When importing a Quicktime file into iMovie the audio is inconsistently synchronised with the video. Any ideas?

I record using Quicktime and the built in webcam on my MacBook Pro. When importing the file to iMovie the audio is inconsistent in its syncronisation with the video. Any ideas?

This is probably caused by the internal webcam on Apple devices being optimized for FaceTime rather than for movie making. In FaceTime, the goal is to transmit the information using a little bandwidth as possible, so the video will be recorded at a variable frame rate. The frame rate will get low if you are still, and will speed up if there is a lot of motion.
To fix, I would suggest that you use a free app like MPEG Streamclip. Drag the clip into MPEG Streamclip and export it out at a constant framerate.
If it is an HD movie, I suggest exporting it from MPEG Streamclip using FILE/EXPORT TO QUICKTIME. Choose Apple Intermediate Codec as your video compression. For sound, choose uncompressed 48khz. That should work, but I can't test it right now. If MPEG Streamclip does not work for you, let me know and I can recommend another free tool.

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    Basic information:
    General
    Format : MPEG-4
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    File size : 78.9 MiB
    Duration : 54mn 44s
    Overall bit rate mode : Variable
    Overall bit rate : 201 Kbps
    Encoded date : UTC 2014-12-10 21:01:49
    Tagged date : UTC 2014-12-10 21:01:58
    Writing library : Apple QuickTime
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    Format : AVC
    Format/Info : Advanced Video Codec
    Format profile : [email protected]
    Format settings, CABAC : Yes
    Format settings, ReFrames : 2 frames
    Format settings, GOP : M=2, N=30
    Codec ID : avc1
    Codec ID/Info : Advanced Video Coding
    Duration : 54mn 44s
    Bit rate mode : Variable
    Bit rate : 63.4 Kbps
    Maximum bit rate : 768 Kbps
    Width : 1 728 pixels
    Height : 1 080 pixels
    Display aspect ratio : 16:10
    Frame rate mode : Variable
    Frame rate : 0.294 fps
    Original frame rate : 25.000 fps
    Minimum frame rate : 0.062 fps
    Maximum frame rate : 50.000 fps
    Color space : YUV
    Chroma subsampling : 4:2:0
    Bit depth : 8 bits
    Scan type : Progressive
    Bits/(Pixel*Frame) : 0.116
    Stream size : 24.9 MiB (32%)
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    Tagged date : UTC 2014-12-10 21:01:58
    Audio
    ID : 2
    Format : AAC
    Format/Info : Advanced Audio Codec
    Format profile : LC
    Codec ID : 40
    Duration : 54mn 38s
    Source duration : 54mn 38s
    Bit rate mode : Constant
    Bit rate : 128 Kbps
    Channel(s) : 1 channel
    Channel positions : Front: C
    Sampling rate : 44.1 KHz
    Compression mode : Lossy
    Stream size : 48.3 MiB (61%)
    Source stream size : 48.3 MiB (61%)
    Expanded information:
    General
    Count : 284
    Count of stream of this kind : 1
    Kind of stream : General
    Stream identifier : 0
    Count of video streams : 1
    Count of audio streams : 1
    Video_Format_List : AVC
    Video_Format_WithHint_List : AVC
    Codecs Video : AVC
    Audio_Format_List : AAC
    Audio_Format_WithHint_List : AAC
    Audio codecs : AAC LC
    File name : OB
    File extension : mov
    Format : MPEG-4
    Format/Extensions usually used : mp4 m4v m4a m4b m4p 3gpp 3gp 3gpp2 3g2 k3g jpm jpx mqv ismv isma f4v
    Commercial name : MPEG-4
    Format profile : QuickTime
