Imovie 5.0.2, Stuttering playback and out of synch audio with visual.

I have edited a movie on Imovie HD 5.0.2, it is about 50 mins long. When I came to record back onto my Sony DCR-HC42E camcorder (I don't have a combo drive on my Imac) the playback is not acceptable. It stutters, freezes and after a while the audio becomes out of synch with the visual. The playback is generally not smooth enough either. I have updated to the latest operating system. I have chosen standard quality playback from the preferences option and am very frustrated at the poor results.
I have 20 GB of space left on the computer.
If anyone can suggest a solution I would be most grateful.
Mark
1 GHz PowerPC G4 Mac OS X (10.4.6) 256 MB DDR SDRAM

Mark, if your Mac has just 256MB RAM it's possible adding more RAM will improve playback and your export to the camera. I wouldn't bet on it, but it's certainly worth a try. (You need more RAM anyway, so it's a good idea nevertheless.)
There may be another way to successfully export your project to your camera. Even projects that "stutter" when played in iMovie often export correctly to QuickTime. (The export to QT is not time sensitive, unlike the export to the camera.) You should be able to export your project to a Full Quality DV movie, one of iMovie's built-in export options. Exporting to QuickTime "flattens" the movie, making it easier to play.
You would then import THAT movie to a new iMovie project. That project will probably export successfully to the camera.
You may want to test this by exporting the first few minutes of the project. (To export a group of clips instead of the entire project, select them and use the checkbox button "Share selected clips only" that you'll see in the export dialog.)
You're running low on disk space, so here's a trick to avoid iMovie having to make yet ANOTHER copy of the Full Quality movie when importing it. The movie will be about 12GB; it won't be small.
Instead of importing the Full Quality movie to a new project, create the new iMovie project, Quit iMovie, open the project package (Control-click on the project icon and choose "Show Package Contents" from the popUp menu) then drop the Full Quality movie into the Media folder. Re-open the project. The Full Quality movie appear in the iMovie trash. Open the Trash window and drag the clip to the Timeline. Save, then export to your camera.
Karl

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