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How to improve poor video quality in iMovie?

5594 Views 2 Replies Latest reply: Sep 10, 2012 3:23 PM by pomme4moi RSS
pomme4moi Level 1 Level 1 (35 points)
Currently Being Moderated
Sep 9, 2012 6:18 PM

I have a movie in iTunes (version 10.6.3).  When I play the video, the quality is good on my Mac, on my iPad 3 and on my Apple TV.  The Apple TV is hooked to a 42-inch LCD TV.


Next, I open the video file (MP4) using QuickTime Player.  I use the Edit and Trim commands to create a 1-minute segment from the video.  I save the segment from Quick Time Player.  The saved segment is a MOV file.  I drag and drop the MOV file back into iTunes.  When I play it from iTunes, the quality still is good on all my Apple devices - no noticeable difference from the original.


Now, I import the MOV segment into iMovie 11 (version 9.0.8).  At import, I tick the Optimize Video check box and I select the Full - Original Size setting. Once imported, I select Share > Publish To iTunes.  I do not make any changes to the video clip in iMovie.  I publish to iTunes using all five size settings: Mobile, Medium, Large, HD 720p and HD 1080p.  Once in iTunes, I play the video again.  Now the quality is poor, lots of pixelation in all five size settings.


iMovie appears to be doing something to the video to degrade its quality.  Maybe I have a setting wrong somewhere.  Anyone have any suggestions on how to prevent the degradation in video quality?  Thx

Mac OS X (10.7.4)
  • Brad Wright2 Level 3 Level 3 (700 points)
    Currently Being Moderated
    Sep 10, 2012 10:20 AM (in response to pomme4moi)

    What is the size of the video in it's MP4 form?  iMovie may be resizing it to the project settings.  This can be bad as it may produce resizing artifacts.  I would try to export the video as a custom Quicktime movie with the Apple Intermediate codec.  Then play this movie back in the Quicktime player to see if things look fine.


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