Clipping out certain parts of files do work.
But currently, ONLY if the clipping starts from 0:00 of the original file. For instance, if I clip out 30 seconds of 1:00, I have to cut out form 0:00 to 0:30. In this case the plane positions are accurate and good, but if I try and clip out 0:20 to 0:50, the positions are messed up.