P7N2 Stutter

Hi,
I'm having some trouble with stutter that I can't seem to get rid of. I get microstutter and stutter in all games that I run, on both XP and Vista. My setup:
P7N2 Diamond (790i Ultra)
QX9650 @ stock
4GB Corsair DDR3 @ stock
NVIDIA RAID stripe (x3 WD Caviar)
8800 Ultra (single)
The effect is most pronounced in world of warcraft, where I get horrendous stutters about once every 5 seconds. I've reverted all settings back to auto to resolve this, and the problem remains.
Any ideas?
Cheers,
Rai

Hi just checking back in.
Hrmmm ok video stutter huh it then huh. Remove sound card for following testing. keep only motherboard, PSU, hard drives. Please re seat the memory after rubbing terminals with a rubber and reseat the video card assuring approiate power to all devices. Then set motherboard back to non overclocked settings if this is your case.
Jmicron does not handle the internal sata ports that is handled by nvidia chipset and this particular motherboard actually has two nivida chipsets functioning on it. I am guessing you have already updated your mobo bios if not please see here. https://forum-en.msi.com/index.php?topic=118146
Things to do.
http://downloads.guru3d.com/download.php?det=745 download this and remove all nvidia based drivers you can also clear cabs if you wish then reboot. before you do create a restore point that you can revert back to. Vista is still shaky with driver changes sometimes.
Then install new Nforce drivers from here (OBVIOUSLY DOWNLOADING BEFORE REMOVING NETWORK DRIVERS IF YOU ONLY HAVE ONE PC)
http://www.nvidia.com/Download/index.aspx?lang=en-us choosing nforce 7 and the approiate operating system. PLEASE NOTE NVIDIA XP CHIPSET DRIVERS DO INSTALL ON VISTA HOWEVER NEXT REBOOT VISTA IS FOREVER CORRUPTED TILL REINSTALL, so pay attention :P I have made the mistake myself before when up at 4am fixing a pc.
Then install your Gforce 8 series drivers from the same site
http://www.nvidia.com/Download/index.aspx?lang=en-us
This is actually all you need to make your system function appropriately for most things. If you wish you can then install the Nvidia system tools which incorporates the old Ntune and also manages raid monitoring and system monitoring. You may then install your sound card drivers / sound card if you want. you can also clear "creative drivers' at the same time as the nvidia ones using the same tools.
Please do not install the nvidia network media shield. It has always been a source of problems and most do not even know what it fully does and do not need it.
If you still have stutter after this it means 2 things.
reason 1. You have a bad install of your selected operating system.
reason 2. Your issue is hardware related.
Hardware issues for stutter are likely to be bad PSU check this first as its the easiest thing to remove from the equation. Also this motherboard has problems with PCI express voltages. I myself have a 1500watt and can not run more then 2 9800gx2's and a 9600 before the pci express slots can't provide enough power. Other common culprits are Ram issues but the symptoms do not point here as the ram would most likely cause your system to lock up/system32 corrupt or not post at all, rather then stutter in video. Check IRQ in system device manager to see what is sharing your video card IRQ. Try to disable unnecessary things if they are sharing and are also not need. Like the motherboard firewire ports.
Then in order of most likely to least likely, Motherboard faulty, hard drive faulty(unlikely as the symptoms do not match, hard drives tend to corrupt data when you don't know there faulty and make a loud clunking noise when you do know there faulty , then least likely cpu faulty. CPU's are actually one of the more resilient devices in a computer (unless you have fried it)
Goodluck
Julez

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Temporary video stutter in games, mid 2009 MBP

Hi all,
I've been having a chronic issue with my mid-2009 MBP with 256MB NVIDIA 9400M, only noticeable when playing games. Starting a few minutes after I start playing a game, the video will stutter in regular, discrete chunks. It will run fine for about a second, then lag horribly for a second, and alternate between these two. This is especially noticeable with graphics-intense games such as Starcraft 2, but happens even for certain less demanding games too.
The funny thing is that the issue goes away after 15-20 minutes of play or so. After that, no matter how long I play for (for periods up to several hours), the issue does not return. This makes me think it must be some sort of software or driver issue, and thus hopefully fixable. On the other hand, it happens both in OSX and Win 7 under Bootcamp.
One thing is that I have upgraded the RAM and installed a new hard drive; maybe these are causing problems? I don't remember if this issue predates the new hardware.
Anyone have any thoughts? I've poked around a bit and haven't seen anyone report this exact same issue.
My specs are:
MacBook Pro
13-inch, Mid 2009
Processor 2.26 GHz Intel Core 2 Duo
Memory 8 GB 1067 MHz DDR3
Graphics NVIDIA GeForce 9400M 256 MB
EDIT: found this post with what seems to be the same issue: https://discussions.apple.com/message/15530456#15530456

Perhaps you could try this to resolve your issue: http://support.apple.com/kb/HT3964
If the issue still persists, I would contact AppleCare, or may an appointment at the Genius Bar. There may be diagnostics they can run to determine if you have a failing logic board or GPU.

