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I dont use the iTunes music store.
I did some tests today, and had 1 loop during an Audacity playback. I had quit everything else running with Activity viewer's quit function, then quit Activity viewer. I cant get less running than that and it still looped.
I still get a problem as well if I pull my headphones out during a recording (or plugging them in) which is some of the recording goes missing. I never had this before on Pismo or G4-TiBook.
I am awaiting tech advice from Computer Warehouse, but will demand a refund if this problem is not resolved, as it is a fault and I dont settle for working around a problem when that problem is faulty goods.
Just got off my second call to Apple regarding this issue. The support engineer said they had not been informed of any audio looping issue (which is strange considering the existence of technote #302978).
He said unless people call APPLE SUPPORT and create a case number, this issue will never be escalated to engineering. So... PLEASE CALL APPLE and report this problem if you have it. 800-275-2273.
To speak to someone directly, hit 000 or say "operator" to the voice system.
PBG4/15" 1.67ghz & MacMini 1.25 Mac OS X (10.4.3)
Thanks a lot for the recording - that really helps, since my new PB (one week old) also has the exact same problem.
The flaw itself is about as huge a disappointment to me as is Apple's unwillingness or (even worse) inability to come up with a fix (or usable workaround) for this.
The first reports of this problem that I found are now more than six weeks(!) old and the above mentioned article's recommendation is IMHO ridiculous or quite useless, since most applications I know use audio one way or the other (and all seem to be affected, I so far had the problem in iTunes, Quicktime and Skype).
I hate to say it, but it looks like the times when a Mac was the best computer money can buy seem to be over again - and the times where I just recommended my friends to also buy a Mac certainly are.
PowerBook G4 (15-inch Double-Layer SD) Mac OS X (10.4.3)
Last night I decided to "veg out" with my headphones on listening to some of my digitised audio cassettes. These are now 160kbs MP3 files of 46 minutes or so each. I chose to listen with quicktime player.
After about 2 minutes I started to get drop outs on a regular basis. These were random and not repeatable for any particular place in the music.
I opened Activity viewer, and noticed that often they happened at times when the system seemed to be doing stuff.
If I provoked the fault, by for example, browsing the web, with safari, and navigating with back or forward buttons, I could see large CPU spikes when these drop outs occurred.
If I grabbed hold of a scroll bar, or used 2 finger scrolling, and shook the page about in Safari, the CPU went to 100% and the sound broke up lots.
Now the interesting bit.
I tried to replicated the fault on my old Titanium PowerBook, 1GHz. I couldnt get the audio to break up at all.
I set virtual desktops to 16 desktops,started playing the music file, then launched iMovie,iChat,Airport,Photoshop,Mail,Safari,Opera,Firefox,Word,Excel,Powerpoint, iTunes,iView Media, Classic OS9, and Activity viewer.
The sound played on flawlessly. The other programmes were a bit slow (as expected. When I grabbed a page scroll bar in Safari and shook it I got activity viewer to show 100% CPU for over 2 minutes, and not a single sound glitch. The Ti-Powerbook got so hot it was burning my lap so I stopped.
I can only assume that there is either a sound card fault, or something is corrupting the protected memory space of audio applications. I dont know much about the workings of computers or Unix, but I know when they arent working properly.
On another thread I spotted that someone had found an intermittent fault by running hardware test on a loop. I am going to try this overnight tonight. I will keep you all posted.
Oh, I forgot to mention that I have logged this fault by phone with Apple UK support. They suggested resetting the PMU... like I hadnt tried it already! I tried it again... no change.
Interestingly, resetting the PMU on this PowerBook does not seem to affect any of the settings for time/date etc... In fact there is no indication that anything has happened at all. I wonder if that is working.
I'm removing power and battery, then holding power button down for 5+ seconds. Re-inserting battery, and powering up.
It just starts up like nothing has happened. Is this the same for everyone else??
This problem is making it most of the Mac forums I have looked at. From macnn.com http://forums.macnn.com/showthread.php?t=276150:
"This from LoopRumors:
A reliable source tells LoopRumors that Apple will unveil the next update in the sequence of Mac OS X Tiger releases on January 10, 2006. Previous reports pointed to the middle of December, however, new information suggests that 10.4.4 will be the first release compiled specifically for Intel processors, and will be available on January 10th. The update is said to consist of 120 bug fixes with targeted areas that include iPod integration, *Audio*, AppleScript, Bluetooth, CoreImage, Dashboard widgets, DVD Player, iMovie, GarageBand, Graphics (specifically Quartz), Graphics Drivers, iChat (specifically Video Conferencing), Safari, Sync Services and Spotlight."
PBG4/15" 1.67ghz & MacMini 1.25 Mac OS X (10.4.3)
I may have solved it!
Having run hardware test lots of times (couldnt find a way to loop the test though) I had no errors.
On the assumption that most audio is handled by quicktime, I searched the whole system for anything saying quicktime.
I found what may be the problem.
When I migrated from my old PowerBook, I transferred all programmes as well as files. I had forgotten that I'd renamed Quicktime 6, Quicktime651Pro. I dont use QT pro much (havent since getting the new powerbook).
This was therefore installed alongside Quicktime 7.
When I examined the package contents it had some identically named plist files as QT7.
Furthermore, many of my old files were set to use Quicktime651Pro as their default application.
Assuming that the native system is Quicktime 7, this means that 2 or more pref files of identical names were in use, as well as 2 different versions of Quicktime.
I have binned QT6 and all of its files, and I binned all quicktime pref files, and so far have played music with quicktime7 for several hours without a problem.
I will keep you posted if any more glitches happen.
I still get holes in recordings if I pull the headphones though. I suspect it is due to the extra complexity of the sound card, being analogue and digital.
Further to my posts on this topic, and with reference to the Apple article http://docs.info.apple.com/article.html?artnum=302978 , I would like to add that this morning I had a massive loop. Nothing unusual except that I didnt have any applications open! I was listening to an mp3 in the Finders preview window.
Now I know that technically the Finder is an audio application of sorts, but I cant think of a more minimal way of playing audio than that, and it still loops. Apple's article is just a load of rubbish.
Indeed, that 'solutions document' isn't really worth much. It's clearly a placeholder until someone finds and fixes the bug.
Not only do I sometimes get looping, but I also hear 'artifacts' in the audio (as if the compression was poor) even though it plays back fine elsewhere.
I'd be curious to know if any other contributors to this thread have 'APE' (Applications Enhancer) installed? I had an earlier version when I installed a trial version of Detour on my previous machine, and it got copied over. I've done an upgrade, but am going to play around a little more with disabling it later, to see if there's any difference.