Devices > Video Cards, Monitors, Televisions, and Projectors

Need advice on HDMI to PCM decoding

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Bob4K:
Hi,

I am a total newbie here, I never used JRM.

I need to build an HTPC with only one purpose: being able unattended to accept an HDMI signal with any full lossless and lossy audio format (DTSMA, TRUEHD, AC3, AAC, etc...), any video resolution up to 4K/60, and output unchanged video with fully multi-pcm decoded audio.

Is that possible with JRM?

I built numerous PCs, and I have a good Windows knowledge, including building C++ apps.

Thank you in advance for any pointers. Knowing it's possible and where to find the various docs would be a great help.

Awesome Donkey:
Enabling HDMI bitstreaming is probably the best first step to get you going. Some wiki topics can be found at the following links...

https://wiki.jriver.com/index.php/Blu-ray#HD_Audio
https://wiki.jriver.com/index.php/Audio_Connection_Type

dtc:
Bitstreaming will pass the audio exactly as it came in. It seems the goal is to have the audio all converted to PCM without changing the video. For that, I think turning bit streaming off is the right approach. The question then is what audio formats does MC convert to PCM with the same number of output channels while preserving the video format. 

craigmcg:
It sounds like you're trying to use an external device connected by HDMI to send into a pc where Media Center is supposed to pass the video through without change but convert the audio to PCM but is the PC supposed to then feed it to another external device?

Could you please clarify your equipment/signal chain? I think that it might help people to help you better.

Bob4K:
So, I have a Dune Player HDMI output to be split. Its output currently goes to an HDfury Vertex splitter.

The Vertex output 1 goes to a video processor that goes to a projector.

The Vertex output 2 should go to a Goldmund audio processor. That should be simple enough.

But the audio processor is picky. Even though the Vertex shows HDCP 2.2 both on its input and output 2, the Goldmund does not decode DTSMA nor TRUEHD.

My workaround is to plug the Vertex output 2 to an Oppo 203 HDMI input, and then the Oppo audio only output to the Goldmund.

Somehow, the Goldmund "likes" what the Oppo outputs, and it decodes.

It works, but the chain is complicated, and I have way to often to power ON/OFF the Oppo to make it work, the audio just disconnects sometimes after a pause or a fast forward for example.

My idea is to replace the Vertex by a PC using JRM, using it as a simple splitter with 2 outputs, one video and one audio.

If the audio is PCM instead of bitstream, the Goldmund always work, and I can eliminate the Oppo.

So, I need a PC with an HDMI input, 2 HDMI ouputs, one for video, and one for decoded to PCM audio.

The main difficulty seems to find a GPU with one HDMI input, of course supported by JRM. any idea?

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