History
The first known case of TV systems conversion probably was in Europe a few years after World War II – mainly with the RTF (France) and the BBC (UK) trying to exchange their 441 line and 405 line programming.
The problem got worse with the introduction of PAL, SECAM (both 625 lines), and the French 819 line service.
Until the 1980s, standards conversion was so difficult that 24 frame/s 16 mm or 35 mm film was the preferred medium of programming interchange.
Read more about this topic: Television Standards Conversion
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