Stutter in iMovie 5 & 6 - causes and workarounds

This topic discusses the problem of stutter in the playback of iMovie 5/6 projects — where the playback pauses repeatedly. The cause of the stutter is discussed here, with possible workarounds.
Over the last several weeks I've examined several stuttering projects, one provided by Marilyn Hudson and three by Benny Alford. Thanks to you both. They were very helpful.
I also examined several projects I created myself, after discovering how to force a project to stutter.
The tests I ran suggest that stutter is caused by the number of audio clips in the timeline of the project. When a large number of audio clips have been added to a project, the project begins to stutter. The stutter worsens as more audio clips are added, eventually causing the project to play very poorly, if it plays at all. The stutter improves as you remove audio clips, eventually allowing the project to play normally.
Frank Farmer, whose forum topic about stutter describes the problem nicely, is a good read:
http://discussions.apple.com/thread.jspa?threadID=495288&tstart=0
Benny's topic is also very helpful:
http://discussions.apple.com/thread.jspa?threadID=511773&tstart=100
BEFORE WE BEGIN, A CAVAET OR TWO...
Identifying software problems is never easy, especially when you don't have the code to read. So my conclusions may not be accurate in every respect. There may be "gaps" still to fill.
Certain features of the stuttering problem can vary from user to user and from project to project, so what I say may not apply to everyone or to every project. Likewise, your experience may not apply to others.
In light of that uncertainty, I hesitated a bit to even post this message, for some conclusions may be "wrong" for some users. Hopefully they will be "right" for most.
If your experience is hugely different than mine, please say. We will all benefit.
THE PROBLEM
Stuttering takes several forms. It may include pauses in video playback, pauses in audio playback, audio distortion, or some combination. I believe these all have the same cause, creating a variety of playback symptoms. (The behavior may vary because of a difference in video cards and other hardware features. The amount of RAM doesn't seem to matter. I didn't have lots of Macs to test.)
Stutter is not simply an inconvenience or nuisance. Stutter can make it impossible to edit a project. Playback becomes so poor you can't view the editing you've done.
Severe stutter can also make simple tasks impossible to do, like moving the playhead, starting/stopping playback, selecting clips, undoing changes and saving. Your editing grinds to a halt.
HOW THE PROJECTS WERE STUDIED
When I began I didn't know what I was looking for, of course. I had never seen stutter in any of my projects, but had read reports by others and had some guesses. I poked and prodded the projects looking for clues, aided by software I wrote to help evaluate the type and number of project clips. I tried to explore as many possible causes as I could think of, ruling out possible causes.
THE CAUSE
Every project I tested could be forced to stutter by adding a large number of audio clips. Conversely, every stuttering project could be made to stop by removing audio clips. The exact number of audio clips that caused stutter varied, but not the pattern.
Based on what I saw, the major contributing cause to stutter — perhaps the only cause — is the number of audio clips in the Timeline of the project. That will definitely cause the problem, not the length of the project, nor the project size, nor the iMovie version, nor the number of video clips.
I was unable to find any other contributing factor. You can't prove a negative, however, so I cannot be certain other causes don't exist. As we discuss this topic more perhaps other factors will emerge.
SEVERITY
The severity of the stutter varies by the number of audio clips in the timeline. Stutter begins with a few simple "popping" sounds, and gets worse as more audio clips are added. The popping is replaced by pauses and audio distortion. Stutter continues to worsen as you add more audio clips, eventually making the project hard to edit.
WHAT KIND OF AUDIO CAUSES STUTTER?
All kinds of audio clips cause stutter. The type of audio you add doesn't seem to matter. It's the total number of audio clips that matters, not the type.
The audio can be any of these types:
1) Songs imported to the project from iTunes or elsewhere;
2) Audio extracted from video clips; and
3) Voiceover clips — narrations you record in iMovie.
WHAT COUNTS?
It's the number of audio CLIPS in the Timeline that matters, not the number of audio files you import or create. Importing a song adds one clip to the timeline and one file to the project. Splitting that clip adds additional clips, increasing the likelihood of stutter. Splitting extracted audio clips adds to the clip count too.
Every audio split you do adds to the total, increasing the likelihood of stutter.
WHAT DOES NOT AFFECT STUTTER?
I saw no evidence that these factors contribute to stutter:
1) The number of audio and video files (files stored in the project's Media folder).
2) Overlapping clips in an audio track.
3) The length of audio clips.
4) Which audio track the audio clips reside on.
5) The number of video clips.
6) The length of the project.
7) The size of the project (file size).
8) The size of the iMovie Trash.
HOW MANY AUDIO CLIPS WILL CAUSE STUTTER?
It varies a bit, so it's hard to say exactly. Projects I tested from one user began stuttering at 60 audio clips. Others began at 125. The number seems to vary from Mac to Mac. My guess is a typical maximum is 90-100 audio clips, but that's just a guess.
Although the number of clips may vary from user to user, my guess is the number may be relatively constant for all your projects. Your projects might tend to start stuttering at about 60 clips, 90 clips, 125 clips or whatever. But that's just a guess.
One of the reasons a precise number of clips is difficult to say is that the stutter itself varies from occasional popping to long pauses, affected by the number of audio clips. It's sometimes hard to know exactly when stuttering begins. As you remove audio clips from a stuttering project, for example, the stutter may appear to go away, but you may later hear occasional popping. Then when you remove five more audio clips you achieve perfect playback.
COUNTING AUDIO CLIPS
Note that iMovie 5 and 6 lets us count the number of audio clips in the Timeline. When you select clips with the mouse, iMovie displays the number of selected clips at the bottom of the iMovie window.
Unfortunately, the clip count is not displayed when the "Select All" menu command is used to select clips. You must physically drag across the audio clips to see the total.
HOW CAN I FIGURE OUT THE CLIP LIMIT FOR MY STUTTERING PROJECT?
It's not hard to figure out how many audio clips your Timeline can hold without stuttering. You can do a simple test where you remove audio clips until the stutter stops.
First Save the project. (Do NOT Save the project again during the test.) Then select ten audio clips or so, and hit the Delete key. Check for stutter. If the project stutters, remove more clips. Continue removing audio clips until the stutter stops, then count the remaining audio clips. To count the remaining clips, select all the audio clips with the mouse and check the total reported at the bottom of the iMovie window. Subtract a few — just to be safe — and that's your clip limit. (If you hear occasional popping sounds later, subtract another five clips.)
