I've run into a major problem when I started doing renders of 8K UHD resolution. I read on Google's recommended YouTube encoding settings that for 8K 60FPS a bitrate of around 120-240mpbs is advised.
I realised that the first few videos I did where still using the old mbps of my 4K templates, around 50mbps, which is supposedly too low for 8K renders. So I went ahead and changed only this settings to 220mbs and around 200mbps on average. You can check the settings in the images below:
However, every single time I start rendering stuff above 120mbps it introduces distorted images, smeared pixels and artefacts all over the place. The higher the mpbs the worse this becomes. Here's a small example:
When I render below 120mbps (between 90-100mbps) it's all gone, but the final file is also much muddier (in 8K).
How can I get rid of this? I record with NVIDIA Shadowplay at 250mbps with an RTX 4070Ti and the two files used in the project show that they are around 246mpbs. When playing the original recorded files through VLC they play without any problems, buttersmooth and no artefacts of any kind.
I read that using Voukoder, it should work. I tried, and it does get rid of all the artefacts. However, the rendered file has trouble playing through VLC, and most shockingly is also much slower (about 4 to 5 times slower than the HEVC codec). This looks like a drawback to me rather than a solution to the problem.
Does anyone know what's the deal here? I'm completely lost.
Using Vegas 21, all up-to-date.