Using the Media Manager with Mixed-Format Sequences
When you process media associated with a mixed-format sequence, keep in mind that
Final Cut Pro bases most of its functions on the frame rate of the sequence, not the
media file. If you are simply using the Media Manager to copy or move a sequence and
its associated media, your media is merely duplicated. However, if you choose options
such as Delete Unused Media or Recompress, you should check your results to make
sure nonmatching image dimensions, frame rates, and codecs did not cause
unexpected results. Processing mixed-format sequence clips with speed changes
through the Media Manager may also cause unexpected results.