NTSC broadcasting habits...

[Herve]

Hello, I live in Europe, so I do not well know broadcasting habits in NTSC.

I readed this technical sheet from Apple, about ProRes
…seems that classical NTSC FILM framerate (24.000 / 1.001) does not exist in HD broadcasting (24p only). Almost the same ...but not exactly

So, if you could help me :
- how is broadcasted your american HD streams? 24p? 60i? 30p?
- the (24.000/1.001)fps still exists with HD streams?
- HD 60i means: 30fps or (30.000/1.001)fps?

thanks (I cannot check by myself, I don't have access to any in Europe, PAL standard )
bye

[jagabo]

That apple white paper uses 24p to mean both 24p and 23.976p. It's the same for 30p and 60p. HD broadcast HD in the USA is still 29.97i fps or 59.94p fps.

[Herve]

so no HD stream in real 30p ?

and no HD streams in 24p/23,98fps?
weird ! … all u.s. series (broadcasted in France) are shooted at 24fps (it's visible )

bye and thanks

[jman98]

so no HD stream in real 30p ?

No.

and no HD streams in 24p/23,98fps?

No.

weird ! … all u.s. series (broadcasted in France) are shooted at 24fps (it's visible )

bye and thanks

Yes, I'm sure that's true. I think the reason is that when ATSC was proposed (this is the name of the digital TV system now in use in the USA instead of NTSC) that it was thought that the technology would not be available to support 24p broadcasts. The people who wrote the standard guessed wrong about that, but it is too late to change the standard now.

[Herve]

thanks, so now I have a "stupider" question:
Do you know what is the interest of HD camcorders shooting at 24p in your country? (for theaters, bluray and home purpose only?)

bye

[jagabo]

Again 24p is shorthand for 23.976p. 24p mode is for people that want the jerky film look. It also allows for longer exposure times and hence, less noise and more motion blur.

Many TVs support 24p with 48, 72, 96, 120, or 240 Hz refresh rates. That allows them to avoid the 3:2 judder of displaying at 60 Hz.

[Herve]

Again 24p is shorthand for 23.976p. 24p mode is for people that want the jerky film look.

Yes, I knew this. And I like "movie look" too (mainly it's "aperture functions"), …but I chose for myself, an HD camcorder that shot at 50i (=PAL interlaced)

I find unbelievable that 24p/23.98 is the prefered mode for shooting series or movies, and not the prefered mode for broadcasting (even some BluRay -sold in Europe- are at 24p/fps!!!)
Europe is simplier, PAL has only one framerate: you shoot at 25p or 50i, so always at 25fps (…and to convert movies from theaters? you just have to accelerate your 24p to obtains a nice 25p )

I will never understand chosen norms
bye thanks for all the infos

[poisondeathray]

I find unbelievable that 24p/23.98 is the prefered mode for shooting series or movies, and not the prefered mode for broadcasting (even some BluRay -sold in Europe- are at 24p/fps!!!)

That's because 25p isn't legal for blu-ray .

Some blu-ray can be made "fake 25p" which is a 25p video in 50i stream , but the official specs don't support native 25pN (only 24/1 and 24000/1001)