Standard video often uses 4:2:0 chroma subsampling. Extra Quality productions may utilize or even 4:4:4 (uncompressed chroma). This retains the full color resolution, making text sharper and colors more distinct—a critical factor for US broadcasts that rely on vibrant graphics.
You won't find a button labeled "AV4 US" in Adobe Premiere or DaVinci Resolve. Instead, synthesize the meaning: av4+us+video+extra+quality
You cannot brute-force AV4+US quality on a laptop. The computational cost is immense. Standard video often uses 4:2:0 chroma subsampling