[Tig] drop frame and HD

Michael Poimboeuf mkp
Wed Mar 16 21:04:40 GMT 2005


Jack,

All of the "i" numbers you asked about in your mail are vertical field
rates, and the vertical rates are the same regardless of differences in
SD/HD horizontal line rate/resolution. Drop and non-drop apply the same
way they always have.

"And. where exactly does 23.98 fit into all of this?" - In my experience
23.98p is the preferred rate to run HD for cinema, with audio running at
48kHz instead of slowing it down by the 1000/1001 factor.

-- 
Michael Poimboeuf
mkp at poimboeuf.com
mkp at digidesign.com

Jack James said:
> Thanks to Digital Pictures Sydney for supporting the TIG.
> --
>
> Ok, this is something that I've been trying to get my head around for a
> long
> time now. With SD video, you have NTSC drop-frame and non-drop. I
> understand
> the reasons and history behind it, that the number of actual frames is
> exactly the same regardless, and that DF drops two frames a minute, 9 out
> of
> every 10 minutes. Good.
>
> But with HD (and I'll ignore progressive formats for the sake of argument)
> you have 59.94i and 60i formats. How does this work in terms of timecode?
> Is
> 59.94i drop frame and 60i non-drop? Or are the two completely independent,
> requiring standards conversion to go from one to the other? Because let's
> face it, it doesn't seem to make sense to talk about a 59.94 (or 29.97)
> non-drop timecode does it?
>
> And. where exactly does 23.98 fit into all of this?
>
> If anyone can explain this to me in terms of the number of actual frames
> of
> each, that would be best.
>







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