    Internet media type : video/mp4
    Codec ID : qt 
    Codec ID/Url : http://www.apple.com/quicktime/download/standalone.html
    Codec : MPEG-4
    Codec/Extensions usually used : mp4 m4v m4a m4b m4p 3gpp 3gp 3gpp2 3g2 k3g jpm jpx mqv ismv isma f4v
    File size : 78.88 MiB
    Duration : 00:54:44.630
    Overall bit rate mode : Variable
    Overall bit rate : 201 Kbps
    Stream size : 5.71 MiB (7%)
    Proportion of this stream : 0.07233
    HeaderSize : 1305394
    DataSize : 81406130
    FooterSize : 0
    IsStreamable : Yes
    Encoded date : UTC 2014-12-10 21:01:49
    Tagged date : UTC 2014-12-10 21:01:58
    File last modification date : UTC 2014-12-10 21:47:04
    File last modification date (local) : 2014-12-10 16:47:04
    Writing library : Apple QuickTime
    Writing library/Name : Apple QuickTime
    Video
    Count : 274
    Count of stream of this kind : 1
    Kind of stream : Video
    Stream identifier : 0
    StreamOrder : 0
    ID : 1
    Format : AVC
    Format/Info : Advanced Video Codec
    Format/Url : http://developers.videolan.org/x264.html
    Commercial name : AVC
    Format profile : [email protected]
    Format settings : CABAC / 2 Ref Frames
    Format settings, CABAC : Yes
    Format settings, ReFrames : 2 frames
    Format settings, GOP : M=2, N=30
    Internet media type : video/H264
    Codec ID : avc1
    Codec ID/Info : Advanced Video Coding
    Codec ID/Url : http://www.apple.com/quicktime/download/standalone.html
    Codec : AVC
    Codec/Family : AVC
    Codec/Info : Advanced Video Codec
    Codec/Url : http://developers.videolan.org/x264.html
    Codec/CC : avc1
    Codec profile : [email protected]
    Codec settings : CABAC / 2 Ref Frames
    Codec settings, CABAC : Yes
    Codec_Settings_RefFrames : 2
    Duration : 00:54:44.630
    Bit rate mode : Variable
    Bit rate : 63.4 Kbps
    Maximum bit rate : 768 Kbps
    Width : 1 728 pixels
    Height : 1 080 pixels
    Pixel aspect ratio : 1.000
    Display aspect ratio : 16:10
    Rotation : 0.000
    Frame rate mode : Variable
    Frame rate : 0.294 fps
    Original frame rate : 25.000 fps
    Minimum frame rate : 0.062 fps
    Maximum frame rate : 50.000 fps
    Frame count : 967
    Resolution : 8 bits
    Colorimetry : 4:2:0
    Color space : YUV
    Chroma subsampling : 4:2:0
    Bit depth : 8 bits
    Scan type : Progressive
    Interlacement : Progressive
    Bits/(Pixel*Frame) : 0.116
    Stream size : 24.9 MiB (32%)
    Proportion of this stream : 0.31508
    Encoded date : UTC 2014-12-10 21:01:38
    Tagged date : UTC 2014-12-10 21:01:58
    Buffer size : 768000
    Audio
    Count : 222
    Count of stream of this kind : 1
    Kind of stream : Audio
    Stream identifier : 0
    StreamOrder : 1
    ID : 2
    Format : AAC
    Format/Info : Advanced Audio Codec
    Commercial name : AAC
    Format profile : LC
    Codec ID : 40
    Codec : AAC LC
    Codec/Family : AAC
    Codec/CC : 40
    Duration : 00:54:38.179
    Source duration : 00:54:38.193
    Bit rate mode : Constant
    Bit rate : 128 Kbps
    Channel(s) : 1 channel
    Channel positions : 1/0/0
    ChannelLayout : C
    Sampling rate : 44.1 KHz
    Samples count : 144567694
    Frame count : 141179
    Source frame count : 141180
    Compression mode : Lossy
    Stream size : 48.3 MiB (61%)
    Proportion of this stream : 0.61259
    Source stream size : 48.3 MiB (61%)
    Source_StreamSize_Proportion : 0.61259

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