Tue Jan 24, 2023 10:33 am
Quality, and size of your render is very much governed by bit rate, especially h264. Low bitrates will produce that blocking. For UHD(4k) I set a minimum rate of 80Mb/s. I have found h265 produces much better renders.
Do remember that YouTube re-encodes every upload so the higher quality of your original the better. I never worry about file size as it's what the final render looks like on YT that's important to me.
Have a look at the Deliver section of the Reference manual starting on page 3876.
As an example, this is one of my uploads. Shot in HD at 50fps MP4, upscaled to UHD when rendering to h265 in a .mov file with Linear PCM audio. The 11.5 minute video produced a file of 10.8GB.
Resolve Studio 19.0b1 build 20
Dell XPS 8700 i7-4790, 24GB RAM, 2 x Evo 860 SSDs, GTX1060/6GB (551.86 Studio Driver), Win10 Home (22H2), Speed Editor, Faderport mk1, Eizo ColorEdge CS230 + BenQ GW2270 + Samsung SA200, Canon C100mk2, Zoom H2n.