Quicktime does not play audio anymore

Hi everyone.
I'm experiencing this weird problem on every quicktime movie I open, both streaming and saved movies.
Anyone knows how to fix this without reinstalling everything?
Thanx.

Some third party software can change the default settings in the Audio MIDI setup.
Open the app (found in your Utilities folder) and change the audio output settings to 44100Hz and try the file again.

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03 In Dreams.mp3
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Quicktime does not play audio anymore

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