BluRay frame rate

[sundance]

Although I searched for quite a while now, I couldn't find a decent source of information on how those "strange" frame rates like (24 * 1000/1001) = 23,976 fps came off. I mean the source's frame rate (movie) is 24 fps, so why had that to be changed?

[nurbs]

It's done so you can broadcast it on NTSC TVs which use 29.97 Hz.

Wikipedia:
http://en.wikipedia.org/wiki/24p#Conversion_of_24p_to_NTSC-based_frame.2Ffield_rates
http://en.wikipedia.org/wiki/Telecine#2:3_pulldown

[brunersany]

Both 24 and 23.976 fps are supported by the Blu-Ray standard. HD production camera can be set to 23.976, 24 or 25 fps. I know that 24p is for film transfer where 23.976 and 25 for HDTV. And when 24 fps film is displayed on NTSC system, playback is slowed to 23.976 fps. For PAL system 24 fps film is up to 25 fps. I resume that Blu-Ray players do the same for 24 fps but I am not sure.

[ajri02]

Although I searched for qui (http://sieuthi77.com/giavang)te a whi (http://sieuthi77.com/sangiaodichvang)le now, I couldn't fi (http://sieuthi77.com/vang)nd a decent source of informati (http://sieuthi77.com/xaydungthuonghieu)on on how those "strange" frame rates li (http://sieuthi77.com/temchonghanggia)ke (24 * 1000/1001) = 23,976 fps came off. I mean the source's frame rate (movi (http://luoinhua.com/content/luoinhua.html)e) is 24 fps, so why had that to be changed?

I think 1080 at 24 fps will be fine. The ignorant will be unaffected and when sets that can do 1080p @ 60fps come around there will be players that turn 1080i 30 into 1080p 60.

[yesgrey]

I mean the source's frame rate (movie) is 24 fps, so why had that to be changed?
I don't remember the thread's name, but I believe it was in avsforum, that I've read that keeping the 24/1.001 fps frame rate is due to all current equipments and software still expecting it and only work reliably with it.
Due to NTSC, the movies were always slowed down a little, so all the equipment were built around that concept. So, because there are too many equipments still in use, it would be a major problem changing all to 24.0, so they decided to just keep it.

If I can find the thread I will point it to you.

[invisible]

So HDTVs can't do exact 24 fps? I thought we'd be rid of the annoying NTSC/PAL difference with a new age. Guess not.

[reepa]

I thought we'd be rid of the annoying NTSC/PAL difference with a new age.
With Blu-Ray there's no difference - movies are 24/1.001 Hz. The playback device decides what to do with it (e.g. convert to 50 Hz, 60 Hz, or keep at 24 Hz).

I wouldn't be surprised if most displays that support 24/1.001 Hz synced to exactly 24 Hz.

[Lyris]

Actually, there are a few BD titles that are 24fps. Most are 23.976.

[mariner]

Just picked up my third 24.000fps BD, The Edge of Love. What a mess.