Aproximate biterate by codec

[apoklyps3]

Selecting a codec and a resolution+framerate produces the same value for all codecs even though theoretically hevc is 2x more eficient than h264 and av1 is 35% more efiecient than hevc.

how about if an automatic converter for the sugested value is implented to produce the same image quality(theoretically). let's say by default you have 1080p/60 and h264. that gives you a video biterate of 20.

it would be cool if you select another codec to recalculate the default biterate needed to match the same image quality.