I just finished editing a video in which I detached and removed all of the original in-camera audio (clip by clip) and added an AAC music track to play over the whole video. I've produced several videos like this before without any trouble. But this time for some reason "phantom" audio from the original clips are popping up in the output. When I play the movie in the iMovie '09 viewer everything is fine. But when I export it these bits of video are still there. I went back through and verified that all of the clips are muted. Yet I cannot find where this remnant audio is coming from. Stranger still is that the audio that is playing is not matched up with the clips it came from. Am I doing something wrong? Is this a glitch or a known issue since the last update?
Did you use custom slow/fast motion in this video as opposed to your other ones? There is a bug in iMovie '09 that can cause loss of audio sync and the "phantom" audio bits you describe when using custom slow/fast motion. This has been experienced by many users. See for example this thread:
I detached and deleted the audio track from each of the clips I used before I laid down my music. Again, everything played fine in the iMovie app window. Post-export was a different issue.
Thanks for pointing out this link. What I ended up doing was to import the Quicktime file that I exported, deleted the bad audio track, and then laid in a fresh music track and re-exported. Seemed to be a good work-around.