Video playback stutters in small viewer

When I start playing an event or project in the small viewer window in iMovie 11 (at the top right of the screen), the video plays for a few seconds then stops, then plays some more, and pauses again. It keeps stuttering during playback. The strange this is, when I play back in full screen mode (command-G), it plays back smoothly without interruption. The video source is a DV file. It used to play back just fine in the small viewer, but then something happened. My iMac is a quad core and plenty fast enough. Any ideas?

easy answer first: your audio properties do not
match your sequence audio properties, hence the need
to render. if you're working with mini dv, the audio
should be sampled at 16 bit 48k but as you've a
problem, i'll surmise that you're not using the easy
setup to capture and set up your project.
I did the capture awhile ago. I don't think I did anything unusual, but I can't guarantee I didn't. See my answer above to Jim Cookman. If I did, I'm not seeing what it was - nor, more importantly, how to resolve it. Would batch-processing the clips to reconvert the sound in some way be appropriate? If so, any ideas what I would convert to?
it would be helpful if you would go into more detail
about your set up. none of us can look over your
shoulder. where's this media stored? system drive
or another hard drive? if another hard drive, is
that an internal or an external hard drive? if it's
external, how do you have it connected; firewire or
usb? if it's firewire, what else shares the firewire
bus? if it's usb, stop using usb!
External Firewire 400 drive - 4th and last on a chain.
what have you done to your computer recently?
I keep it upgraded with normal Software Update changes. Got the new version of FCP (5.1) a couple months back and it's upgraded to 5.1.4. I don't think I've done anything else out of the ordinary.
Of course I don't want to rule out anything - but the clips play back fine in the Canvas and in QT, so I'm skeptical it would be a hardware issue.
Thanks - I appreciate your interest and help.

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Audio and video playback stuttering...sometimes

I'm having issues with audio and video playback stuttering at times in several applications. It's the same kind of skipping or stuttering in each application, whether it's iTunes (version 10) or YouTube or Netflix (Safari). I can also hear it when I'm just adjusting the volume via the keyboard, the "clicks" stutter.
I'm not running anything other than iTunes and Safari at once, the iMac has 2 gbs of RAM, it's running Snow Leopard. It also will work sometimes for a while. I just can't figure out why it will work sometimes and not others. Any ideas about what the cause may be? Quicktime X have anything to do with it?

video playback stuttering at times in several applications.
Quicktime wouldn't work either.
Until you max out your ram, you are pretty much stuck between a rock and a hard place. In the meantime, make sure you have the latest versions of
Adobe Flash Player
Flip4Mac
VLC Media Player
Perian
Movist
I'm noticing that in general it's running extremely slowly now, even with only the browser running.
Disconnect all peripherals from your computer. Boot from your install disc & run Repair Disk from the utility menu. To use the Install Mac OS X disc, insert the disc, and restart your computer while holding down the C key as it starts up.
Select your language.
Once on the desktop, select Utility in the menu bar.
Select Disk Utility.
Select the disk or volume in the list of disks and volumes, and then click First Aid.
Click Repair Disk.
Restart your computer when done.
Repair permissions after you reach the desktop-http://docs.info.apple.com/article.html?artnum=25751 and restart your computer.

