[opendtv] Re: HD vs. 625 vs. 525 vs. 405

There are two fields in NTSC.  So it's not 525 - 21.  It's 262.5 - 21 
and 262.5 - 20.5.  That's 483.5, which is rounded to 480 for computer 
(and MPEG macroblock) convenience.

TTFN,
Mark


cbenham@xxxxxxxxxxx wrote:

>I'm confused.
>525 lines minus 21 in the VBI (I'm including line 21 because today it's
>used for closed captioning) 
>equals 504 lines. Where are the other 24 lines
>going which reduce line count to 480?
>
>  
>



 
 
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