To restore the project to its previous state, choose File > Revert to Saved.
IS THIS JUST AN iMOVIE 6 PROBLEM? OR JUST AN iMOVIE 5 PROBLEM? OR WHAT?
Stuttering occurs in both iMovie 5 and iMovie 6. I saw the same stutter in both.
There were indications that stutter begins earlier in iMovie 6 — with 10% to 20% fewer audio clips. That may explain why some users report that stuttering began when they upgraded to iMovie 6. iMovie 5's tolerance for audio clips seems a bit higher, so projects that play okay in iMovie 5 might begin stuttering when upgraded to iMovie 6. They may have been "on the edge" in iMovie 5, but when upgrading to iMovie 6, they start stuttering.
Stuttering also occurs in iMovie 3 and 4. I could create stuttering projects in iMovie 3/4 too.
The only version of iMovie that refused to stutter was iMovie 2. (I stopped the test after adding 400 audio clips.) Note that iMovie 2 may use very different QuickTime routines than later versions of iMovie, which may explain its reluctance to stutter.
SO, WHERE'S THE PROBLEM?
In spite of what I just said about iMovie versions, I suspect this is not an iMovie problem. The problem may lie elsewhere. Here's why:
1. It's possible to create stuttering movies in QuickTime Player too, completely independent of iMovie. I used QuickTime Pro to add audio tracks to a movie, and found that a normal QuickTime movie can be made to stutter. It behaves just like iMovie. (QuickTime Pro's "Add" command lets you add multiple audio tracks to a movie. Each audio track is equivalent to an audio clip in iMovie.)
2. QuickTime Player also stutters when it plays the small QuickTime reference movie iMovie places inside the iMovie project. (iMovie 2 has no such movie, suggesting its reliance on QuickTime is different.)
The existence of stutter in both QuickTime Player and iMovie suggests the problem is in the QuickTime software itself, not iMovie. iMovie and QuickTime Player both use QuickTime system routines to edit/play our movies. I suspect that's where the problem lies. (I mean the QuickTime system software underlying both the QuickTime Player and iMovie, not the QuickTime Player application.)
CAN I EXPORT PROJECTS STUTTERING PROJECTS TO THE CAMERA?
No, a stuttering projects cannot be successfully exported to the camera. The copy on the tape will stutter too. If iMovie can't play the project smoothly, it can't export smoothly to the camera.
CAN I EXPORT STUTTERING PROJECTS TO QUICKTIME?
The stutter does NOT affect exporting to a QuickTime movie. That export succeeds, I suspect, because the export to QuickTime is not a time-sensitive operation, unlike the export to the camera. The QuickTime export can take as long as required.
The ability to export successfully to QuickTime lets us use some of the workarounds described below.
CAN I BURN A DVD OF A STUTTERING PROJECT?
Yes, you can successfully burn a DVD of a stuttering project. The iDVD encoding acts a lot like exporting to QuickTime, apparently. iDVD takes whatever time it needs to encode the project; it's not a time-sensitive operation.
CAN STUTTERING PROJECTS BE REPAIRED?
Projects cannot be repaired so they will never stutter. The only permanent fix is for Apple to fix QuickTime, if that's where the problem lies.
Workarounds can remove the stutter, however, allowing you edit the project successfully.
IS THERE AN EASY WORKAROUND?
The workaround ADJUST PLAYBACK SETTINGS below is pretty easy to implement. Trouble is, it doesn't always work, and the improvement may only be temporary. But the workaround is easy to do, so it's worth a try.
This workaround adjusts your iMovie playback settings and Mac monitor settings to make it easier to play the movie. That reduces the playback burden on your Mac and may raise the number of audio clips the project can contain before stutter begins.
This workaround may also make it easier to edit your project, making it easier to apply OTHER workarounds. So it's a good first step before implementing (better) workarounds.
ARE THERE OTHER WORKAROUNDS?
Yes, there are several effective workarounds. They all eliminate the stutter in the iMovie project.
The workaround to choose depends on the amount of editing yet to do, and whether or not you want to preserve all the clips in the project as discrete clips. And, of course, the workaround must be convenient for you. Some require more "expertise" than others.
It goes without saying that the simplest workaround is to try to limit the number of audio clips you include in the Timeline. That's not an ideal solution for all projects, obviously, but when you can do it, that's the best solution.
The other workarounds are posted below, one workaround in each message. As you try them, please reply to that message when suggesting changes and reporting errors. Future readers should check for updated versions of workarounds posted later in this topic.
GENERAL OBSERVATIONS
• The type of stutter we see varies quite a lot. One project I tested, the large project authored by Marilyn, showed considerable VIDEO stutter when played on her iMac. The audio played fine. There was so much stutter the project could not be edited. When I moved Marilyn's project to my PowerBook 1.5 GHz G4, worse video stuttering occurred.
But when played on my desktop Mac (Dual 1 GHz PPC G4) the VIDEO played just fine but the AUDIO stuttered. The audio slowed down, as if playing in slow motion. A clip's audio could sometimes be heard well after the playhead moved beyond the end of the audio clip.
• It's easy to create a stuttering project. Here's how: Create a new project, record a few seconds of audio voiceover, Copy the voiceover clip and Paste it at the end of the project 9 times. (To move the playhead to the end before you Paste each time, press the End key on your keyboard.) Then select all 10 audio clips, Copy them, and Paste at the end of the project 9 times. The project now has 100 audio clips. Try playing the project. If it fails to stutter, Paste again at the end of the project. Repeat Pasting at the end until the stutter begins. Stutter will get progressively worse the more clips you Paste.
• I saw some strange window behavior when editing badly stuttering projects. The iMovie window began behaving strangely. Activating windows in OTHER applications windows stopped working normally. Clicking in the window of another application would activate the window — allow me type in it, for example — but the iMovie window refused to allow it to come forward. The iMovie window remained on top, although its three red, orange and green window titlebar buttons were disabled. It was as if the iMovie window had changed into a palette that refused to go to the background. Re-launching iMovie resolved the problem.
WHAT ABOUT iTUNES MUSIC?
There are reliable reports that (some types of?) iTunes music may affect stutter. Unfortunately, I wasn't able to reproduce that problem, no matter what music I tried. I can't suggest what type music to use — or avoid.
There is a workaround that has worked successfully for some. That is to use iTunes to burn an Audio CD of the songs you want to use, then import the songs directly to iMovie from the Audio CD. See the workaround "BURN SONGS TO AUDIO CD" below.
THIS IS GETTING LONG
There's more I could say, but it won't add much value. We'll learn more as we gain more experience, I'm sure.
Good luck with your projects. Let's hope the underlying problem, whatever it is, is fixed soon. In the meantime, share your insights and discoveries.
Karl