Browser to flash HD Video playback stutters on Atom-ION based PC

When ever I try to play video in hd, the video playback will stutter. Meanwhile Xbox Media Center can all three videos just fine using the appropriate free video plug-in.
Can the Adobe Flash Player be fixed and optimized to play videos with smooth playback, on the Atom-ION PCs.
Xbox Media Center (Download Free)
http://xbmc.org/download/
Visual Design Of A Photograph - B&H
https://www.youtube.com/watch?v=o9RQ6YPVWhA
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http://vimeo.com/42806211
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HULU
http://www.hulu.com/
http://www.zotacusa.com/zbox-hd-id34-blu-ray.htm
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CPU Integrated
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Chipset
Intel® NM10 Express
Cooler Type
Fan (Single Slot)
Onboard Video
Next Generation NVIDIA® ION™ (w/512MB DDR3 memory)
Onboard Audio
Onboard analog stereo high-definition audio/ 7.1-Channel LPCM digital audio (HDMI)/ Optical Digital S/PDIF audio output
Onboard LAN
10/100/1000Mbps, WiFi 802.11n/g/b
Memory Size
1 x 2GB Installed (Up to 2 x 2GB)
Memory Slots
2 x 200-pin SO-DIMM
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DDR2 800 SO-DIMM
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800 MHz
OS Name
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Can you say even more about what it is you want to do? I mean, what will the application do, not what are the technical aspects of how it will work?
For a point of comparison, look at this thing I did:
http://www.cartoonnetwork.com/mixit/
If you try out the Make page, both the template ones and the from scratch one, as well as the View page to see the playback unit in action. Is what you're going to do anything like that?
I have tried the playback part of this as a mobile app, and it so very nearly works ok! Amongst the many problems are that the overall data rate needed is quite high, and mobile devices aren't as consistant or high bandwidth as desktops, the external swfs often need code in them, so that rules out iOS, and to do the layering involved rules out H.264.
At some future time there will hopefully be StageVideo that can use H.264, but I don't know when that will be, or whether it will be responsive enough (FLV is much faster to connect to and play than H.264).
Incidentally, even in the Objective-C world you can't lay things on top of the standard iOS H.264 player. To do that you have to use the AV Foundation class, so it's fairly low level programming. Using FLV in Flash is a lot easier!

Apple TV video playback stutters - even with SD

Hi,
i don't know what i am doing wrong, but i have some serious video playback troubles with my new atv:
All files start to play fine, but somehow - like every few seconds - the movie seems to stuck for a very short time - just an eyeblink. it looks quite the same when you play a HD Movie on a computer and the CPU is not really capable of playing back this files...
it doesn't matter if the video files are on the internal drive or streamed over wlan - same problem...
i'll tried lots of different software for the video converting: visual hub, handbrake, quicktime pro... always the same problem...
The strange thing is - all apple trailer movies playback just fine!!! even in HD - smooth as butter...
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Thanks - Matt
my setup:
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720p - 60Hz
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Samsung Le-40a557p2 LCD-TV
Sound via optical cable from aTV:
Sony DAV-IS 50

Assuming you're using conservative video encoding and not pushing things to the limit, I'd say something is probably amiss with the AppleTV.
If you were just streaming I'd look at the network first of all, but you say it hapens with synced files too.
Assuming you've pulled the plug and rebooted at some stage, I think I'd do a system restore (which will delete all media so make sure any purchases are transferred first), and if it was still an issue, then I'd get the new AppleTV replaced.
Occasional glitches happen but they shouldn't happen all the time.

HD (High Definition) Video playback stutters and there is lag

When I play HD content on my Macbook the video stutters alot, although the audio is fine. Thus I basically cannot watch HD movies.
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YouTube playback is going to be limited by your internet connection speed more than anything else, so I wouldn't use that as any test for HD playback. Besides, YouTube is running on Adobe's Flash technology which is notorious for its poor performance.
You say you are having problems even with .m4v files but where did those files come from? Can you try the Disney video clip ("Earth" HD 1080p preview) I mentioned earlier since I know that it works well on my MacBook. If you are playing files that have been encoded by just any user with just any third-party tool then I'm not certain that you can use those as a test either (since some files that you will find on the internet will be encoded, well, just badly).
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Have you tried running with _all_ peripherals disconnected and with networking/WiFi/Bluetooth disabled?
Have you confirmed that you don't have a memory or disk "hog" that is running in the background? How about checking for any high-CPU loads that are running in the background? Have you used Apple's Activity Monitor in the show "All Processes" mode (with a sort on % CPU)?
Here is what I see in Activity Monitor while viewing the "Earth" HD preview in the QuickTime Player on my 2.0GHz MacBook (with only the QuickTime Player and Activity Monitor applications running):
Activity Monitor: All Processes Sorted by % CPU
QuickTime Player     27.6 (% CPU)
WindowServer            6.2
Activity Monitor         5.9
pmTool                      2.9
kernel_task                 1.9
Finder                         0.0
<and many more all running at 0.0>
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Here is the System Memory data from Activity Monitor (this was taken immediately after a restart of my MacBook but while playing the HD video in QuickTime Player):
Free 1.3GB  (this will vary with the amount of installed memory, my MacBook has 2GB SDRAM)
Wired: 162MB
Active: 255MB
Inactive: 9MB
Used: 426MB
VM Size: 30GB
Page ins: 85MB
Page outs: 0 bytes
Swap used: 0 bytes
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Under Activity Monitor's Disk Activity you will see a lot of variation (up and down in the Data read/sec) while the movie is playing but generally you should stay in the low, single-digit MB/sec range (e.g. 2.1MB/sec). The range will go from only a few hundred KB/sec to maybe (rarely) up to something like 6MB/sec. However, Data write/sec should be very low on average (actually around zero).
Next download the AJA System Test application and check your hard drive performance (it's a free download from http://www.aja.com/products/software/ ). When running the AJA benchmark you should be seeing transfer rates that are consistently and steadily in the 40 to 50MB/sec range. AJA System Test allows you to watch the transfer rates in a graph so you can look for unexpected "stalls" in the hard disk access and transfer rates. To test for long period transfers increase the File Size option to something over 1GB. You may want to run this test several times while you have nothing else running on your MacBook. You may see a few brief but significant drops in the I/O Transactions rate but generally both the read and write rates should stay quite close to 50MB/s. If you don't see numbers like I've noted above then you may have a hard drive issue (either hardware or software or some background task that is using your disk even when you don't know it).
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Hi all,
I'm having problems with Quicktime playback of Interlaced video. For testing purposes, I'm playing back a PAL 20 second h.264 clip on a secondary display attached to my MacBookPro with the Apple DVI-S-Video adaptor (set to 720x576 interlaced PAL 50Hz).
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I'm on Leopard with the latest updates.. I desperately need to find a fix for this ASAP as I have a tradeshow install in a couple of days time.. Any help would me most appreciated.
Thx

I've never tried how well interlaced material transfers from the Mac directly to an interlaced TV...
But I do know that feeding interlaced .dv from iMovie (in passthrough-to-camcorder mode) via FW a a TV is fine. Or burn it to avideo-DVD via iDVD and use a standalone DVD player to present it.
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On the iPad, close any open windows so you see the "favorites" screen, then you should see the Private link at the lower-left of the screen. For the iPhone, see:
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I recommend getting a SIM card from the Three network in England, they have great EU roaming rates and free like-home roaming in Italy.
Set your phone's region to match the country you're in, it'll save from some headaches when calling local/international numbers.
To answer your questions,
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3. If husband has an iPhone also, you can chat with iMessage/Facetime, just give him heads up about the new number you'll have. Otherwise, use Whatsapp if he's got an Android. You can activate Whatsapp with your American number or the international number if you choose to get a SIM in Europe.
Also, Get the MagicJack app and/or Google Hangouts, both of those apps provide you with free calling to the USA and Canada using any internet connection. Google Voice is another good way to SMS across the seas.
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Video playback in ALL applications stutters while using battery only.

Video playback in ALL applications stutters while using battery only. All OK when running from power adaptor. New battery did not fix. Recently updated iTunes to 11.0.5 and Flash player 11.8.800.94 .

Thank you again andyBall_uk.
I have successfully run Apple Hardware Test and it returned the error code...
4SNS/1/40000001:VPOR
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I have had a non operative optical disk drive for a year or more but the fault with the video only developed in the last week or two. Could the "O" in VPOR refer to the Optical drive?
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OK, I did a couple of things and ran things a couple of times.
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I went ahead and enabled jumbo frames on the rest of the computers on the network just in case.
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I am going to have to go to the Netgear forums to see if i can figure this out. Hopefully, I can get things going to be able to help some people out.
If anyone has any ideas, they would be greatly appreciated.
My only other alternative is spending $2000 for the thunderbolt capable NAS that Apple sells - it's only money!
Cesar

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I cannot see the video playback through my camera when I press the space ba

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Hi,
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View > External Video > All Frames. and
View > Video Playback > Apple Firewire PAL/NTSC.
Sandeep

Video playback stutters in small viewer

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