videoscale: Negotiation fixes for fixed PAR
This is a set of fixes with the ultimate goal that scaling width=854,height=480,pixel-aspect-ratio=1/1
into width=[16,512,2],height=[16,512,2],pixel-aspect-ratio=1/1
works, without adding borders or distorting the image too much.
Depends on gstreamer!67 (merged).
Edited by Jan Alexander Steffens