WORKAROUND 3: Divide and Conquer.
BEST SUITED FOR
This method is best suited for projects where you still have quite a lot of editing to do, and the project is stuttering badly.
This is my favorite workaround, for it allows you to continue to edit the clips normally as discrete clips, but in a stutter-free environment.
SUMMARY
To reduce the number of audio clips in the project, this workaround divides your project into two smaller projects. Each project — each Part — contains a smaller number of audio clips so it plays smoothly. You can edit the clips normally, for the project plays smoothly.
Later, when you have finished editing the Parts, you re-assemble the Parts back into a single project. The method of reassembly we use will not cause stutter in that project.
As you add more audio clips to each Part, you may see a Part begin to stutter again, just like the original. You've hit your audio clip limit again. It's not a big deal. You simply divide that Part in half again to reduce the number of audio clips, and the new, even smaller Parts will play smoothly.
Usually it's necessary to divide a stuttering project just one time, but more may be needed.
ADVANTAGES
Each Part of the divided project contains half the clips of the original project. The clips are preserved as discrete clips, which allows you to edit clips normally. (Other methods join the video clips, audio clips, titles, and transitions into a single clip so they are no longer editable as discrete clips.)
DISADVANTAGES:
1) Because the project has been divided into two (or more) Parts, it's not possible to play your project from start to finish.That's not a big problem, but it's not what I would prefer. (If playing everything is important to you, see the MODIFIED DIVIDE AND CONQUER paragraph below.)
Of course, you'll be able to play all the Parts together when you re-join the Parts later.
2) This workaround can require significant amounts of disk space, especially if the clips imported from the camera are long-running clips. (An hour-long lecture, for example, with no scene breaks.)
If the clips are small, dividing a 10GB project in half will use an additional 10GB disk space (the total for the two Parts). As you split the Parts, it will temporarily use more.
If the clips in the original project were long-running clips, each Part may require the same disk space as the original project. If the original project was 10GB, each Part may use 10GB. This is because of iMovie's non-destructive editing feature, which copies the long Media file for the long clip in the original project to each Part.
Later, when joining the two Parts into one project, allow 13GB for each hour of total run time.
3) If the project contains many clips, it may be difficult to divide the project's video and audio tracks accurately. iMovie bugs may make it difficult to correctly select and delete clips. Care must be taken when selecting and removing clips. More details below.
TO DIVIDE THE PROJECT, FOLLOW THESE STEPS
• Open the stuttering project.
• If you haven't done it yet, adjust your Mac and iMovie settings as described in WORKAROUND 1: Adjust Playback Settings. This may make it easier for you to divide the stuttering project. (Return your settings to normal after dividing the project.)
• In iMovie preferences > General, turn ON the checkboxes "Snap to items in Timeline" and "Play sound effects when snapping." We will create bookmarks in a moment, and this makes them easier to use.
• From the iMovie menubar, choose View > Switch To Timeline Viewer. (Ignore if the Timeline already uses that view.)
• Locate a good place to divide the project in half. In a moment, you will move the playhead to that place and create a bookmark. Later, you will divide the project there.
(If the project already has many bookmarks, consider removing all the bookmarks to make it easier to find your new bookmark. Use the iMovie menu command Markers > Delete All Bookmarks.)
• If your audio clips are heavily grouped in one area of the project, split the project in the middle of that area, not the middle of the project. You goal is to divide the number of audio clips roughly in half.
• Look for a location like this, which is ideal:
- At the start (or end) of a video clip.
- Where that end of the video clip has no audio clip below it.
If you can't find a clip end that has no audio clip below it, move the playhead to the start/end of a video clip, select the audio clip below it, and split that audio clip.
If the video clip is so long you must split it, split the video clip where there is no audio clip directly below it.
• Place the playhead where you want to divide the project, precisely at the start (or end) of a video clip. Create your bookmark.
• Write down the location (the playhead position) of the bookmark you created. If you've moved the playhead away from the bookmark, first re-locate the playhead exactly over the bookmark. Use the menu command Markers > Next Bookmark (or Previous Bookmark) to go there.
The playhead position is displayed just under iMovie's video Monitor. The time shown will be something like "33:52:10". Write it down.
• Save the project. Quit iMovie.
• In the Finder, click on the project and choose File > Duplicate. The Finder will require several minutes to duplicate the project. The Finder will name it "<Project Name> copy.iMovieProject", where <Project Name> is the original name of your project.
• When the Finder is done duplicating it, rename the duplicate project "Part 1 <Project Name>.iMovieProject". (We'll refer to this part now as "Part 1".)
• Open Part 1 in iMovie.
• In a moment, you will remove all the video and audio clips AFTER the bookmark, leaving the video clips and audio clips BEFORE the bookmark intact. They will comprise Part 1. iMovie sometimes makes it hard to select the clips you want to remove, so go slowly and carefully here.
• Read this paragraph and the three after it before you continue. Starting at the end of the project and moving towards the bookmark, select groups of audio clips in the bottom Timeline track and delete them. (Select the clips, then hit the Delete key.) After removing a group of audio clips from the bottom track, remove (any) audio clips above them in the middle track, then remove the video clips above those. Removing the video clips makes the timeline shorter, easier to work with.
• As you approach the bookmark, be careful. When you select an audio clip that's located close to the bookmark, iMovie sometimes (inappropriately) selects an audio clip or two BEFORE the bookmark, even though you don't drag over it. (I suspect those are audio clips where Direct Trimming has been used, and iMovie gets a bit confused.) It's important you not remove any selected audio clip located before the bookmark. You must unselect those before hitting the Delete key. To do that, hold down the Command key — the Apple key — and click on any selected clip located before the bookmark. Make sure only the audio clips you want to delete are selected, THEN hit the Delete key.
• If you mess up, don't worry. Use iMovie's Undo command. Or to undo all your changes, choose File > Revert to Saved, which reverts Part 1 back to when you opened it.
• Sometimes iMovie fails to delete all the video clips you've selected. (Another bug.) As you approach the bookmark, zoom in on the Timeline to view the bookmark area more closely. After pressing the Delete key to delete the video clips you've selected just beyond the bookmark, make sure all the video and audio clips after the bookmark were removed. If not, press the Delete key again.
• How go back and do what you just read.
• When all the audio and video clips after the bookmark have been deleted, save Part 1.
• Play Part 1. If it doesn't play smoothly, it still contains too many audio clips. That's unusual, but it happens. Later, you will have to divide it again, but don't worry about that now. You can divide it again after finishing Part 2.
• To discard the clips no longer needed in Part 1, empty the iMovie trash. Emptying the trash will save the project again, automatically. (It may be necessary to also empty the Finder trash to recover the disk space.)
• We now move on to Part 2. It's a bit different, so don't skip reading these instructions.
• Quit iMovie, closing Part 1.
• Duplicate the original project again. Name this copy "Part 2 <Project Name>.iMovieProject".
• Open Part 2 in iMovie.
• IMPORTANT: For Part 2, it's crucial that you lock the audio at the second half of the project before removing video clips in the first half, which you are about to do. Locking prevents the audio from sliding over when you remove the video clips in the front half, losing sync with the video.
To lock the clips , move the playhead to the start of the first audio clip you'll keep, then select all the audio clips and choose Advanced > Lock Audio Clip at Playhead.
• Starting at the bookmark and moving back towards the start of the project, select audio clips in the BOTTOM audio track and delete them.
• Repeat for the audio clips in the TOP audio track (the middle timeline track.)
• You are about to remove the video clips before the bookmark. There's a couple of things you need to know first.
1) Removing the video clips will dislodge the bookmark. Ignore its new position. The bookmark will no longer be located next to the dividing clip. That's okay. You won't be using the bookmark again.
2) iMovie may not actually remove all the selected video clips when you hit the Delete key. A few video clips may remain, still selected, at the (new) beginning of the project. Do not click the mouse for clicking it will unselect those clips. Before clicking the mouse, use the zoom slider below the timeline to zoom in on the (new) start of the project. If you see selected clips there, hit the Delete key AGAIN to remove them.
• If you don't understand what you just read, read it again. Then select all the video clips before the bookmark and delete them. Zoom in to check for any selected clips that were not deleted, and press the Delete key again, if necessary.
• Save Part 2 and empty the iMovie trash.
• If everything worked as it should, the Part 2 audio and video should still be in sync and the project should play smoothly. If it doesn't play smoothly, Part 2 still contains too many audio clips. You'll have to divide Part 2 again later.
• If either Part 1 or Part 2 needs to be divided again, use the same technique we just used, but instead of duplicating and dividing the original project, duplicate and divide Part 1 or Part 2. First read WHAT IF THE PARTS BEGIN STUTTERING LATER? just below for a naming suggestion.
WHAT IF A PART BEGINS TO STUTTER LATER?
As you add add more new audio clips to Part 1 or Part 2, these projects may eventually start to stutter, just like the original project did. That's okay, for now you know how to eliminate stutter by dividing the project. When dividing Part 1 or Part 2 use new names like "Part 1A" and "Part 1B", or the names that work for you.
HOW TO RE-JOIN THE COMPLETED PARTS
When you are done editing all the Parts, you will likely want to join the Parts back together in a single project that you send to iDVD, export to QuickTime, or export to the camera. (See below when exporting to the camera.)
Don't worry, the method we use to join the Parts won't increase the number of audio clips, so the joined project won't stutter.
FOLLOW THESE STEPS TO RE-JOIN THE PARTS
1. Create a new iMovie project. Name it "Joined <Project Name>.iMovieProject" or something. Save the project.
2. One by one, locate the movie "Timeline Movie.mov" that's inside each of your Part projects and drag that movie into the Joined project timeline. (Dropping the movie on the Timeline imports Part 1 to the Joined project.) First import Part 1, then Part 2, etcetera.
To locate the Timeline Movie inside the Part project you must first open the project package to see what's inside. In the Finder, Control-click on the project icon and choose "Show Package Contents" from the popUp menu. A Finder window will open, showing the contents of the project package.
Double-click on the Cache folder. Inside you'll find the QuickTime movie "Timeline Movie.mov". (It's a special kind of QuickTime movie, called a reference movie, that has no audio or video of its own, just pointers to files in the project's Media folder.)
Drag the Timeline Movie.mov into the Joined project timeline. That will import the audio and video of that Part as a single clip to the Joined movie. Because all the audio clips are "flattened" as part of one video clip, the Joined project has no audio clips, only one video clip for each Part. So the Joined project won't stutter.
When all the Parts have been imported, add your Chapter Markers for iDVD to the project, if desired, and send the project to iDVD.
EXPORTING TO THE CAMERA
When exporting the divided project to the camera you may prefer to export the individual Parts projects instead of the Joined project. The reason is that the Parts projects contain discrete clips, just like the original project, while the joined project contains only a few clips, one for each Part.
When exporting a project to the camera iMovie preserves the clips as clips. Later, if you re-import that tape back to a new iMovie project, iMovie returns the exported clips as clips.
If you want your tape to contain all the clips of all the Parts, export the Parts to the camera, not the Joined project. The clips will return as discrete clips when the tape is re-imported. Clips like titles and transitions will no longer be editable, but they will return as discrete clips.
(Some clips in the Parts don't return as discrete clips. Any adjacent clips iMovie has edited are merged into one clip when exported to the camera. So two adjoining title clips will return as a single clip.)
MODIFIED DIVIDE AND CONQUER
If you want to able to play Part 1 as you edit Part 2 — instead of playing one Part at a time — you can modify the Divide and Conquer method to include Part 1 in your Part 2 project. This requires more disk space, but that may not matter.
When you done editing Part 1 and are ready to start editing Part 2, drag the Timeline Movie.mov from Part 1 to the beginning of the timeline in Part 2 (after locking the audio clips in Part 2). That delivers all of Part 1 as a single clip in Part 2. That lets you play Part 1 as you edit Part 2. (When joining the Parts, skip importing Part 1 to the Joined project. It will arrive with Part 2.)
FINALLY
This is the most complicated workaround, but for some projects, arguably the best. If I've missed something, please say so we can avoid problems.
Karl

