Settings for iMac Intel i7 - 3,8 Ghz - 128 GB RAM - AMD Radeon Pro 5500 XT 8GB

[informixx]

I want to record Videos in 4K in OBS Studio Release 28.1.2 (64bit)

Base screen 3840 x 2160
Output 3840 x 2160
FPS frames are set on 60 FPS

Recording settings are set on USERDEFINED OUTPUT

Container Format: Standard

Videobitrate 64000 Kbps

Keyframeintervall 2

Audiobitrate 160 Kps

I do use a second 4K Screen where OBS Studio is placed and I record on the screen of the 27" iMac

Actually audio and video are not syncron after few minutes and the cooler fan of the iMac starts nearly immediatly, which is very deplaced noise in audio recodings.

Can I achieve better results with different settings?
What's wrong and what recommendation can be given if I want to record a Mac environment and use two screens while recoding?

Thank you very much!

Hardware Settings:
iMac Retina 5K 27", 2020
3,8 Ghz 8-Core Intel Core i7
128 GB 2667 DDR4
AMD Radeon Pro 5500 XT 8 GB

 

[informixx]

The CPU load during the recording looks like followed.

 

[informixx]

The noise of a CPU cooler in the backround can be easily eliminated while using a noise filter during the recording session.
The result is brilliant, no noise anymore.

A german tutorial video how to install such a filter and how to configure (recommendation good quality, more load on CPU) can be found here
https://www.youtube.com/watch?v=EZJ-T3O3Zkg

It's great that these filters are part of OBS Studio, due to the fact that lot's of external filters are limited to Windows users, so that Mac Users can not profit

 

[informixx]

To get audio syncron with video I need to adjust a delay for the mic.
I recommend to use steps of 50ms for delay time and do test recordings to find the best result.
So you first have to find out if audio or video needs a delay, than ad it like shown in the screenshot.