Question / Help iMac Crashing while live-streaming

[mikedeez]

Hi. I'm trying to figure out a crash problem I'm having with my iMac. While live-streaming with OBS the computer will totally crash so there's no crash report. I will list the log files below. The crashes only happen while live streaming. Naturally I've tried to do several test streams but they aren't crashing so I can't track where the problem is coming from. Processor usage maximum 60% while in full production.

Programs I'm using:

OBS 25.0.8. (live streaming and video/audio mixing)
Propresenter 7 (Videos and Lower Thirds Titles through syphon to OBS)
Chrome -Version 81.0.4044.138 (Official Build) (64-bit). (Watching live stream status through restream.io)



My Equipment is listed below:

iMac (Retina 5K, 27-inch, Late 2015) Mac OS Catalina Version 10.15.4
Processor: 3.2 GHz Quad-Core Intel Core i5
Memory: 24 GB 1867 MHz DDR3
Drive 1Tb fusion drive
Graphics: AMD Radeon R9 M390 2 GB

PTZ Optics 20x NDI Camera over network into OBS

Behringer FIREPOWER FCA-1616 (audio capture)

Two VGA TV Outputs for monitoring

Logs from OBS (there are three of these since the program crashed twice.)

 

[Meester Roboto]

I have a very similar issue with one minor difference. The issue happens while OSB is open but not streaming/recording in addition to while streaming, however it takes longer to reproduce while not recording/streaming.

The total system crash happens about 10-20 minutes into streaming. Everything freezes (even the mouse!) and then the computer turns off. Sometimes it restarts on its own, sometimes it stays off. It takes about 60+minutes or so of OBS simply being open (not streaming/recording) before the computer crashes in a similar manner.

No decreeable signs of struggle from OSB or the rest of the system prior to crashing.

My iMac is VERY similar.

iMac (27-inch, Late 2013)​

3.4 GHz Intel Core i5​

NVIDIA GeForce GTX 780M 4 GB​

1TB Fusion​

24 GB 1600 MHz DDR3​

 

[Meester Roboto]

I was able to reproduce it and find some lines in the system log in console that might be related?

Jun 25 12:55:49 iMac-2 com.apple.xpc.launchd[1] (com.apple.xpc.launchd.user.domain.501.100007.Aqua): com.apple.ReportCrash (lint): Unrecognized MachService property: DrainMessagesOnCrash
Jun 25 12:55:49 iMac-2 com.apple.xpc.launchd[1] (com.apple.xpc.launchd.user.domain.501.100007.Aqua): com.apple.ReportCrash.Self (lint): Unrecognized MachService property: DrainMessagesOnCrash