Why does iMovie file stutter after QuickTime upgrade from 6.5.2 to 7.1.3?

I have a fifteen minute iMovie project that played fine with
QT 6.5.2. About a year ago I upgraded to the, then, current QuickTime version - I think it was 7.0.1, or something - and this particular movie file began to playback erratically. A search of Discussions turned up the possibility that QT Version 7 did not work well with Panther. I deinstalled that version of QT and went back to 6.5.2 and the project again played back correctly and I have been happy until recently upgrading to the current version of QT (in order that songs and videos downloaded from iTunes Store will play, for one thing) hoping that the previous glitch might have been fixed. The same movie file that experienced the previous problem is again having fits. At this point in time it is difficult to re-install 6.5.2, nor do I really want to. Anybody have any suggestions on how to get this file to play correctly? Strangely, no other video files have been affected. They all play back correctly using QT 7.1.3 - the current version. What is it about that particular iMovie project?

Erratic playback — sometimes called stutter — can occur in iMovie projects. It tends to be caused by the number of audio clips. But sometimes it's caused by a particular song.
http://discussions.apple.com/thread.jspa?messageID=2597033#2597033
When it occurs because of a particular song, re-importing that song as described in that thread will usually fix the problem. Essentially, the fix involves using iTunes to burn the song onto a CD, then importing the CD AIFF file to the project.
Karl

Converting to MP3 causes iTunes to Not Respond while using 50% CPU usage and makes my computer stutter

