Much more about 720p24 HDV, Part 2

Published Monday, March 27, 2006

In the last Newsletter, we calculated that 720p24 HDV has an effective 46.8Mbps data rate vs. the 36.9Mbps rate of 720p24 DVCPRO HD. This calculation, which may surprise some, is a reminder that: 1) When an intraframe codec writes a fraction of 50/60fps to a non-tape media, the format’s specified data rate must be reduced by this fraction. 2) You cannot compare inter- and intraframe rate codecs on the basis of their data rates. You must consider interframe rate codec compression efficiency. 3) Intraframe codecs are compared by their compression ratios. 4) Interframe codecs are compared by their ...

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