2 Replies Latest reply: Aug 3, 2009 6:47 PM by Beverly Maneatis
three1ne Level 1 Level 1 (0 points)
Hi everyone. I have a 10 minute video. Its 35gb and ive recently started adding sound effects. Just recently the audio has started to stutter quite badly. Its slightly different everytime so it isnt directly related to the individual sound clips. I ran Activity Monitor while I was playing back the film and iMovies was using up 165% of my CPU. Is this normal? Im hoping that this is the problem and that when I convert my project to a quicktime file it will go through without any problems.

Does anyone have any idea if this is the case?

Macbook Pro 15in, Mac OS X (10.4.11)
  • Bengt Wärleby Level 6 Level 6 (19,450 points)

    Any ideas - YES

    Main one - free space on Internal BOOT hard disk (other doesn't count)

    My minimum is 25Gb free space to let Mac OS (UNIX) and iMovie get space to run.


    Many audio clips (and video) eg > 50 - this is a known problem and is dealt with
    by mixing down audio to one audio clip.
    This is done like this
    • Export out as QuickTime Expert mode and as .aiff audio file
    • Move over audio-clips to one of the audio tracks (It doesn't matter if You stack
    them above other audio-clips)
    • Import the new .aiff audio file to the empty track
    • Silence the other two

    Play - Nice and no stutter (IF free space is large enough)

    Third thing.
    • No other application running in background eg internet etc.

    Yours Bengt W
  • Beverly Maneatis Level 5 Level 5 (7,150 points)
    I have had stuttering problems when my iMovies get to be complicated usually with many clips (audio or video), or if the size becomes fairly large. I have created iMovies that have ranged in size from 6 GB to over 100GB! 35 GB seems a bit large for a ten-minute movie. Do you have lots of clips/sound effects?
    What is your ultimate desired result for this movie?

    I have found that I can continue editing as if nothing is wrong and the ultimate results are fine. However, I have not been uploading my movies to any websites, so I cannot address that.

    I do export as Full-quality QuickTime when I am nearly finished editing. I recommend adding music last. If I find the movie is already stuttering in playback before I add any music, I still export it as QuickTime. I then open a new iMovie and drag the newly created quicktime version into the timeline. I then add my music and usually my movie plays without stuttering in this new iMovie.
    I have also found that the first version will result in an burned DVD that plays correctly without stuttering, but I usually create my iDVD projects using the QuickTime version.