I get no sound from mp4 in imovie 10

I am trying to import an mp4 file (sourced from a Go Pro) in to iMovie 10. The file does not play any sound in IMovie. It does play sound in every other video app I have (Quicktime etc).
I have googled around looking for fixes but cant find anything that will work. It would appear that iMovie 10 cannot deal with MP4....surely that cant be true ?

1. Reset PRAM.  http://support.apple.com/kb/PH4405
2. Reset SMC.     http://support.apple.com/kb/HT3964
    Choose the appropriate method.

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