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Re: What's happened?

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gary adcock
Re: What's happened?
on Oct 26, 2008 at 3:20:09 pm

[Mike Zimbard] " Jeremy can you explain why? I'm trying to understand why a frame would be lost. Aren't you just going from 1920x1080 @25 fps to 768x576 @25fps"

Mike the frame is not lost, but delayed since it takes specific amount of time to pass the signal thru the chips doing the conversions (be they up or down - NTSC or PAL)

Kona Conversions are delayed by 1 frame for continuity (all decks and encoders that handle this type of conversions maintain at least this amount of delay-- some like Terenex are more, with as much as 3-10 frames depending on the image processing required).

This delay is because that signal has to pass thru the additional circuitry needed for the conversions- One frame is necessary since some formats have fields and some frames it had to be tied to the shortest period of time that covers all formats.


make since?

gary adcock
Studio37
HD & Film Consultation
Post and Production Workflows

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