Thanks for clarifying... I have been searching for the "mmap() failed" error in the forum, and I find a lot of suggestions to run hyperion as root.
I will give that a go when I have access to the equipment again today.
I made the changes while I was at home for lunch, and we have success!
first is dtparam=audio=off in config.txt boot section.
Didn't know where to look for this, but I recall checking it when I first set up Hyperion, so I was pretty sure it was set up properly.
if that doesn't work> in terminal of raspi;
sudo systemctl disable --now hyperiond@pi
sudo systemctl enable --now hyperiond@root
sudo reboot now
I had tried that before, with no success. But the note at the end that says:
note: try the codes with and without d at the end> hyperion(d)
That was the key.
From another thread I found this:
ps aux | grep hyperion
I ran this command and was able to see that I had one entry that used hyperiond, and a second that had hyperion.
The commands:
sudo systemctl disable --now hyperion@pi
sudo systemctl enable --now hyperion@root
sudo reboot now
Worked. When Hyperion restarted, I had to go through the full configuration again, telling the program what kind of LEDs I had, the layout, and the type of capture card I had. Immediately the LEDs started flashing colours. I checked the live view, and found the static (snow) showing. I deactivated and reactivated my capture card a couple times, and the LEDs settled down. Checking the live view, I once again had a proper capture image.
I ran the LED channel wizard and found I needed to swap R and G channels.
And that's it... Now I need to mount everything and get it all cleaned up.
My wife has seen all the wires, boxes, and the LED strip scotch taped haphazardly to the TV and is wondering what kind of stupidity I am up to now...
My daughter did a single colour static LED strip on her TV a few years ago, and I suspect that my wife thinks this is the same thing.
Hyperion running the LEDs doesn't look very good with the daylight streaming in the windows, but later this evening, it should look much more impressive.
Thanks for the pointer in the right direction, and the commands required to get hyperion root access.