QMediaPlayer supported mime types

Hi, I've started to use the QMediaPlayer class on Qt 5.2.1 and I believe there are a few things missing.
If I call QMediaPlayer::supportedMimeTypes() I get an empty QStringList. (tried on Linux and Windows)
The documentation says it's a deprecated API but it doesn't say which one to use.
My guess is that the only way right now is using "hasSupport", but I don't understand the convenience of it.

Should an application guess all the audio/video mime types in the world and tries all the combinations with all the existing audio/video codecs ?
Sounds like a very uncomfortable way to retrieve information that the default audio/video provider can clearly provide (gstreamer, directshow, etc..) in a better way.

Is there a way to retrieve a straight mime types list without doing a non-sense blind shooting ?

Thanks