What is Best Color Format for 8mm video capture in OBS
 

Can someone explain whether it is better to record S-video from 8mm tape into OBS using i420 or NV12 color format. These are selectable on the "advanced" settings.

I want to preserve the color info coming from 8mm video thru a BlackMagicDesign Analog to SDI converter.

The S-video into the Analog to SDI converter uses a luminance cable and a single combined chroma cable.