Video stutter in very simple video project

My very simple 20 minute travel video, made in iMovie 4.0.1, with less than 10 transitions and extracted audio clips, freezes, stutters, and is impossible to edit. It's my first project in this version of iMovie. I got the program, along with Quicktime 7.11, when I upgraded to OSX 10.3.9.
I've posted before, and added RAM as recommended. Now my computer meets the specs for iMovie 4. It's used for very little else. No external hard drive, no bookmarks, and very few audio clips and transitions. Also tried downloading the updated Quicktime 7.13. Same problem.
When I remove audio clips, stuttering is almost all gone.
I would think this program would be able to handle such a simple project.
Any advice you might have would be appreciated. Should I go back to earlier versions of the programs? Operating system? If so, how do I do that?

Using old hardware with iMovie is a crapshoot, especially with QT 7. On my G4, I had to downgrade to QT 6.5.2 as someone else suggested. I also ran into the problem you did in trying to downgrade. Here is the solution that got me by:
1. Download Pacifist (http://versiontracker.com/dyn/moreinfo/macosx/12743). This will allow you to bypass the downgrade error you received in running the Reinstaller.
2. First run the QT 7.0.1 Reinstaller (this is where Pacifist came in handy).
NOTE: It may be hard to finder this Reinstaller. If you have problems, first try step 3 below using Pacifist, but if that does not work, I can find a way to get you the 7.0.1 Reinstaller.
3. Next run the QT 6.5.2 Reinstaller.
(http://www.apple.com/support/downloads/quicktime652reinstallerforquicktime701.ht ml)
That should allow your project to run smoothly again. Our machines video cards just don't do well with QT 7.
NOTE: Some people don't have the problem we had. I believe our problems are made worse by incremental upgrades of QT.
I hope this helps!

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Ernie -- Thanks. Please see further ... I'm still stymied on one point.
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How are you dragging the Trim frame?
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MERRY CHRISTMAS AND A HAPPY NEW YEAR!
I have very poor video quality after transcoding the video file (MPEG) in Adobe Encore CS5.1. Below you see my used settings in my filmproject.
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Operating System : Windows 7, 64 Bit, Ultimate edition
Source files: MTS files
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Image Size: 1920 x 1080
Frame Rate: 25,00
Source Audio Format: 48000 Hz - compressed - Stereo
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Pixel Aspect Ratio: 1,0
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Video
Image Size: 1920 x 1080
Data Transfer Rate: 25920 kBit / s
Frame rate: 25
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Frequence: 48 kHz
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Please help me soon.
Best regards.

Hi Ann,
1) I did not only „Automatic (based on source)“ options in my tests, but also many other customized options.
The results are very poor. I have done a new test with the following settings. The result is also poor:
Download link: http://www.klavierlehrer-bayern.de/download/test_mpeg2dvd_1.m2v
Export Settings:
Format: MPEG2-DVD
Preset: Custom
Codec: MainConcept MPEG Video, Quality: 5
Frame Rate: 25 fps
Field Order: Upper
Pixel Aspect Ratio: Automatic (based on source)
Render at Maximum Rate: [active]
Bitrate Encoding: VBR, 2 pass
Minimum Bitrate (Mbps): 5
Target Bitrate (Mbps): 9
Maximum Bitrate (Mbps): 9
GOP Settings
M Frames: 4
N Frames: 12
Use Maximum Render Quality: [active]
Multiplexer: None
2) Why shouldn’t I use the “Match Sequence Settings” in exporting? Because of the big output file size?
I used it and the results are very good as I expected:
Download link: http://www.klavierlehrer-bayern.de/download/test_MatchSequenceSettings.mpeg
Export Settings
Match Sequence Settings [selected]
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User Maximum Render Quality: [active]
3) I tried also Dynamic Link in PremierePro (to Encore).
The results are also poor.
4) I will test also LagarithLoslessCodec and frameserving +DGMPGDec. But the video is vertical long drawn-ot.
I think I did not use it correctly.
Regards

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I just reinstalled OS X 10.5 and still have the same problem. I would say it gets worse and worse. Last thing that happened was I was playing World of Warcraft and the computer just started to stutter, mouse, video, sound, everything an then it shut down. After reboot i got this error report:
Mon Nov 17 22:06:38 2008
panic(cpu 1 caller 0x0019CCE4): "simple lock deadlock detection: lock=0x5356a0, cpu=1, owning thread=0x8400048"@/SourceCache/xnu/xnu-1228/osfmk/i386/locks_i386.c:317
Backtrace, Format - Frame : Return Address (4 potential args on stack)
0x2e5fcdd8 : 0x12b0e1 (0x4555b4 0x2e5fce0c 0x133238 0x0)
0x2e5fce28 : 0x19cce4 (0x45cad8 0x5356a0 0x1 0x8400048)
0x2e5fce48 : 0x13393d (0x5356a0 0x340b7000 0x8eabf020 0x109)
0x2e5fce88 : 0x13fd3c (0x340b7000 0x39d78b8 0x1f3a0 0x3bc6bb4)
0x2e5fced8 : 0x199303 (0xa10dc680 0x109 0x39d65d0 0x0)
0x2e5fcf28 : 0x1a6c55 (0x0 0x2e2d75cf 0x0 0x191926)
0x2e5fcf78 : 0x1ae60e (0x45defc60 0x340b7000 0x2e5fcfa8 0x6)
0x2e5fcf98 : 0x4443c7 (0xde 0x45defc60 0x39d65d0 0x1)
0x2e5fcfd8 : 0x19e6de (0x45defc60 0x0 0x0 0x0)
0x45defd08 : 0x2e2d592d (0x4292400 0x14 0xf 0xc)
0x45defd48 : 0x2e2d6e52 (0x3d3f200 0x0 0x1 0x3d3f600)
0x45defd68 : 0x2e2d4360 (0x3d3f200 0x2e2d0740 0x9f3fd20 0x3d3f600)
0x45defda8 : 0x2e2ca312 (0x3d3f600 0x0 0x3d3f600 0x1991a6)
0x45defdf8 : 0x2e2c985d (0x3d3f600 0x45defe6c 0x45defe28 0x8c499620)
0x45defe38 : 0x2e2d3bb9 (0x3d3f600 0x45defe6c 0x45defe88 0x13ff64)
0x45defe98 : 0x2e2bd8b8 (0x3d3f600 0x429b920 0x1 0x45defee0)
Backtrace continues...
Kernel loadable modules in backtrace (with dependencies):
com.apple.driver.ACPISMCPlatformPlugin(3.0.0d11)@0x2e2d1000->0x2e2dafff
dependency: com.apple.iokit.IOPCIFamily(2.4)@0x2e318000
dependency: com.apple.driver.AppleSMC(2.0.0d5)@0x2e2ba000
dependency: com.apple.driver.IOPlatformPluginFamily(3.0.0d11)@0x2e2c3000
dependency: com.apple.iokit.IOACPIFamily(1.2.0)@0x2e32e000
com.apple.driver.IOPlatformPluginFamily(3.0.0d11)@0x2e2c3000->0x2e2d0fff
com.apple.driver.AppleSMC(2.0.0d5)@0x2e2ba000->0x2e2c2fff
dependency: com.apple.iokit.IOACPIFamily(1.2.0)@0x2e32e000
BSD process name corresponding to current thread: kernel_task
Mac OS version:
9A581
Kernel version:
Darwin Kernel Version 9.0.0: Tue Oct 9 21:35:55 PDT 2007; root:xnu-1228~1/RELEASE_I386
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mr
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