Garbled audio when importing to iMovie

Hello,
I'm having problems with the audio of footage imported from my Panasonic SD600 footage to iMovie '11. Most of it cames out completely useless, either with a constant high pitch noise and no audible remains of the original sound, or with lots of blips over it. Here are the waveforms of a video with each problem:
These videos play OK in Quicktime or elsewhere, so I guess there's nothing wrong with them. Any idea what might be the problem?
Up until now, I tried extracting the audio through VLC, adding the audio track and manually resynchronizing AV in iMovie, but I havent found a practical workflow to recode the audio and switch audio tracks in the original video. In Windows I would use Virtual Dub, but I don't know what alternatives do I have on Mac.
Regards,

Your audio settings may have been changed.
1. Open Audio MIDI Setup (/Applications/Utilities/), then check the Audio Output setting.
2. Change the Audio Output setting to 44100.0 Hz.
3. Quit Audio MIDI Setup.
More info here:
http://support.apple.com/kb/TS1574?viewlocale=en_US
More info on audio missing in iMovie here:
http://support.apple.com/kb/TS2289

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