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Hi i got a Radeon 6990 with an Marantz 6010 try it with CCCP Codec Pack then only play the files with MPC HC and dont forget to to make right click on the movie when you started playing it then go -> Filters -> LAV Audio Decoder and check everything under Bitstreaming. Now it should work, The samples work on my Marantz it shows Dolby Atmos under signal and it just sounds awesome. Hope that helps.
Did you install the Realtek HDMI Audio Driver correctly ?
Be sure to download the
ATI HDMI Audio Device R2.70
Thanks, I got to work with MPC HC, I got he same advice on the AVC Forum. :-)