What is the difference between yuvj420p and yuv420p?

[John Matthews]

On the GX80, video is usually recorded in yuv420p, but video shot in stills mode (4k Photo Burst) is yuvj420p. My understanding is yuv420p uses color values from 16-235 whereas yuvj420p uses color values from 0-255. Is that the only difference? Which is technically better for grading in post? And why? A nerdy question for sure, but I bet someone knows the answer here or can point me to a site.

[jcs]

Yes, that's the difference. To be honest it won't really make a difference either way except for some extreme cases (and/or NLE issues which don't handle levels properly). Try it both ways in your NLE to find out.