@mnokka

Are you sure your path is correct? If Qt can't find the file it gives the "error decoding source" message which is misleading.

Add files to your resource file:

(If you haven't already created one go to File | New | Qt | Qt Resource File). Click Add existing files then select sound files you want Right click and copy path Paste path to play filename. e.g. QSound::play(":/lose.wav");