Multiple issues with examples

[macermak]

Aight, first part of the problem solved (partially)... It was Wayland causing the black screen, in a moment I switched to X11, it was okay.
But still having troubles with the audio. The 'Audio Visualizer' example neither loads the song, nor plays any sound. Also I can't stop it or pause it.

[jsulm]

@macermak For media like audio you need to install GStreamer libraries.

[macermak]

@jsulm Thank you for your response,
I know, as I mentioned before, I believe I have all of them installed. Both 1 and 0.10.
I found a bug that describes similiar thing on Windows (no solution): https://bugreports.qt.io/browse/QTBUG-58125?jql=text ~ "audio visualizer"

PS: Enclosing output of $rpm -qa | grep gstreamer
[0_1502774628239_output-gstreamer.txt](Uploading 100%)

[jsulm]

@macermak You can try to start the example with QT_DEBUG_PLUGINS set to 1 to see what exactly happens when plug-ins are loaded

[macermak]

@jsulm That is a great advice! At least I can trace it somehow.
I can see an issue:
Cannot load library /home/macermak/Qt/5.9.1/gcc_64/plugins/imageformats/libqjp2.so: (libjasper.so.1: cannot open shared object file: No such file or directory)
QLibraryPrivate::loadPlugin failed on "/home/macermak/Qt/5.9.1/gcc_64/plugins/imageformats/libqjp2.so" : "Cannot load library /home/macermak/Qt/5.9.1/gcc_64/plugins/imageformats/libqjp2.so: (libjasper.so.1: cannot open shared object file: No such file or directory)"

$rpm -q qt5-qtimageformats
qt5-qtimageformats-5.7.1-5.fc26.x86_64
$sudo find / -name libjasper*
/usr/lib64/libjasper.so
/usr/lib64/libjasper.so.4
/usr/lib64/libjasper.so.4.0.0

[jsulm]

@macermak Well, this is JPEG - not related to audio

[macermak]

@jsulm Yes, I agree, but it is the only issue I can see in the debug output. Plus, I don't know how to solve at least this, since there is no libjasper.so.1 in jasper-libs anymore. Any idea?

[jsulm]

@macermak On Ubuntu you need to install libjasper1 package.

[macermak]

@jsulm Yes, but I am on Fedora 26, which is using libjasper.so.4

[jsulm]

@macermak Could be that it provides an older version of the lib as well, or you could try to hack a bit and create a symbolic link:

ln -s libjasper.so.1 libjasper.so.4

:-)
But this will not work if these two versions are not compatible.

[macermak]

@jsulm Thanks, this is kinda brilliant, it did satisfied the debug message! Did not solve the problem with the audio visualizer tho. Should I report it as a bug?

BTW as far as the text to speech example is concerned, I found https://bugreports.qt.io/browse/QTBUG-58461 .. seems like a current problem that is being worked on.

For future reference, if someone wants to fix this as well, the command is vice versa:
$ ln -s libjasper.so.4 libjasper.so.1

[jsulm]

@macermak Yes, symbolic link can be very handy :-)
You can report it as bug but you should first search there - maybe it is already reported.

[macermak]

@jsulm Ye, I found some similar bugs that have already been reported. Lets hope for the fix soon. Thank you for the help anyway.

Mark.