[Solved] QMediaPlayer reporting no service available in latest Qt update
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It was not what I had in mind, just to determine if it was a Distro vs User install. However, it would indeed be useful to know what has changed between both version to help determine why it's falling now.
AFAIK, gstreamer is the official multimedia backend on linux. If someone has a VLC version, it has not been submitted yet.
As a user of a distro Qt install, the checks should have been done for you. What might happen is that you have some leftovers, did you do a complete clean build ?
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The next thing to do is check that you have all Qt plugins installed and that the multimedia plugin gets loaded
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Everything worked just prior to the last Qt update. I shutdown all running programs, including Qt Creator, ran the update, brought up Qt Creator, recompiled the project and ran it. This resulted in the reported error.
I suspect the plugin may not have loaded, but what is the best way to check? I couldn't find anything in the documentation indicating how to check for this, aside from the call to isAvailable(), which I do make and now returns false.
I could change the call to, isVideoAvailable(), since that is what I want to do with the QMediaPlayer, but the error stated in the first message has already indicated that I shouldn't expect it to work and it did report "no service found".
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To check which plugin is load set QT_DEBUG_PLUGINS=1
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Setting the environment variable told me where it was looking. I cannot say what was there before the update, but it appears that the gstreamer plugins are not present in any of the /usr/lib/qt/plugins subdirectories. None of the names indicate they might be part of gstreamer. All gstreamer components are installed on the system. Aside from mng, I do not see any plugins related to video. Though the error is produced prior to selecting any video or even creating a VideoWidget. The only plugin in the mediaservice directory is libqtmedia_audioengine.so.
It is looking in the mediaservice directory when it fails. The message reported is exactly what was originally given,
defaultServiceProvider::requestService(): no service found for – “org.qt-project.qt.mediaplayer”
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From what it looks the update failed somehow
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Can you look into the packages content ?
Check if the multimedia package contains all plugins and compare with the previous version ?
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I have contacted the maintainer of the package. They have verified the issue and submitted a correction. The latest update in Arch has fixed the issue. Something to do with the support being in QtWebKit, not in QtMultimedia. Personally, I would have expected to find it in multimedia as well.
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QtWebKit needs some multimedia stuff, but indeed, it should depend on QtMultimedia in that case and not the reverse
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Distro packagers have been known to move things around. For example, Ubuntu moved Qt Multimedia into Qt Mobility back in the Qt 4 days.