Anytime I attempt to "Createa an MP3 Version" of a track, it will take a REALLY long time to work.
Right now I am attempting to convert an audio book I have which has 88 tracks. Once I start to convert anything more than 1 track at a time, iTunes immediatly becomes "Not Responding" and takes up about 50% of my CPU the entire time. It seems like it's doing something in the background but it won't even update the screen anymore, creating weird effects on my screen (Ghost menu bars show up at the top of my screen, etc.). In addition, once iTunes becomes non-responsive, my entire computer starts to "stutter" meaning that every other second everything momentarily hiccips and stop for a split-second. This means that while iTunes is converting any multiple MP3 files, if I drag the mouse across the screen, it stops every other second. Any videos that I try to play pause every other second briefly. Basically, my computer becomes almost unusable. Plus, while iTunes is working in the background, different programs randomly jump to the front of the screen. I will try to be using my web browser while iTunes is working in the background. Then, suddenly, iTunes pops back up to the foreground in front of my browser (put still won't be responsive to clicks). My notes program will also flash windows in front of my web browser while surfing, again, only when iTunes is running in the background.
I really don't understand:
1. Why it takes so much time to convert any file to an MP3 file. Even converting a single track takes a few minutes. I'll let my Macbook Pro (with Windows) sit for HOURS upon hours trying to convert the 88 track audio book and it always freezes up and never comes back.
2. Why iTunes becomes non-responsive so quickly and won't allow the screen to update once it starts "thinking." It caps out around 50% of my CPU power so it's not like it doesn't have the headroom to refresh the screen while it works.
3. Why does iTunes' working in the background affect every other program I am running? I don't mind if it uses up CPU cycles in the background, but if it makes my computer unusable while doing so, it's really not worth it.
I should state that I love Apple products (even though I use Windows on my MBP for school purposes). However, I absolutely DREAD having to do anything with iTunes anymore because it has become such a hog on my computer. Someone please tell me that there is something wrong with my iTunes and/or a setting I should change. I have already re-installed iTunes from scratch before and that didn't help.

Not a solution, but if the Podcast feed is dormant, why not unsubscribe?
As to the file structure for media on the device it is deliberately obscured as a countermeasure to casual piracy. See Recover your iTunes library from your iPod or iOS device. Content put on the iPod by a non-iPod aware product is going to treat it like any external drive. The iPod firmware won't read that media.
tt2

How can I proactively prevent A/V stutter before starting a project?

For the teeming masses who have iMovie projects that won't playback without stutter, there are several great solutions spelled out here in
"Stutter in iMovie 5 & 6 — causes and workarounds":
http://discussions.apple.com/thread.jspa?messageID=2597033#2597033
And thank goodness for Karl Peterson and the rest of the folks who figured it out. I only wish I had read the posts earlier myself, as trying to figure it out myself was maddening!
I used Karl's strategy of "Divide and Conquer" for my 50 minute iMovie5 video that had lots (70+) extracted audio bits and imported songs. I've had to cut it into 4 separate project pieces so far, and it's helped.
Now for my question: I have hours of raw tape just waiting for my next project. I'd prefer to not deal with the stutter issue work-arounds, for as good as they are, especially if you are done with a project, they are awkward if you are editing an entire project at once.
It appears that the number of extracted audio clips is the big culprit in causing stutter...is there any smart way to go about editing my project from the start and somehow avoid extracting audio or work around it?
I suppose one solution is just to set up the entire movie project as many smaller ones, with each one having a "managable number" (on my G5 it seems like that's only 20 or so) of extracted audio clips. But I'm just a weekend home-movie warrior, and due to usually poor advance edit-planning & last moment decision making, I'd like to be able to edit any part of my movie from start to finish at any time. Also, I have iMovie5, which doesn't allow for multiple projects to be open.
And again, thanks to all who have stuck with it in helping with the stuttering problem!

Hi again,
I've sort of answered my own question a bit. The way I was in the habit of editing was to mute the audio of the video track, and extract any audio I wanted to keep, even if I wasn't physically separating it from the video track or moving it elsewhere. So I returned to my project, and clicked on the video clips in the timeline whose audio I had extracted, and lifted the audio levels from 0% to 100% and tinkered with the levels/fades from there. I didn't know you could resurrect the audio after extracting the audio; I pictured them as two separated parts of a whole. Score a point for non-destructive editing. Anyway, after that I trashed the extracted audio and it played perfectly.
Of course, if you are moving around audio portions away from the original video clips, I still think you need to extract the audio. With certain projects you may have to do that a lot, leading to known problems. So I guess my original question still begs a discussion!?!
Garrett

Jitter, stutter, or jerky playback on output

Hi friends,
I've edited a video in Premiere Pro CS4 and it plays smoothly in the timeline. However, when I export it for DVD output, and then preview it in Encore, every minute or so, it will play one frame out of order. I don't know whether to describe this as a jitter, a stutter, or jerky playback. The preview is accurate: if I burn a DVD from Encore, the DVD will have the same glitches in playback. Again, Premiere plays everything fine.
The frame can be pulled from before or after the current point in the timeline. The first glitch occurs at 08s 15f and plays frames in the clip in this order: 1,2,3,4,17,6,7,8,9... Then it goes to 01:24:15 and partway into another clip does this:
24s:14f
24:15
24:00
24:01
24:16
25:02
24:17 (back to normal)
Both of these clips with these symptoms have a lot of movement (people moving independently in the frame, plus camera movement), but there are other clips with nearly as much movement, and they do not have a problem.
The source footage is AVCHD 720 30p in a matching timeline. I do have some SD footage later in this timeline. This SD footage was captured to the computer via Firewire from a Canon Optura. It is "Scaled to Frame Size" and rendered in the timeline, and is causing zero problems. I exported using the Media Encoder. I am outputting to DVD using the MPEG2-DVD and NTSC Widescreen preset, with the aspect ratio changed from 16:9 to 4:3 and the quality set to 4.5.
I'm running Premiere Pro version 4.2.1 and Encore 4.0 on an Intel Core 2 Duo T9550 2.66 GHz with Windows 7 (64 bit), 4 GB RAM, a 5400 RPM 320 GB hard drive running the OS and the video files located on a USB 2.0 7200 RPM hard drive.
If any of you have ideas, I would be grateful.
Thanks,
Russ

I've been having this problem since installing Snow Leopard with QuickTime 10 way back when and it's caused me real problems with video rendering. I think it's a codec issue as my raw video files play back ok (H.264 codec), but when I export them and save as Photo jpeg or motion jpeg etc the playback has about 4 or 5 seconds of jerky playback near the beginning of the file.
I've just tried opening all my test files with QuickTime v7 and was staggered to see them all run perfectly. It is indeed very annoying.

T520 - 42435gg / Sound stutter and slow Graphic performance with Intel Rapid Storage AHCI Driver

Hi everybody,
I have serious Problems with my 42435gg
Any time I install the Intel Storage AHCI Driver (I've tried plenty of different versions) which is suggested by System Update I experience a horrible Sound stutter and slow Graphic performance in Windows 7 64-Bit.
The funny thing in this case: If the external e-sata port is connected the problems do not occur. If the port is unused again, the stutter begins immediately.
The only thing I can do is using the Windows internal Storage Driver with which I am not able to use my DVD recorder for example.
The device was sent to lenovo for hardware testing with no result. It was sent back without any repairing.
Anybody experience on this?
Kind regards,
Daniel

Did you try the 11.5 RST beta? Load up DPClat and see if DPC conditions are favorable.
What are you using to check graphics performance?
W520: i7-2720QM, Q2000M at 1080/688/1376, 21GB RAM, 500GB + 750GB HDD, FHD screen
X61T: L7500, 3GB RAM, 500GB HDD, XGA screen, Ultrabase
Y3P: 5Y70, 8GB RAM, 256GB SSD, QHD+ screen

Opening a video playback app causes a system-wide stutter...

