You hardly need to concern yourself with Progressive Segmented Frame.

You may have seen master tapes from post production facilities labeled with 1080 23.98PsF or 1080PsF instead of “23.98p.” For practical purposes this designation does not change a thing. If a network requires a 23.98p delivery (they may erroneously call it “24p”) what they really mean is a 23.98PsF tape.

Progressive segmented frame was developed to be compatible with legacy video electronics which are not designed for use with progressive signal. PsF also reduces apparent flicker at 23.98fps which is a low frame rate.