I'm not going to jump in. It's way to convoluted for my 68 years old farting brain but please... RTFM and lets move on.
Marcel ;-)
On 04/08/2020 13:07, hoplist wrote:
Film projection is 24/48. Is digital cinema projection 24.0fps at 48.0khz? I would presume that it is, but I'm curious.
Greg, what is your true 24.0 source? An NLE I presume?
That reminds me of one problem with 29.97p. Blu-ray can't do 30p. It can do 24p and 59.94i, but not 30p. If your source is 30p, you have to encode as 59.94i. In theory, there should be no visual difference. In practice, there is because of deinterlace circuitry. Sad.
A question for the feature Blu-ray authors out there. Do you master at 24.0 or 23.98? From what I've read (quickly), Blu-rays are predominantly mastered at 23.98 due to the same legacy hardware issues, but maybe that's changing?
Cheers,tod
On Aug 4, 2020, at 11:06 AM, Secret HQ <Greg@secrethq.com> wrote:
Just to add useless info that most of you already know, traditional theatrical projection is actually 48fps- the projector showing each of the 24 frames twice. That's why they make a flicking/ grinding sound, because the film is not moving smoothly through the gate- but stopping for 2/48ths of a second, then getting yanked out of the way. The projector's shutter is actually more like a spinning butterfly.
My Sony OLED does show true 24 (or 2398 if that's the input) and people who are not acclimated often say 'why is the monitor flickering?' When they walk in the room.
As to needing to get some camera folks into this discussion... why? They don't care what post thinks! ;-)
GH
On Aug 4, 2020, at 07:47, Paul Darrigo <fedguy2@pacbell.net> wrote:
Good points.
We need camera operators in here to comment
Paul Darrigo
CHULA - Citizens for a Humane Los Angeles
https://www.facebook.com/groups/773416409436730/
323-244-8020
On Tuesday, August 4, 2020, 7:41:01 AM PDT, hoplist <hoplist@hillmanncarr.com> wrote:
This is getting fun, and deep. Time for the engineers, which I am not, so feel free to elaborate and correct. I'm totally open to learning. Yes, ATSC technically allows all those rates. In pure digital video you can have any frame rate you like, even variable frame rates. Gamers talk about their "frame rates" all the time.
Can anyone name an outlet that specifies 24.0 other than cinema?
Does anyone know of any outlet that specifies 30.0 rather than 29.97?
Analog video devices have a sync rate specified in hertz. Modern monitors can sync to a wide range of frequencies, but this ability exists because of computers, not television. "Televisions" run at 59.94hz (in America), because that's what they've always done. I'm currently setting aside the bullshit "120hz" phenom because I don't honestly know what the frequency actually is there. The reason 23.976fps and 29.97fps exist is to synchronize with this standard frequency. Hence, my reference to 23.976 and 29.97 as frequencies, but I stand corrected. Frame rate and frequency are, indeed, not the same thing. Most monitors cannot even run at 23.976hz. It's too slow. They run at a multiple of 23.976 when displaying a 24fps signal (Blu-ray and DVD), or they add pull-down and run at 59.94hz.
In theory, ATSC allows other frame rates, but does anyone actually use them for delivery?
Cheers,tod
On Aug 3, 2020, at 10:02 PM, Mark Spano <cutandcover@gmail.com> wrote:
Please don't spread this. It's false. It might have been true at some point long before the HD days, but I guarantee you can have all of the following frame rates in video without blinking.
23.97624.025.029.9730.059.9460.0
And many more!
No comments:
Post a Comment