Question / Help High CPU usage Black Magic Atem Mini

yurkomik

Member
Hi. I use 2 ATEM mini switchers and iMac 2019 with 8 core i9 processor and 64GB of Ram.
Looks like even in the idle mode each ATEM mini webcam source consumes ~ 45% of the core. If I add two sources (MJPEG Webcam) I have ~100% CPU Core usage and 6-7GB of virtual memory use. That's even if current scene is has no webcam source or source is hidden.
I have the same situation on the Streamlabs OBS.
OBS reports 3-5% of CPU usage but cooler works as crazy and system monitor shows high load. I've added integrated iMac camera and lost 81 frames.
I guess that has something to do with the MJPEG video format full HD at 60 frames per second.
Is there any workaround other the using lower frame rates and resolution? Should I expect same CPU load on the windows machine?

LOG FILE: https://obsproject.com/logs/A8J09bEtRkSlI2U7
 

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  • OBS 25.0.7 (mac) - Profile: Untitled - Scenes: test 2020-04-18 12-19-25.jpg
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  • About This Mac 2020-04-18 12-23-51.png
    About This Mac 2020-04-18 12-23-51.png
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faithj

New Member
I've also got high CPU usage compared to 24.x versions. It was usually hovering at 10% and now it's at 50% with the same settings
 

yurkomik

Member
Not sure how it was on 24 but it's getting worse. Can anyone confirm that this is an known issue for MJPEG video sources?
 

yurkomik

Member
Proof that this is OBS issue - wirecast trial version uses 3 times less CPU in the same setup. Fan is quiet.
 

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  • MyDocument 2020-04-19 14-18-24.jpg
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yurkomik

Member
Checked skype webcam stream. It uses CPU around 3 times less then OBS. Can anyone reply if windows will solve the problem? Are there any plans to fix it on mac?
 

yurkomik

Member
Same on streamlabs OBS... Any comments from developers?
 

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  • Streamlabs OBS 2020-04-25 01-36-49.jpg
    Streamlabs OBS 2020-04-25 01-36-49.jpg
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