Video Settings

[biferi]

I have Movie Studio Platinum 15.0 and Win10 DeskTop Computer.

I wanted to know if anybody can help me understand a Setting?

When I go to Setup my Video Settings before I start Importing Video into my Project I go into my Video Project Settings.

I am in the Video Project Drop Down Window and See 2. that are for HD 1080 this is what I do not Understand I hope somebody can help?

One Says HD 1920 X 1080 - 50i 29.97 FPS.
The other one Says HD 1920 X 1080 - 60i 29.97 FPS.

They 29.97 FPS Frame Rate so what is the 50i and 60i Telling me?

[davexnet]

So we can get some context, can you create and upload a screenshot showing this

[biferi]

I was able to Post this in the Magix Forum I am so so sorry.
Thanks for the Time.

[ChapmanDolly]

The 50i and 60i refer to interlaced footage which is mainly used in broadcast. 50i would be for most of Europe, 60i for the Americas and some other countries. It is a hangover from CRT monitor and tv days and refers to the number of odd and even picture fields that make up a 25fps or 30fps broadcast picture. Not really relevant in todays progressive scan world.

[biferi]

Yes I get the USA Frame Rate is 29.97 FPS.

In the Old Days USA CRT TVs would Draw a whole new screen 60 Times Per Second.

So let me See if I get this Right?

CRTs in the USA would show an Image 29.97 Frame Per Second.
Now we Say 30 Frames Per Second.

So as 1. Frame would be Fading away the next Frame would be showing.

So where did the 60i come in?

[davexnet]

Yes I get the USA Frame Rate is 29.97 FPS.

In the Old Days USA CRT TVs would Draw a whole new screen 60 Times Per Second.

So let me See if I get this Right?

CRTs in the USA would show an Image 29.97 Frame Per Second.
Now we Say 30 Frames Per Second.

So as 1. Frame would be Fading away the next Frame would be showing.

So where did the 60i come in?

The CRT's TV's were interlaced, 29.97 frames per second, 59.94 (60i) fields per second

[jagabo]

In the Old Days USA CRT TVs would Draw a whole new screen 60 Times Per Second.

No, it would redraw half the scan lines (every other line, a field) every 1/60 second, taking two passes to cover the entire screen area. By the time one field is being drawn the previous field has completely faded.

[biferi]

Well the CRTs Ran at 60 Hz and this is 60 Cycles Per Second.
And the CRTs had a Frame Rate of 29.97 Frames Per Second.

So the 29.97 Frames Per Second was the Interlaced Total Right?

[jagabo]

Well the CRTs Ran at 60 Hz and this is 60 Cycles Per Second.
And the CRTs had a Frame Rate of 29.97 Frames Per Second.

So the 29.97 Frames Per Second was the Interlaced Total Right?

Yes, when interlaced analog video is digitized and woven into frames you get 29.97 frames per second. But it's important to know that cameras scanned one field at a time and that's what you saw on the screen. You never saw a full frame. And you potentially had 60 motion increments per second. So a an object moving across the screen could appear at 60 different positions every second.

About 2 minutes into this youtube video you can see some high speed videography of a CRT in action:

https://www.youtube.com/watch?v=3BJU2drrtCM

You can see individual scan lines being drawn from left to right across the screen.

[biferi]

So the 29.97 Frames Per Second the CRT would Draw.

So 14.98 would be Half a Field and 14.98 would be the other Half a Field.

But Bot Fields are Interlaced I get this this is how we get 29.97 FPS.

So we would get 29.97 Frames in 1. Second.

So how can they Say 60i this is what I should have Asked?

[DB83]

Everything got 'muddled' with the concept of HD video.


Firstly you accept that analog video is constructed, as has been mentioned here more than once, in alternating fields where each field effectively is 1/60th of a complete picture.


In the analog realm there are no complete frames. Yet even when you capture an interlaced signal to a digital SD video you still have 59.94 fields or 29.97 frames


Now we turn to HD video. Someone thought it 'smart' to refer to the older SD sources of 60 fields as 60i even though it is still, effectively, only 29.97 fps. And to confuse the issue even more you can have 60p which really is 60 fps


But what is really odd from your initial question is the 50i at 29.97 fps. That one I can not get my head around.

[manono]

So how can they Say 60i this is what I should have Asked?

Because you've fallen victim to the 60i nonsense

jagabo already explained this but you're not paying attention.

2 fields make up 1 frame. They're the upper field and the lower field. Woven together, 2 of them make up a single frame. 14.98 has nothing to do with anything.

59.94 (aka 60) fields get drawn every second on a CRT television screen. 60i refers to these 60 fields per second. You weave those field-pairs together and you get 29.97 frames per second. That is sometimes (and more accurately, as far as I'm concerned) called 29.97i (or 30i). In this context, both 29.97i (30i) and 59.94i (60i) are the same thing.

[jagabo]

Firstly you accept that analog video is constructed, as has been mentioned here more than once, in alternating fields where each field effectively is 1/60th of a complete picture.

No, each field is half a picture. Fields are drawn at 59.94 fields per second. A digital frame is composed of two fields so you get 29.97 frames per second when digitized.

But what is really odd from your initial question is the 50i at 29.97 fps. That one I can not get my head around.

I thought that was just a typo. But maybe they're talking about a frame rate conversion.

[chris319]

each field is half a picture

... comprised of alternate scan lines.

Field 1 = lines 1, 3, 5, 7, etc.

Field 2 = lines 2, 4, 6, 8, etc.

Interlacing is part of a current (2021) digital standard for broadcast; it's not confined to analog CRT displays. In the U.S. NBC and CBS have standardized on 1080 interlaced. The other broadcast format is 720 progressive: 59.94 complete progressive frames per second (all scan lines).

1080 progressive is not a broadcast format.

[Selur]

Yeah, old satellite requiring bit stuffing etc. really causes the broadcast standards to be a mess,...