You must have done the MacOSX screen capture? That makes these funny 4.24 fps kind of movies.
I\’ve done this before and converted the capture movie to Apple ProRes at 25 fps before using in FCP. My use didn\’t involve audio sync in a any critical way though.
But for a critical audio sync screen capture I used Voila 3.0 and it worked better. Some say Screen Flow or Camtasia is good too.
About the 24fps, if you need 24fps, you need 24fps. I too make it 24fps when needed. In PAL countries we have no use for the odd 23.976 fps. Our film is 24, our TV is 25.
Cinema Tools easily conforms one to the other.
23.976, 29.97, 59.94. All these are numbers that I see in settings in FCP that I’ve very rarely had to use.
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Neil Sadwelkar
neilsadwelkar.blogspot.com
twitter: fcpguru
FCP Editor, Edit systems consultant
Mumbai India