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576i component video
This chapter details the scanning, timing, sync structure, and picture structure of 576i25 (625/50/2:1) video. The scanning and timing information here applies to all variants of 576i25 video, both analog and digital. The sync information relates to component analog, composite analog, and composite digital systems. I assume that you are familiar with 480i component video, described on page 445.
Frame rate
576i video represents stationary or moving two-dimensional images sampled temporally at a constant rate of 25 frames per second. For studio video, the tolerance on frame rate is normally ±4 ppm. In practice the tolerance applies to a master clock at a high frequency, but for purposes of computation and standards writing ...
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