scope:

This part of IEC 574 specifies the minimum requirements for recordings on the leaders and trailers of video recordings to assist users to adjust equipment for optimum performance prior to the start of recorde programme material. It also specifies the audio and video information that precedes and follows the recorded programme material to ensure proper identification of the programme and to allow proper cue-up and exit from the programme. The signals recorded on the leaders and trailers are not intended as test signals for the measurement of the performance of a system.