Noticing the tendency for the higher end machines to suffer this issue in addition to the rather erractic nature of the problem in that everybody appears to have a slightly different issue and it's got me thinking that my issues tend to be after my machine has been switched on for a while. I saw another thread from a guy who used a 3rd party app to increase his fan speed in his MBP and it's cured his similar problems.
Could we be talking about an overheating issue here...? Have to admit after years of building my own PCs, those machines with poor cooling were always the ones with glitchy errors, but it seems strange that it's really only to do with video/sound...
Anyway, I notice there's a patch today... for HP printers - great, I'm sure that must be a real priority
It *could* be overheating, but then again, it seems that it could be a lot of things. I've tried it on a cold machine (new iMac), and the problem is there within a few minutes of watching full-screen video.
Here's all I know from this thread and my experimentation (and that of others):
1. It is not machine specific: iMacs, Mac Pros, and MBP are all affected
2. age of the machine isn't a factor: it affects brand new machines or those several years old
3. it is not a Flash problem
4. doing all the "normal" goodies (PRAM, repair, permissions, blah, blah) doesn't fix it
5. it is not a browser issue (happens with *any* browser)
6. it is not *only* video or *only* sound: it may be either or both
7. it is not Netflix (that is, Silverlight) because it happens in other apps
8. we *think* it isn't junk left over from 10.7 in the User folder because even a clean install on a wiped drive has the same issues
9. in addition to #6 above, the problem goes beyond just video stalls and audio "crackles": worse, it involves the entire system "rubberbanding" effect (the mouse or menus, etc. just lock up for 1-5 seconds then start working again.) Similarly, when the audio and/or video stalls, *sometimes* doing nothing for 5, 10, 30 seconds and everything is "OK" for a bit.
10. it is *not* other applications running or having run; lots of us have restarted (or shut down/restarted), and have no other (user) apps running except for one program when the problem starts.
Therefore, my THEORY is that this is a problem deep in the OS in terms of caching (?) or something (I'm not a programmer, so I have no idea) that's causing the problem to occur consistently yet sporadically.
After 2+ weeks of trial-and-error experimentation from all of us, it's unlikely that we will solve this issue.
However, if anyone on this list ***does*** manage to figure it out, you will be a legend, and we'll get c|net to interview you the next day.
Best to you all.
This is definitely a Mountain Lion issue, because using LineIn, I get crackling and sound degredation with pass-through audio going into my external audio interface of my S4... However, using Native Instruments S4 2.5.1 beta driver through Traktor 2.5.1 pass throught the audio plays perfectly.
Anyhow... since this is OS related, theoretically this should work:
What it does is disable USB 3.0 support... and forces USB 2.0 only... reportedly this fixed the sound degredation issue for everyone, even before the Native Instrument's 2.5.1 public beta driver...
So people may want to give that a shot prior to 10.8.1.
I just installed a 10.8.1 patch that i found on theses discussions...
I found the discussion in my email....... asking if anyone else can confirm the fix after the 10.8.1 patch.
and there is a link to download the patch. but when i click on the original Apple Discussion forum thread,
it acts like they locked and not allowing people to access it.
Re: Sound stuttering after Mountain Lion install
Can anyone confirm 10.8.1 fixes this problem?
You can download the patch here.. LINK
I downloaded it and installed it, it seems it fixed only part of the issues. BUT the crackle in audio is still present. I HOPE they fix it sooner than later.
here is my quick audio recording that demonstrates my crackle issue.
Used Audacity 2.0 and my Line 6 PODxt USB Guitar Processor input.