iTunes 12 sound does not work with ac3 passthrough

I have an Intel DX79/Xeon 2, CPU 0GHa with a NVidia GTX680 graphics card.

I use an HDMI output directly to a Denon surround amplifier. Everything had been working well for a few years but recently I reinstalled Windows 8.1 and I found the passage of in surround AC3 stopped working with iTunes.  Movies of the source that I use have 5.1 channels and used to work.  Nothing the silence I fear when "Prefer AC3" is now selected.   The material has not changed - just a re-installation of Windows with the latest version of iTunes 8.1 and NVidia version 359.06.  The installation is completely vanilla flavored outside these two packages being installed.

So, I added PowerDVD and tested with a couple of BluRay discs.

PowerDVD works well with AC3 pass by - the problem seems to be limited to iTunes.  Stereo mode in iTunes works fine.  I tried the "Old video card" version iTunes without success and I tried without downgrading the video version card / audio driver for NVidia 344.75 (a version I know that used to work for about a year back) all to nothing does not).  I also tried version 12 iTunes and encountered exactly the same problem. I think that maybe iTunes and the driver NVidia do not play well together.  All the world is this problem?  I tried to contact Apple support, but it generates an error with a hexadecimal error code large enough and said "try again later...". ', Useful suggestions are welcome!

Hey there,

I just saw your post - I had the same problem and posted my fixed on a different thread, here: AC3 Passthrough works does not in 10 - bug and workaround windows

I hope this works for you

Tags: iTunes

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