Why Not Show Dxv Codec After Effect CC 2019 or 2020

i am facing problem in Adobe After Effect(2020) when i export any video file format then not show DXV Codec....Whats This problem..please Specify me...I Installed QuickTime Player Version 10.5 and my Currently Installed Mac OS Catalina....But Before Not Update Then Install Mac OS High Sierra and Install Adobe After Effect(2017) then Export Any File Format Then Show DXV Codec....Whats This Problem...Please Solve This Problem As Soon As Possible..