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Detect if video has no sound in C ++, it is preferable to use Qt Phonon

I am creating a video player if Phonon and Qt. everything works fine, but when I have a video in my playlist that has no sound, I want to play another sound. How should I do it? I mean, how can I detect that the video has no sound?

EDIT: Without sound, I meant "no audio channel"

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Qt 5 can help you. Check out Phonon :: Gstreamer :: MediaObject . The API is similar to a regular MediaObject, but with some additional features. You want to audioAvailable().

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