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MP 1,1-5,1 Strange Audio Issue on MP 4,1>5,1 Mojave 10.14.4

pro video formats 2.1 only works in mojave 10.4.3 or later

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I can confirm audio issues with Mojave. Until last week, I have still been using El Capitan and no audio issues prior this update. Interestingly enough, the issues still apply even when using external USB audio interface. So the problem is somewhere deep. Time to throw some upgrade CPU's inside.
 
Just swapped in a pair of X5680s and the audio issue (confirmed present immediately before the upgrade) is completely gone. No surprise there, but it's another data point. On to the next upgrade...
 
Using the command given earlier cleared up the audio playback stuttering in iTunes, but resulted in general performance issues in other areas, most obvious with Youtube video playback.

Probably going to go back to dual CPUs as I can work around or even put up with the slight iTunes stuttering more than the performance/video playback issues.

Intel(R) Xeon(R) CPU X5570 @ 2.93GHz
 
Really do not believe the dual CPU disable command (force single CPU only) is meant to be a long-term fix, just to identify the source of the issue. If budget is an issue, would recommend everyone wait for 10.14.5 public release before abandoning Xeon 55XX-series entirely. As noted in this thread, changing to Xeon 56XX-series does appear to remedy the issue and makes the 4,1>5,1 much closer to Mojave-approved authentic 5,1 hardware.
 
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So, as I mentioned in my previous message, I did the command to go to one CPU, then did the other command to remove that setting and go back to two processors.

There's no more stuttering. I don't know why. No other major changes I can think of. No OS update. Even doing things like rapidly tabbing through open applications, which reliably caused stuttering before, now doesn't.

Did anyone else do this process and have the stutter go away?
 
I have dual x5570 in my 4,1(5,1), had the issues shortly after a fresh install when some animation or video was open..

However, the issue seems to be somehow gone for now..could not replicate it anymore
 
Alright, it wasn't a result of the switch in CPUs.

It was a game client I had on in the background. The moment the client was closed, the skipping resumed immediately. I've gone through several games I have on Steam now, and it seems like when any of them are running, the audio from iTunes stops skipping. It appears some common process that games on the Mac use rectifies this issue.

In the interest of providing a common, free client for people to try, and possibly use as reference for a fix, I looked up open source games for Mac. "The Battle for Wesnoth" (https://www.wesnoth.org) appears to fix the issue as other games do, and being open source it might be possible for someone to identify the core bit of code that could then be run as its own application? I haven't bothered trying the game beyond launching it and turning off the game's music, so don't take this as an endorsement.
 
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eMouse2k said:
Using the command given earlier cleared up the audio playback stuttering in iTunes, but resulted in general performance issues in other areas, most obvious with Youtube video playback.

Probably going to go back to dual CPUs as I can work around or even put up with the slight iTunes stuttering more than the performance/video playback issues.

Intel(R) Xeon(R) CPU X5570 @ 2.93GHz
Click to expand...
Hi, please PM me, I need you to test some fixes
 
Mac Pro 4.1>5.1 2 x 2.26 GHz E5520 with stuttering on Youtube (didn’t test any other)
Installed Mojave yesterday after several months waiting for Nvidia Web Drivers so bought an AMD RX 560 at half price on Amazon, while installing I read about this issue, so how can I downgrade to 10.14.3?
 
macgirl-mx said:
Mac Pro 4.1>5.1 2 x 2.26 GHz E5520 with stuttering on Youtube (didn’t test any other)
Installed Mojave yesterday after several months waiting for Nvidia Web Drivers so bought an AMD RX 560 at half price on Amazon, while installing I read about this issue, so how can I downgrade to 10.14.3?
Click to expand...
Are you willing to test a potential fix for me before you downgrade?
 
macgirl-mx said:
Sure

Also tested just now, iTunes very low to almost not stuttering happening, also tested iTunes and YouTube to AppleTV via Airplay no stuttering so far.
Click to expand...
parrotgeek1 said:
Disable SIP

sudo nvram boot-args=intcpumax=0
Click to expand...

PLEASE provide the full information to re-enable and explain what this actually does since not everyone knows...

See post #119 in this thread for code to re-enable your dual CPUs.

Also, this is a band-aid at best. It will need to be ripped off (re-enabled) and basically helps mask the real/true OS issue. It's great for troubleshooting and identifying the root cause, but expecting people to implement long-term is not realistic.

Edit: You may have posted different code.
 
bsbeamer said:
PLEASE provide the full information to re-enable and explain what this actually does since not everyone knows...

See post #119 in this thread for code to re-enable your dual CPUs.
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Click to expand...

Already read the whole thread before replying.

With sudo nvram boot-args=intcpumax=0 stuttering still happening, even worse I think.
Screen Shot 2019-05-01 at 9.41.15 PM.png

With sudo nvram boot-args="cpus=1” I cant distinguish the stuttering but system is very slow.
Screen Shot 2019-05-01 at 9.52.23 PM.png
 
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