It should work on every Kodi installation.
With a normal USB keyboard connected, try pressing CTRL-SHIFT-O.
The codec info is shown using only the letter 'o'.
Thanks! After this comment I tried another USB keyboard and then it worked.
I'm an idiot and should have tried that some more before posting
Was also a little confused by the fact that you can not activate CTRL-SHIFT-O after 'o' but you can activate 'o' after CTRL-SHIFT-O.
Anyway, I built and tested the new json command for 'Player Process Info' if someone comes here searching for it:
This works in 18.9:
jsonrpc?request={"jsonrpc":"2.0","method":"Input.ShowPlayerProcessInfo","id":1}
But have so far been unsuccessful in building the 'Show codec' command, equiv of CTRL-SHIFT-O.
It is not:
jsonrpc?request={"jsonrpc":"2.0","method":"Input.ShowCodec","id":1} as I would perhaps expected
Have also tried sending the key command over JSON but no luck so far.
Any chance of a hint on what the new JSON command is for that particular function should be in Leia?
Many thanks again!