DD passthrough on phono out?

[Skywatch]

Yes it would be fantastic. ;-)

The plan is needed as the amps and projector don't have HDMI inputs (too old) and I can't afford new ones.

So, I have a HDMI to VGA + Audio splitter to get sound into the system and VGA to the projector. This also gives me better quality audio as the phono out on the pi is not so good quality. So far so good.

But, I can't get DD this way as the audio from the converter has to be connected to the analogue inputs on the amp. If HDMI DD passthrough worked I would still have to unplug the cables from the amp and reconnect them to the DD decoder box each time I wanted to go from film to music. This is not an attractive option! Nor, it seems is a USB DAC a viable solution. :-(

So I was hoping to leave the HDMI audio as stereo analogue and use the phono ouput to connect to the DD decoder and just use the remote to switch between the two. But as Rikardo pointed out this won't work.

I am now wondering if there is another way, maybe I could use a small relay board connected to the pi gpio and have that switch the HDMI out to phono or DD inputs on the amp/decoder. I don't know if the HDMI splitter will allow passthrough of DD. How would I test this?

With the above there is the danger of 'poping' on the audio when the relays operate, but if I ever get the IR control working as well I could mute the amp, then switch, then unmute the amp. But I am months away from getting near to that.

Cheers,

Skywatch.