I found a simple media player on github : https://github.com/wxWidgets/wxWidgets/blob/master/samples/mediaplayer/mediaplayer.cpp
I copied it in a new project and ran it. It seemed to go well until I tried to open a .mp3 file. I got this error: "Media Playback error. Could not initialize Xv output".
I work on Ubuntu in a virtual machine so I thought that maybe I'm missing something. I opened Rhythmbox and tried to play the same file and I got the same error. I searched on google and found this:
https://askubuntu.com/questions/750418/my-rhythmbox-not-playing-mp3
I installed gstreamer plugins-ugly and plugins-bad, ubuntu-restricted-extra. Also, I installed libxv-dev because I thought it may have something to do with all of this. It didn't work. I reinstalled Rhythmbox and it works just fine now. I thought I had solved the problem I had with the code (mediaplayer) as well but I didn't. I still get the same error.
How can i make it work? And why do I get this error in the first place?
I forgot to mention. I'm also getting these messages :