Artefacts + distorted frames at 8K (MAGIX HEVC) Vegas 21

GamingRevenant wrote on 9/11/2023, 11:21 AM

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.

Comments

3POINT wrote on 9/11/2023, 2:39 PM

You found already the solution to your problem. Use Voukoder, with HEVC NVENC support it renders faster than Magix.

GamingRevenant wrote on 9/11/2023, 3:21 PM

You found already the solution to your problem. Use Voukoder, with HEVC NVENC support it renders faster than Magix.

Thanks. I actually didn't see it had a dropdown selection for different codecs to use (I assumed it automatically selected the best options of all the available encoders based on your system). By tweaking the various settings as desired it now works as it should, and goes equally fast.

It's just that your help could literally have worked without a straight-up insult. In an effort to answer to your first reply anyway, 623k people watch the trash footage I record, edit, and upload for over 13 years.

I do appreciate the help as I can finally move forward. Marked as solution for those who run into the same problem.

mark-y wrote on 9/11/2023, 4:11 PM

The problem with uploading 8k 60p to Youtube is that most people don't have the internet bandwidth nor the equipment to stream or play them locally.

In the meantime, Youtube has downprocessed your 8k to 4k and HD1080 versions, which most people 'can' play, but the quality may have been turned to mush by Youtube's conversion.

One suggestion is to encode and upload for the majority of your viewing audience, not the 1% with expen$ive equipment. If you've caught the modest user's attention, you've got the whole room.

Former user wrote on 9/11/2023, 5:48 PM
 

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).

You worked out your problem , you were not using HEVC NVENC (via voukoder), the reason VLC would have played it back poorly is because resolutions above 4K for AVC are not 'legal' so hardware does not support it via encoding or decoding. You have to use HEVC as you're doing now.

In the meantime, Youtube has downprocessed your 8k to 4k and HD1080 versions, which most people 'can' play, but the quality may have been turned to mush by Youtube's conversion.

That's what customers complaint is about. Vegas's trash hardware encoder that they won't fix, Youtube didn't do that, if you're talking about his test file that he linked to. Also 8K is like HDR, it can take 1 - 3 days to process on YT.