I've been experiencing a very odd bug, and I can't find anyone else who's had it, let alone had a solution to it.
When I open any app that plays back video (iTunes, QuickTime, VLC, DVD Player, etc.), it causes the display to hang up every few seconds. The hang-up lasts about a second, and persists even after I've stopped playing video and/or closed whatever app caused the stutter. Audio is unaffected, but the entire video output stutters, so you can see it even when moving the mouse pointer, scrolling up/down in a browser, etc. I have to restart to make it go away.
Imagine trying to watch a movie or tv show, and the picture pausing every few seconds, and you can maybe understand how infuriating this is. It essentially makes watching video impossible. As a pro video editor, this doesn't really work for me. Launching Final Cut Pro 7 doesn't cause the stutter to start, but if I launch say, iTunes, before FCP, all video output is affected by the stutter, and I have to restart.
The problem started occurring when I updated Snow Leopard from 10.6.6 to 10.6.7, and has persisted in 10.6.8
I've tried messing with video card settings, Display settings, updating video card drivers, uninstalling/reinstalling Perian, etc., all to no avail.
I would really appreciate any help on this. Thanks!

Anyone?

DPC latency + audio/mouse skip and stutter on t420s

Hello fellow thinkpad owners,
I have a new t420s (41717FU) core i7, 8GB RAM, and NVS 4200M discrete, win 7 64-bit pro. I use the minidock with 2 external 28" displays on DVI out.
I discovered major issues with latency with this machine; very noticeable loss of control for about half a second, plus annoying audio stutter, especially concurrent with network activity. This is quite frustrating, especially for a machine that is supposed to be high end core i7 with discrete graphics. I had a t410s previously and also had latency problems, and I know this is a real problem with several different models (just search 'annoying audio') on the forums.
I have used dpc latency checker as well as latency mon and narrowed the probable culprit to the network drivers associated with the gigabit ethernet. It took me a while to discover the relationship to the Intel 82579LM, since LatencyMon will identify the problem with NDIS.sys or NETIO.sys, giving sporadic latencies over 20000 microsecs, which made me think it was a Win 7 tcp stack issue or maybe some internal windows firewall blocking. During these spikes, the audio stutters, the mouse won't move, everything on the system just stalls for a split second. Temps on CPU seem within normal limits at about 70-80C. I've read everything I could find about this issue, including problems with NVIDIA drivers, ACPI, firewall/antivirus, etc etc, and tried most of those suggestions.
I spent a long time doing all kinds of testing, putting the machine on AC power and max performance, shut down various devices, disabled any component power-off states, disabled NVIDIA and displays, changed bios settings etc.
After all of this, I *know* my issue is related to the Intel Ethernet component, because if I disable it and use wireless connectivity (or no network at all) the problem simply goes away. Surprisingly, the wireless Centrino adapter, though slower, functions without any problem affecting DPC latency and I have no stutter with that (many have previously identified the wireless adapter being a problem especially related to power mgt).
Unfortunately, I require an ethernet connection. So just disabling that adapter is not an option. Here is what I've done to workaround the issue, though I wish it would be fixed for good with some kind of update from Lenovo, though I've called and emailed them and they seem to be ignoring this issue.
**** UPDATE 3/1/2012 ****
SOLUTION RIGHT HERE: INSTALL AN OLDER NETWORK DRIVER FROM HP (sounds crazy, but it works). See below link to driver download.
I (and many other owners of T420, 520, etc - see other posts if you doubt it) have *no* latency after installing this older driver from HP. But as soon as I install the Lenovo-provided driver 11.12.38.* or any later one from Microsoft or the Intel generic driver (intel no longer publishes the old driver), I see *immediate* problems with latency, mouse and audio stutter. But use the driver published by HP (specifically version 11.12.36.0, published 5/4/2011) -- Problem solved! I tested with streaming and browsing for several hours and no spiking or stutter.
Here's where to get the english language download from HP: >> DRIVER DOWNLOAD PAGE HERE <<
Lenovo, PLEASE: this is strong evidence of a faulty driver for those of us with a t420s (and other thinkpad users out there using the intel 82579LM chip under x64). I encourage you to review this solution and engineer an update for the Intel gigabit adapter, or at minimum, roll back to the older driver or some Lenovo approved derivative so it doesn't cause all of us notebook users such a major headache. It's very bizarre that we would need to go to another manufacturer to get a working driver...I was ready to return the machine over this issue!
Aside from that adapter problem, I've been pleased with the t420s performance and features. Thanks again lopiuh for this workaround.
Mojojojo in Austin TX
ADMIN EDIT - Lenovo is testing a beta ethernet driver. If you are willing to try it, please see the link below, and my post on page 6 of this thread. - mark
https://www.dropbox.com/s/llcgjaf45xpuoam/83rw20w1.zip
***** END UPDATE *****
**** OLDER STUFF I TRIED, which somewhat helped, but the real solution is to use the old HP DRIVER above. ******
Basically, my approach was to reduce the 'auto' parameters for the adapter, to reduce the amount of logic running on the adapter itself.
1. Install the PRO set extension tools on this adapter, so you can more easily manage advanced settings. I think Lenovo offers a version in the driver downloads area which adds this management extension, but it is not the standard one offered by the system update utility, and the intel site has a later driver, so I gambled and downloaded the latest version from Intel for this adapter. It installed without issue, but I'm sure Lenovo would prefer you stick with their OEM packages. Anyway, here's the one I used: http://www.intel.com/support/ethernetcomponents/controllers/82579/sb/CS-032239.htm (link near the top for the download). You may want to make a system restore point before you install any drivers outside of OEM approved.
2. Change the default settings for the adapter in Device Manager. Right click properties for the Intel 82579LM in Network Adapters. Change the link speed (if the extension was installed properly, you'll see the intel logo on the tab for Link Speed, and a choice for Speed and Duplex. Change this from 'Auto Negotiate' to whatever speed your network is. I have gigabit full duplex, and that worked for me. This by itself was the biggest improvement with DPC latency.
3. Go to the Advanced tab. I took the approach that I wanted to disable as much 'auto' stuff as possible, and force the adapter to use a particular setting. Thus:
Interrupt Moderation: Disabled
Jumbo Packet: 9014 bytes (I have several devices that can use bigger packets on network, such as readynas)
Performance Options: click properties: Flow control - Disabled; Interrupt Moderation Rate - Off; and then double the receive and transmit buffer sizes (for me this was 512 and 1024 respectively).
I hope this may be helpful to some other owners, but I don't work for Lenovo or Intel so please don't blame me if something goes wrong during your tweaking. This worked (for me) to significantly reduce stuttering problems, though they are not completely gone; your mileage may vary. If you have this same problem, I'd appreciate if you would post about it so I can understand if it is a more widespread problem.
Good luck, mojojojo
Austin, TX
Solved!
Go to Solution.

