Identifier,Name,Reference
npt,Normal Play Time,[RFC7826]
clock,UTC Absolute Time format,[RFC7826]
smpte,SMPTE Timestamps,[RFC7826]
smpte-30-drop,SMPTE Timestamps 29.97 Frames/sec (30 Hz with Drop),[RFC7826]
smpte-25,SMPTE Timestamps 25 Frames/sec,[RFC7826]