Problem with Qt Multimedia

6EQUJ5

@SGaist I did that and the same error happens.

SGaist

Can you play that file with the gstreamer tools directly ?

6EQUJ5

@SGaist How would I do that?

SGaist

gst-play-1.0 your_video_file

6EQUJ5

@SGaist The command doesn't exist. Even though I installed libgstreamer1.0-dev.

SGaist

That's the development package to be able to use the library in your own projects. You need to install the GStreamer tools.

6EQUJ5

@SGaist What package do I need to install for the GStreamer tools?

SGaist

Please learn to use the tools from your distribution apt-cache search gstreamer | grep tools.

6EQUJ5

@SGaist I installed all the packages that came up with that command. gst-play-1.0 still doesn't work.

SGaist

What doesn't work ?

You can't read the file using the command ?

6EQUJ5

@SGaist The command still doesn't exist according to the terminal even with sudo.

SGaist

Seriously, did you even try to search where that file could be found ?

In this case it's the package gstreamer1.0-plugins-base-apps and the tools package is a dependency of that one.

6EQUJ5

@SGaist I'm sorry. I may be at least an amateur programmer, but I'm definitely not a Linux expert, so I lack knowledge. I tried googling to get gst-play-1.0 to work but came up with nothing.

Installing gstreamer1.0-plugins-base-apps allowed me to use the gst-play-1.0 command. But, when I try to play a video file (MP4) the same thing happens! I get logged out!

SGaist

Then you have determined that it's not a Qt problem. There's something fishy going on with your machine.

6EQUJ5

@SGaist It works fine in Windows 10 though. What could possibly be wrong with Debian Linux?

SGaist

You are comparing apple to oranges. Both are completely different OSs with completely different multimedia backends.

I don't know what is going on with your Debian but you sure have something either misconfigured or buggy. However, it's not something Qt related. You should check with the Debian folks.

jsulm

@6EQUJ5 I would guess bad graphics driver.
You could check the output of dmesg command. In general you should ask this question in a Debian forum or mailing list and attach information about your system (especially graphics hardware).

6EQUJ5

@SGaist I will do that.

@jsulm The output of sudo dmesg is here: https://pastebin.com/VY243fPh

Also, I will ask for help on Debian mailing list/forum with the output.

SGaist

Compare it with the output of dmesg after you got kicked of your session.

6EQUJ5

@SGaist New output (after getting logged out): https://pastebin.com/yJK4tFeQ

Output of diff dmesgOutputBeforeLogout.txt dmesgOutputAfterLogout.txt: https://pastebin.com/5jGtEiUd (differences between two outputs)