Unable to use Qt Multimedia in Qt 5.6.3 on Ubuntu 20.04.6 LTS: "No service found for - org.qt-project.qt.mediaplayer"

Animesh452

I'm new to Qt, and I'm currently using version 5.6.3 on Ubuntu 20.04.6 LTS. Due to reasons, I cannot upgrade to a newer version of Qt. I'm building a video player and trying to use the Qt Multimedia module, but I'm encountering the following error:

defaultServiceProvider::requestService(): no service found for - "org.qt-project.qt.mediaplayer"

I am trying to run the following code:

import QtQuick 2.5
import QtMultimedia 5.6
import QtQuick.Controls 2.0

ApplicationWindow {
    visible: true
    width: 640
    height: 480
    title: "Video Player"

    MediaPlayer {
        id: mediaPlayer
        source: "file:///path/to/your/video.mp4"
        autoPlay: false
    }

    VideoOutput {
        id: videoOutput
        anchors.fill: parent
        source: mediaPlayer
        fillMode: VideoOutput.PreserveAspectFit
    }

    Slider {
        id: slider
        width: parent.width
        maximumValue: mediaPlayer.duration
        value: mediaPlayer.position
        onValueChanged: {
            if (!slider.isPressed) {
                return;
            }
            mediaPlayer.position = slider.value;
        }
    }

    Row {
        id: controls
        anchors.bottom: parent.bottom
        spacing: 10
        Button {
            id: playButton
            text: mediaPlayer.playbackState === MediaPlayer.PlayingState ? "Pause" : "Play"
            onClicked: {
                if (mediaPlayer.playbackState === MediaPlayer.PlayingState) {
                    mediaPlayer.pause();
                } else {
                    mediaPlayer.play();
                }
            }
        }
        Button {
            text: "Stop"
            onClicked: mediaPlayer.stop()
        }
    }
}

I've tried several things to resolve this issue:

I checked the output of ldd libgstmediaplayer.so and found that the system is unable to find the GStreamer 0.10 libraries. However, I have GStreamer 1.x installed on my system, as confirmed by the output of gst-inspect-1.0.

I tried to install GStreamer 0.10 using the following command, but the packages were not found: sudo apt-get install libgstreamer0.10-dev libgstreamer-plugins-base0.10-dev

I attempted to rebuild Qt 5.6 with GStreamer 1.x support. I downloaded the Qt 5.6 source code, installed the necessary dependencies, set the PKG_CONFIG_PATH environment variable, and ran the configure script with the -gstreamer 1.0 option. However, I encountered an error saying that /home/user/qt-everywhere-opensource-src-5.6.3/qtbase/configure was not found.

I'm at a loss for what to do next. Any help would be greatly appreciated.

SGaist

Hi,

You should start with a fresh source tree. If configure is not there then there's an issue with.

I would also recommend using an out of source build so if something goes wrong you can just start from fresh more easily.

Animesh452

@SGaist Umm I am a beginner and am not exactly sure what you want me to do. From what I understand, a fresh source tree is making a new project. And I haven't done anything related to out of source builds. So, would you please elaborate?

SGaist

I meant with regards to your build of Qt 5.6. Grab the sources anew and redo the build steps from a freshly decompressed source tree.

Animesh452

@SGaist Hey, I tried this, but it didn't work. Some of my colleagues mentioned it is a license problem. So, is that true?

Also, I tried this in Windows using the 5.6.3 MinGW build, and it worked fine. I am guessing the best way would be to upgrade the Qt version for Ubuntu, or is there any other way I can try?

SGaist

There's no particular license required to use the QtMultimedia module. It's likely a detection issue at configuration time. Do you have the GStreamer development packages installed ?

Animesh452

@SGaist I have gstreamer 1.x but from what I found, qt 5.6 requires 0.1 which has become obsolete for linux 20.04. I tried installing it using deb package but encountered a couple of errors.

SGaist

One possible alternative could be to use a Docker container to build your application with a suitably old Ubuntu or maybe a VM which would be even simpler,