This error means that the input file references audio or video tracks that aren't actually included in the file. So the file itself is just a placeholder that links to these outside media tracks. Since we don't have access to them – they're probably sitting on a user's hard drive somewhere – we can't process the file. To avoid this, be sure to export self-contained Quicktime files that include all media tracks.
Export the Quicktime file as a self-contained Quicktime files that include all media tracks.
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