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How to synchronize audio and film

251 Views 2 Replies Latest reply: Jun 23, 2013 9:23 PM by Bengt Wärleby RSS
pikem Calculating status...
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Jun 23, 2013 10:23 AM

I have digitized several analoge films without any problem in I movie. Sudenly my audio is not running at the smane speed as the film. Audio is running faster.

How can i synchronize that??

iMovie '11, OS X Mountain Lion (10.8.4)
  • Klaus1 Level 8 Level 8 (43,470 points)
    Currently Being Moderated
    Jun 23, 2013 3:31 PM (in response to pikem)

    iMovie 6: Improving audio and video synchronization



    iMovie 11:


    This tutorial video may help:



    Also, this User Tip offers a possible solution:


  • Bengt Wärleby Level 6 Level 6 (18,950 points)
    Currently Being Moderated
    Jun 23, 2013 9:23 PM (in response to pikem)



    Sudenly my audio is not running at the smane speed as the film.


    Can it be so that material used is in one frame rate (fps = frames per second) and Your movie project in another ?

    • NTSC = 29.97fps (standard in USA (and more) and on many Cameras)

    • PAL = 25fps (standard in EU (and more))


    Same goes for 50i and 50p and 60i and 60p.


    iMovie doesn't handle 50p or 60p as standard (as far as I know) but material need to be converted to 50i or 60i first.


    Then I use JES_Deinterlacer to convert from 25fps to 29.97fps - when I need to do a NTSC-project.


    fps in Your project You see here (in Project window)

    Skärmavbild 2013-06-24 kl. 06.16.56.png

    first ona at 24 bildrutor = 24fps (frames per second) (why it became this I wonder )

    next 30fps (NTSC)

    last 25fps (PAL)


    Mixing material with different fps - can in MY CASES result in Audio (out of sync./drift)


    Yours Bengt W


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