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Aside from the line count being different, converting to a format that requires 60 fields every second from a format that has only 50 fields poses difficulty. The NTSC standard is temporally and spatially incompatible with both PAL and SÉCAM.

PAL and SÉCAM use 625 lines at 50 fields/s or 25 frames/s.

Perhaps the most technically challenging conversion to make is the PAL and SÉCAM to NTSC conversion. Until the 1980s, standards conversion was so difficult that 24 frame/s 16 mm or 35mm film was the preferred medium of programming interchange. The problem got worse with the introduction of color standards PAL, SECAM (both 625 lines), and the French black and white 819 line service. The first known case of television systems conversion was in Europe a few years after World War II, mainly with the RTF (France) and the BBC (UK) trying to exchange their black and white 441 line and 405 line programming. One of the most common conversions is between the NTSC and PAL standards. Typically video is fed into video standards converter which produces a copy according to a different video standard. However, the international exchange of television programming makes standards conversion necessary so that video may be viewed in another nation with a differing standard. Television standards conversion is the process of changing a television transmission or recording from one video system to another.Ĭonverting video between different numbers of lines, frame rates, and color models in video pictures is a complex technical problem. ( Learn how and when to remove this template message) ( August 2010) ( Learn how and when to remove this template message)

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