Some Audio Missing from Exported Movie

I've exported a movie from iMovie to iTunes for sharing with AppleTV but the sound is missing from the last 75% of the movie when played back in Itunes or AppleTV. All the sound is ok in the iMovie project so some of it appears to have gone missing when exporting to iTunes.
I have tried re-exporting it but it's still the same result.
Any help would be appreciated.
Regards
Joe

Like everyone else here, I'm just an iMovie user who volunteers to help answer questions.
Unfortunately, recent changes to the Discussion software introduced bugs that make it very difficult to reply to user questions. Despite assurances by Forum administrators, these bugs are not being fixed.
This is to ask that you contact Apple, suggesting that additional resources be allocated to fixing the Discussion software. Hopefully your support will encourage Apple to address these problems.
Here's the man who should be able to get some action:
Steve Jobs <[email protected]>
I plan to include this message in postings until the issues are resolved.
Joe, I've also seen problems exporting iMovie projects with the Apple TV exporter, although never the problem you mentioned.
I suggest you try another way to configure your own export settings. Your goal will be to create an export very similar to Apple TV, but build it on your own. The Apple TV exporter uses the H.264 codec, used for many other exports too.
(You can test this on one or two clips in the affected area before exporting the entire iMovie project. Use the "Share selected clips only" checkbox.)
Instead of choosing the Apple TV export in the export dialog window, try choosing "Movie to MPEG-4". Then click on the Options button. Configure these settings:
UNDER THE VIDEO TAB:
Video Format: H.264
Data Rate: 2653
Optimized for: Download
Image Size: Custom, 720x480
Frame Rate: Current (or 29.97 for NTSC, 25 for PAL)
UNDER THE AUDIO TAB:
Audio Format: AACV-LC (Music)
Data Rate: 128 kbps
Channels: Stereo
Output Sample Rate: Recommended
Encoding Quality: Better
When the export is done, change the file extension to ".m4v", the extension used by Apple TV, if you like. You'll want to test the movie in whatever ways you now use the traditional Apple TV movie.
Karl

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