/vr/ - Retro Games

So, if there's one thing that the pastebin should mention along with RGB via SCART is that a displacement to the left is normal and so is that is darker compared to other input types.
I did practical experiments and have my experience with this.

The RGB signal itself appears to be left shifted by ~1µS, meaning that the other signal types are delayed.
The test with my homemade SCART->YUV converter (consists of fast and expensive opamps) plugged into the Composite input showed that the chroma processor (converts input to RGB) causes this delay. Plain TV sets are designed to display analog TV broadcasts which are composite+audio in a RF channel and the picture center is adjusted to show that in the middle.
There are 2 schematics that can change the horizontal center of an RGB signal carried via SCART by extracting the sync of the composite and processing it with precise timing ICs.
http://members.optusnet.com.au/eviltim/shiftysync/shiftysync.png
https://playoffline.wordpress.com/cable/rgbshifter/

I build both of them (along with my improved LM1881 preamp) and i can say that they will work very great with non-interlaced aka 240p/288p.
But they suck when it comes to interlaced video.
I illustrated the issue.
Basically you get a weird looking scanline effect on a big and sharp CRT (small is rather unnoticeable) if you use that shifter on interlaced signal.
I believe the origin of this comes from the way how VSync is handled. A odd field starts with it's VSync aligned to the HSync while the other is in the middle of the scanline. The shifters might start the VSync at the 1/4 and 3/4 of the scanline which might confuse the deflection circuits of my TVs or they are inconsistently delayed from each other.

The industry reacted to this problem:
Certain TV sets have a manual RGB mode which corrects this issue, 6th gen consoles like NGC let you set the horizontal center and some recent DVB receivers delay the RGB signal (both composite and RGB are centered).