You need to run "macdepoyqt" in the base directory of your application. (Macdeployqt should either come with qt or can be built.) More specifically, go to the directory where "MyApplication.app" is located, and call "macdeployqt MyApplication.app". This will copy all the necessary Qt frameworks and dylibs into your app folder. This is very important for phonon because the phonon backend needs lots of files and codecs. (Simply copying the phonon.framework and dylibs yourself will not work.)