.4
libQt5MultimediaGstTools.so.5 (.12 .12.4)
libQt5MultimediaQuick.so.5 (.12 .12.4)
libQt5MultimediaWidgets.so.5 (.12 .12.4)

SGaist

Hi,

You did not answer @jsulm's question: how exactly did you install Qt ? Using the Qt Online Installer ? Using your distribution package manager ?

Also how did you install Qt Creator ?

If you installed Qt using the package manager, you have to install the corresponding development packages.

jsulm

@AliM93 said in Play a video on qt 5.12 c++:

QtCreator/latest/lib/Qt

This looks like the installation directory of QtCreator which doesn't matter.
Again: how exactly did you install Qt? Did you install Qt packages provided by your distribution (via apt)?
Please answer the questions else nobody will be able to help you.

Pablo J. Rogina

@AliM93 said in Play a video on qt 5.12 c++:

:-1: error: cannot find -lQt5::Multimedia

I guess you may need to try a different name for the library...

target_link_libraries(agree_gui ${QT_LIBRARIES} ${catkin_LIBRARIES}
(
Qt5Multimedia
)

AliM93

@Pablo-J-Rogina i've tried but same error.

AliM93

@jsulm https://ros-qtc-plugin.readthedocs.io/en/latest/_source/How-to-Install-Users.html
i used this link because i need also to install the ros plugin. i followed the bionic online installer

jsulm

@AliM93 That link describes how to install QtCreator (not Qt) and a QtCreator plug-in. So, my question is still not answered...

AliM93

@jsulm i used this and only this one so maybe i did not install Qt

SGaist

Then it's not a maybe, you just have installed Qt Creator.

In any case, are you trying to build a Qt application for ROS or just a Qt application ?

AliM93

@SGaist i''m trying to build a qt application for ROS

SGaist

Then install Qt.

Where did you get Qt Creator from ?

AliM93

@SGaist I got it from the link that i posted. I follow that link and then i installed qt creator with the ROS plugin.
How can i install qt?

I noticed that in my Qt creator folder i have also this path:
QtCreator -> latest -> lib -> Qt --> (...)
may this mean i have also installed Qt? The code i wrote since now works well. is it possible that i installed only Qt Creator without Qt?

Sorry for my bad installation skills.
thank you all.

jsulm

@AliM93 said in Play a video on qt 5.12 c++:

QtCreator -> latest -> lib -> Qt --> (...)
may this mean i have also installed Qt?

No, these are Qt libraries used by QtCreator (QtCreator is a Qt application).
"is it possible that i installed only Qt Creator without Qt?" - I think so, as the link you posted only talks about QtCreator installation.

"How can i install qt?" - you can use Qt Online Installer (from official Qt web site). On Linux you can install Qt packages provided by the Linux distribution.