Posted by Kadaitcha Man on 10/11/05 05:20

George Hammond, <ghammond1@earthlink.net>, the bacterial, odoriferous
miscreant, and dog-whipper, cackled:


> [Hammond]
> Yeah... that's because any computer monitor can be used as
> a "t.v." if it has the appropriate software for generating
> a t.v. signal. So what.... there's no way to "edit" a DVD
> and make an invisble move out of it.
>
> Like I say, you'd have to use videotape.... edit it on
> a computer.... and then play it on a VCR.

So, is that a Phase Alternating Line playback VCR, which plays back at 25
frames per second, or is it an NTSC VCR, which plays back at 29.97fps
frames per second unless it's recorded on NTSC film, which records at
23.976fps, George?

> Now video films are shot at 30 frames per second,

PAL = 25fps. NTSC = 29.97fps. NTSC Film = 23.976fps.

> OK, this is one second of a conventional 30 frames/sec video tape.

PAL = 25fps. NTSC = 29.97fps. NTSC Film = 23.976fps.

> OK, |NN| represents one frame of an actual movie video shot at
> 30 frames per second. And |...| represents one frame of
> a blank gray background also shot a 30 fps. (we're using
> black & white here to keep it simple).

PAL = 25fps. NTSC = 29.97fps. NTSC Film = 23.976fps.

> Note that every 3rd,4th,5th and 6th frames of the original
> movie have been deleted and replaced with blank frames,
> in succession after 2 real frames have been used.

PAL = 25fps. NTSC = 29.97fps. NTSC Film = 23.976fps.

> This gives us a sequence of 1/15 second of real movie
> alternated with 1/7.5 second of blank screen.

PAL = 25fps. NTSC = 29.97fps. NTSC Film = 23.976fps.

> Since it takes the kid 1/8 of a second to see the
> real photos but they are only flashed for 1/15 of a
> second.... he will see nothing but a light grey screen
> with nothing on it.

PAL = 25fps. NTSC = 29.97fps. NTSC Film = 23.976fps.

> The adult however CAN see a picture that is only
> flashed for 1/15 of a second... so he will see the
> real movie.

PAL = 25fps. NTSC = 29.97fps. NTSC Film = 23.976fps.

Back to the drawing board, George.

"Movies on film are shot at a frame rate of 24 fps (frames per second) while
NTSC video has a frame rate of 30 fps (actually 29.97) and PAL/SECAM video
has a frame rate of 25 fps.

These frame rates are too low for a flicker free result when viewing on a TV
screen or movie screen."

http://www.disctronics.co.uk/technology/video/video_film.htm

--
Pierre Salinger Memorial HL&S, September 2005.

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