Detect if video has no audio in C++, preferable using Qt Phonon

Question

I am creating a video player if Phonon and Qt. everything is working fine, but when I have a video in my playlist that does not have audio I wish to play another audio. how can I do that? I mean, how can I detect that the video has no audio?

EDIT: By no audio I meant "no audio channel"

Answer 1

Qt 5 might help you out. Check out Phonon::Gstreamer::MediaObject. The API is similar to the ordinary MediaObject, but with some additional functions. The one you want is audioAvailable().