That diagram is actually wrong - an iPod video does not reverse left and right audio compared to other devices. (The tip is always left audio - and yes, I do still own an iPod video… )
The pinout for the PI-2 was right though since i had rewired a plug with it and it worked fine.
And I’m too old to have ever owned an IPOD so I wasn’t too concerned about it.
I come from an era of thermionic valves.
Yes the pinouts for the Pi were correct but wrong for the iPod - I brought this up because iPod compatible cables are what is recommended for the Pi due to them being wired the same way as the Pi B+ / Pi 2. (In fact from what I’ve read the Pi foundation consciously chose to follow the same wiring standard as the iPod Video when designing the new port in the B+)
Most (but not all) camcoder cables will also work if you swap the red and yellow plugs.
Thank you for the input. What a great community. I never knew that there were different pin out configurations used on mini jacks with video out. All working now. Saved a lot of troubleshooting head-scratching etc! Thanks again