Currently Being ModeratedJun 1, 2011 11:54 AM (in response to pnewelljr)
You are exactly right about the cause of the problem. I was trying to do the exact same thing, and wrote a reply in this post:
While some have suggested to use Audio Routing apps like Soundflower or JackOSX, they don't work in this situation because the Macbook is still sensing the TV's "2-channel only capacity" and now allowing you to send multichannel sound through the TV's passthrough.
Some people would say... why don't you connect your HDMI directly to the surround receiver and then pass the video through to the TV... well, my setup isn't capable of that. My TV has an optical audio out which outputs the digital audio out based on which TV source I've selected. That's makes a lot sense.
How does the Macbook negotiate what output formats are available? Using some drivers for the Intel® High Definition Audio car, or somewhere in the OSX software as it interprets the EDID data.
Where can I intercept the EDID data?
Or, does it not use the EDID information and instead sense it this way... I found this PDF about the audio card ....
apparently tries to "sense" the number of channels the HDMI destination widget is capable of handling. In section "220.127.116.11 Audio Widget Capabilities" it describes some auto-sensing stuff.
SOMEONE has gotta know about this problem. I can force multichannel output to my TV using a PC, why not a MAC?
Currently Being ModeratedJan 16, 2013 9:53 PM (in response to configment)
Did you ever find a solution for this problem? I'm now in the same boat, trying to output 5.1 Surround sound to a Denon receiver via an HDMI Audio De-Embedder. Works great in Windows 7; it's stereo-only on the MacBook Pro :-(
Currently Being ModeratedNov 26, 2013 9:12 PM (in response to pnewelljr)
I am in the same boat. Over the last year, I've been working with Apple Tech Support and have placed several trouble "tickets" with them - no success. I think it's a terrible design to force a configuration and degrade capability when it is not necessary. So, I'm stuck with stereo when the system is fully capable of 7.1. Awesome. I keep hoping something that is way smarter than I am who can figure out a work around.
Hope to keep the topic alive.
I discovered the extent of shame ....... Apple
the choice between an external interface that nobody have of 5.1 on the optical output or
the content of a PLII
because it is what it is in stereo mapping PLII as then Lazer disk, S-VHS, HI8 1990
help please !!!!
Currently Being ModeratedDec 14, 2013 1:24 PM (in response to John Lockwood)
This worked for me: Re: Outputting 5.1 Channel Surround Sound from your Mac