What causes pillarboxing to occur part way through a movie?
I might on occasion have been trying different camera modes/actions during a vacation, etc. and somehow get out of 16:9 or ?????????
Main question is what causes pillarboxing in the first place and from there perhaps I can figure out what I have done to trigger it.
Uncheck "iMovie HD/Preferences.../Import/Automatic DV Pillarboxing & Letterboxing".
Check these out from Matti Haveri: