Audio Garbled During Transitions & FX (MPEG)

I use 2 different cameras for taking home movies: A sony digital camcorder, which records in DV; and a sony digital camera, which records MPEGs. Importing and editing .DVs from the camcorder is always problem-free. With the MPEGs, however, I have to jump through a few hoops first (copy the MPEGs out of iPhoto, convert the MPEGs to .DVs using MPEG Streamclip, import the new .DVs to iMovie). So far so good. Now I can make my movie.
Except... When I add a transition or a title, the sound becomes garbled, but only for the duration of the effect. Otherwise, the sound is fine. I tried extracting the audio, but then all the audio becomes garbled. And by garbled, I mean that "helicopter" sound like others have described.
Any ideas?
Thanks.
P.S. Here's links to 2 movies I created with iMovie; the 1st one was from the camcorder (.DV):
http://homepage.mac.com/ron.wood/iMovieTheater61.html
the 2nd one was from the digital camera (MPEG), you can hear the garbled sound when the titles show up (there's some background wind noise, but the garbled sound is there, if you listen for it):
http://homepage.mac.com/ron.wood/iMovieTheater87.html
Powerbook 1Ghz Mac OS X (10.4.5) 1 GB RAM

Hi
I own a 1.83 GHz Intel iMac and have been using iMovie for years. I've been working on a particularly large file (a compilation of best clips from 12 years worth of video of my children). The file is 42 GB. Everything was fine until I opened the file about 2 weeks ago and the audio had the aforementioned helicopter-like garbled sound. Not just a single track but all the video was garbled! After panicking a bit I found this thread. I'm not a power mac user so much of the advice I encountered in this (and other) threads was over my head. I did export the file to Quicktime from within iMovie (Share, Quicktime) and the audio did work. And then I happened onto the solution: I removed all of the transitions between the video clips (I used the cross-dissolve transition between most of the 605 clips) and my audio returned to normal. Upon finding the solution I recalled that one of the last things I did when I had last worked on this particular iMovie file was to add some transitions. Perhaps there is a maximum in terms of transitions that a particular file can handle? Or perhaps iMovie doesn't like having transitions in certain places (for example, between iMovie's built in theme clips and video clips)?
In any case, problem solved. Hope this helps somebody else who encounters the mysterious garbled helicopter-like audio.
Paul

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Author:   [email protected]
Date:     2010-01-06 16:19:04 -0800 (Wed, 06 Jan 2010)
Log Message:
Fix to allow Animate to automatically handle changes in styles during transitions. This same logic already works for properties (e.g., if you specify different values for x in states and run Animate with a SimpleMotionPath with property="x" then it will automatically determine the from/to values to animate for x). But we needed to add an override for getRelevantStyles() for Animate to advertise the possible styles to pick up changes for so that the transitions array would be populated accordingly.
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Reviewer: Jason
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Audio Garbled During Transitions & FX (MPEG)

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