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i have inserted a high frequency audio (more than 18000Hz) into a Movie, it is to test if children can hear that frequency during my video presentation. However, iMovie does not allow anything above a certain frequency to be exported.

I have tried exporting as Quicktime: I used the following sound settings

Linear PCM

but when i click on preview and use a sound analyzer, it still doesn't detect the frequency.

Someone please help

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which version of iMovie? –  Stu Wilson Apr 6 '12 at 16:10
iMovie '11 is the current one i'm using –  zerlphr Apr 6 '12 at 16:38

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