ac3 filter for mac?

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I have a movie file in which the audio is in FLAC format. My macbook is linked to my HDTV and 5.1 surround sound system via digital signal.
I use VLC to play this movie file and its plays the video fine and the sound does play, however due to the amp not being able to decode FLAC I think sound was reduced to stereo. Usually the amp would show Dolby D or DTS if the input it received were either one of those, but however nothing showed which is an indication that the audio input is just stereo.
I have read that in windows you can use AC3filter to decode FLAC to either dolby digital or DTS to work with a 5.1 surround sound system. Is there anything like this for mac?
Any help would be appreciated.

Michael.
 
I don't think that codecs are my problem, there isn't a problem playing the movie file or sound, the problem is that the output via optical out cannot be decoded by my amp (only DD 5.1 and DTS, not FLAC), for windows they get around this by use AC3filter to convert FLAC to 5.1/dts on the fly, therefore they get a surround sound output. Just wondering if there is anything like this for mac?
The codecs i have are flip4mac, divx, vlc.
 
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