Forcing 5.1 audio output (HDMI to SPDIF Passthrough)

Fishwithadeagle

Honorable
Nov 30, 2012
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Long story short, I have bought a new insignia tv that has an spdif output on it. I connected this to my computer, and the spdif to a 5.1 stereo. Even when the tv is set to have a raw output of the audio signal coming from the hdmi, windows still only allows me to select the tv audio (going to the tv through hdmi) as a two channel system, even though the tv's speakers are also shut off. In this case, is it possible to force windows to output 5.1 audio to what it thinks is a 2 channel receiver. It will pass the surround sound through to the stereo (tested with other game consoles and what not) but I can't seem to get windows to output the full 5.1.

If anyone has any knowledge on this, it would be helpful because it is irritating that I have nearly the perfect setup, except for the true 5.1 I am trying to get out of the computer. Secondly, I don't want to run the spdif directly to the computer because I have the two connected through a thirty foot (powered) hdmi cord, and thus don't want to run any additional wires between the two.
 
Solution


S/PDIF supports only the following formats:

Up to two channels of PCM (Mono and Stereo) at 48Khz/20bps (Windows doesn't support 20bps, so 16bps is the practical limit)

AC3 (Dolby Digital) and DTS up to 640kbps. Higher bitrate codecs such as Dolby Digital Plus, Dolby TrueHD, and DTS-HD Master Audio are not supported over S/PDIF

More than two channels of PCM cannot be output over S/PDIF, which means that native 5.1 is out of the question. Instead, you must use a real time AC3 or DTS encoder which requires a supporting sound card. Many Creative Labs sound cards support Dolby Digital Live and DTS connect with no additional purchase, but many other sound codecs require the software to be purchased.

Instead, you should connect your PC to your receiver through your graphics card's HDMI port and use the HDMI's audio device as the target. Unlike S/PDIF, HDMI can carry up to 8 channels of PCM at 192Khz/24bps.
 
Solution