Import MPEG1 Muxed Problem - No audio

I am attempting to import some video clips that have been save to disk in the "MPEG1 - Muxed" format (according to Get Info).
The clips play perfectly in Quicktime - video and audio.
When I import them into iMovie, however - NO SOUND. Video is fine.
Are there any tricks I need to know for importing these clips? Not that it matters, but they are long (about an hour each - 6 of them) and about 1.2 gig each.
Thanks in advance.

OK - I have downloaded Streamclip. There are many choices for conversion. I am not going to do anything fancy in iMovie - I just need to edit the clips. For example, I do NOT need to alter the audio in any way - I just want the audio to stay synched with the video as I cut various snippets.
So of the many choices in Streamclip - which would be best?

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Take a look at MPEG Streamclip and see if it can convert your MPEG1 into DV Stream (which iMovie likes). It's free and I've found it to be very useful (but haven't used it for your challenge).
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When importing clips to iMovie11 the audio is missing. I have been able to successfully to this in the past and all of the sudden it is not working. Any help to solve the problem would be appreciated.
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Download/install an app is a know possible solution.
3. Install another app from the App Store
If all user-installed apps are not launching, it could be an Apple ID authorization issue. Download and install an app that isn't already installed on your device to reset this information.
Note: If you have installed apps using multiple Apple ID accounts, you may need to perform this step for each account.
Above from Apple's :
iOS: Troubleshooting applications purchased from the App Store

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Import MPEG1 Muxed Problem - No audio

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