Hi mojojoj0
For my W520, up till now I do not have latency issues. My set of configuration for Intel NIC is slight different.
2. This may cause connection problems when you are connecting to different network. Different network (switches, routers) have different configuration. Previously I set it to Gigabit Full Duplex, I can't connect to any 10/100 network until I change it back to Auto negotiation.
I would suggest changing back to auto negotiation when you are connecting to outside network, not all places are using gigabit switches.
3. Interesting, I guess I would try it and feedback and see how much improvement for network performance.
From what I know, increasing receive and transmit buffer improve NIC and network card performance, but computer may slightly more memory.
Maybe you can try this, part of my settings:
Large Send Offload (IPv4) & (IPv6) Enabled
TCP & UDP Checksum Offload (IPv4) & (IPv6) Tx & Rx Enabled
IPv4 Checksum Offload Tx & Rx Enabled
Hope this helps!
Cheers
Peter
(Current: W520 4284-A99) (Refunded: W510 4876-A11)
=============================================
Does someone’s post help you? Give them kudos as a reward, as they will do better to improve
Mark it as solved if the solution works for you, so it could be reference for others in the future
Dolby Home Theater v4 (ThinkMix V2)!
http://forums.lenovo.com/t5/W-Series-ThinkPad-Laptops/W520-Sound-Enhancement-Thread/m-p/451401#M155...

Win 8.1 stutter issue with Flash 15.0.0.189

Greetings -
I am having stuttering issues with 2 brand new 8.1 computers running flash.
I've done a fair amount of troubleshooting and I believe it's an issue with Win 8.1 and Flash 15.0.0.189 (I don't know about previous versions.
Running this version of flash on my Win 8.0, HP works fine in both IE and Firefox
Running this version of flash on a new (few weeks old) custom built Toshiba Satellite S with Win 7 preloaded works fine in both IE and Firefox
But then I bought a Best Buy "blue label" Toshiba E45 with windows 8.1 I have stutter with both IE and Firefox.
No updated video drivers, but I reinstalled anyways. Also uninstalled/reinstalled flash as well as Firefox. I also unchecked " hardware acceleration" no difference. Changed screen resolution on my desktop, still had problems
Returned it and bought a Lenovo U430 with Windows 8.1 today...still have stuttering on FireFox and IE
Apps that run Silverlight work just fine.
It seems to me that there is an issue with Win 8.1 with the most recent version of Flash.
If an adobe staff member would like me to test the HP or Lenovo U430 further to resolve the issue, please let me know. I really can't handle all this stuttering. I would really love to help get this resolved asap.
If staff would like an example, Gracepoint on Hulu. The most recent episode The first stutter came in when 24:56 min were left at the show and then 22:55 min left. I then switched over to IE and had stutter with 21:20 left in the show, 17:56 left, and then 17:02 left. But it really is random.

Hey, same problem here. System: ASUS N56JK, nVidia GeForce GTX850M with latest dirver (344.60), Win 8.1, Flash Player version: WIN 15.0.0.189. Browser Opera 25, IE 11.
Video (full screen and window) stutters time to time. Audio is fine. HTML5 works also fine. Tried all possible variants (disabling HW accel., drivers update, browser update etc.) - nothing helps.
Dear Adobe experts, you'd better look on to this issue asap, as it's massive. Can't open a bug report, so write it out here. Can send 'DxDiag.txt' file by request if needed.
Meanwhile will look for Adobe FP alternaitives on Win OS..

Help! Stutter problems with 10.6.8 MacPro early 2008

I'm running 10.6.8 on an early 2008 Mac Pro.
My problem is that recently everything has gone "stuttery" :
• Running a video through Youtube gives a 0.5sec video freeze every 30sec,
• Opening up MacRumors webpages displays the first half of a forum page, then it hangs for 1-2 sec before displaying the rest.
• Scrolling through Finder windows isn't smooth
• Using time machine takes longer than 1 hour to perform even small hourly backups so is in constant use (problem exists even with TM turned off)
* Checking Activity monitor I don't have any rogue processes running.
• Bootdisk still has 275Gb free.
* Logging in to the computer as a new account doesn't give these problems so I'm ruling out a graphics card/hardware/HDD problem.
When I got this computer, new, 4 years ago I used migration assistant to grab the contents off my previous Mac. As a result I have shed loads of stuff on here but the problem only started in the last month. I haven't installed anything I can think of in that time. Due to the above criteria I'm convinced it's something running in the background that's corrupt (Java?) rather than a hardware issue, but with so many files on my system I don't know where to start (and I don't want to erase stuff randomly until it stops!)
Can anyone suggest a diagnostic procedure/app to help track down what's causing this really irritating stutter on my Mac?
Thanks

OK, two things to try:
Do you have Javascript activated (not Java)?
Is your version of Flash Player up to date?
You can check here: http://www.adobe.com/products/flash/about/ to see which version you should install for your Mac and OS. Version 11.4.402.265 is for Snow Leopard onwards.
You should first uninstall any previous version of Flash Player, using the uninstaller from here (make sure you use the correct one!):
http://kb2.adobe.com/cps/909/cpsid_90906.html
and also that you follow the instructions closely, such as closing ALL applications first before installing. You must also carry out a permission repair after installing anything from Adobe.

Fcp video stutter and processor overload

I'm editing on Intel MacBook Pros and on one I'm encountering (after downloading a series of software updates) a slight stutter with Quicktime files played in Final Cut Pro. The other machine is fine (and didn't have the updates). Both run FCP 5.1.4. and the latest Quicktime. Just playing out clips pushes the processors past 100 percent. I've used the disk utility. No other programs are open. Desktop is clean and I've got plenty of hard drive space. Any help?

Both run FCP 5.1.4. and the latest Quicktime.
Does that mean QT 7.4.5?
If so they are not compatible and you will need to go back to a previous version of QT.
Search for "pacifist" and you will find posts to help you

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