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Knowledgeable user seeks expert audio help with frequent sound loss
Here's my issue: Most of the time, I'm getting no sound from one particular audio path on my 64-bit Windows 7 Pro system. It's a fairly complex setup, but I've been an computer audio guy since the 80's, yet every attempt at a solution has failed anyway.
Here's the setup for the path in question: Nvidia GeForce GTX 750 HDMI inside Win 7 box => HDMI Splitter that definitely ignores HDCP (1)=> Yamaha receiver HDMI In // (2)=> Direct to HDTV HDMI In.
(FYI: On another path there's an external USB sound "box", which takes S/PDIF input from an HDMI Audio Extractor which takes input from a Gen 2 Fire TV. The USB audio box outputs the RiffTrax audio from a JtJ track which is output from a MEmu emulator running the RiffTrax app).
Problem: Video shows up fine on HDTV, but no audio is heard from receiver. -- UNLESS: Roughly 25% of the time, if I remove everything else from the path in question and connect the nVidia HDMI output directly to the receiver (i.e., no splitter) and reboot, the audio will work correctly, even once I re-insert the splitter and return to the original config. It will remain working for another couple of reboots. but then it will stop working again.
I've tried changing every single cable in the path, and replacing the HDMI splitter with one that also ignores HDCP. I also tried disconnecting the USB sound box. The only thing that works -- and that only 25% of the time -- is to remove the splitter. I realize that sounds like an intermittent or otherwise bad splitter or cable, but recall that changing them doesn't solve the problem.
Here's the only kind of thing I can imagine that would be useful: Identify the Windows-internal audio settings, wherever they may be, save the data to disk, and then be able to restore it on demand. I realize that's absurdly difficult, but you never know. Also, you may see alternative workarounds that I haven't seen.
Thank for thinking about it!