Frame Rate When Ripping DVDs?

[Jerry Wise]

about 29.97 frame rate, i would Google “drop frame timecode vs non drop frame” and that will explain things better.

[Bobby Hall]

Thanks Jerry and Dave!

So if I rip a 24 fps movie DVD, I should rip it at 23.976 to have the frame rate that’s stored on the DVD? If I rip it at 24 fps, will it slightly speed up the movie to make it the exact same length as the original film? And is there any downside to doing this? Would that technically alter the audio pitch at all?

Also, in case I want to use the footage in a 29.97 fps timeline in FCP, would I rip the 24 fps DVD footage at 29.97? Or would that just create duplicate frames?

[Nick Meyers]

i’d always rip with the original frame rate.
deal with it later if you need to, when it is in a better format, like Prores.

changing the frame rate while ripping would most likely just drop or add frames.

“Also, in case I want to use the footage in a 29.97 fps timeline in FCP, would I rip the 24 fps DVD footage at 29.97? Or would that just create duplicate frames?”

yes. that’s FCP’s way.
not very good.

i’ve never had to deal with this situation, living in PAL land,
but if i had to, i’d look to Compressor.

nick

[Bobby Hall]

Thanks Nick. When you say rip it at its original frame rate, do you mean the 23.976 rate or the original 24 film rate?

[Bobby Hall]

Thanks for your help everyone!

[Bobby Hall]

Just a couple other questions. If the NTSC decided to lower the bandwidth to allow for color video, why didn’t they decrease the bandwidth used for audio so that video could still be at 30fps?

And when slowing down film from 24fps to 23.976 and video from 30fps to 29.97, does that change the pitch of the audio at all, or is the pitch the same and just the length different?

[Nick Meyers]

“why didn’t they decrease the bandwidth used for audio so that video could still be at 30fps?”

dunno!

“does that change the pitch of the audio at al”

yes, but not by much.
I think that for many years this was simply tolerated,
but now with better tools, it may be dealt with.

why not check for yourself?
Conform a clip with audio you are familiar with (including music) thru CinemaTools.
have a listen.

but why I’m back is i just read this about Resolve 12.5:

“23.98 and 24fps material can be rendered to 29.97 and 30fps: It seems like most projects deliver in 23.98, but just this month I had a job that required delivery to 29.97. Having this render option available saves a conform step and is indispensable when delivering directly from Resolve.”

nick

[Bobby Hall]

Thanks Nick. If I rip a DVD using mpeg streamclip and the movie is 23.976, does that mean it’s progressive? Or is it really interlaced and I should check “deinterlace video” if I’m working in a progressive timeline?

And when would someone use “interlaced scaling”?

[Bobby Hall]

Also, I’ve been reading different articles about this subject and now I’m not so sure what’s going on. I looked at the frame rates of several of my my movie DVDs (originally 24fps movies) in MPEG Streamclip and it said all of them were 23.976 fps. But I also read some articles that said movies put on DVD aren’t actually 23.976 fps but are really interlaced into separate fields. And that all NTSC DVDs are 480i and are displayed at 29.97 fps.

Now, when MPEG Streamclip is telling me the movies are 23.976, does this mean it’s just telling me the frame of the video file before it was actually put on the DVD? Is it really 29.97fps (or 59.94 fields per second) and the 23.976 is just info about the video before put on a DVD? Or is the actual movie file 23.976 on the DVD and the DVD has flags that tell a DVD player to split the film into fields, which would be 47.952 fields per second (23.976 x 2), and then it also has flags to tell the player to do 2-3 pulldown?

I’m not sure, but I think what’s happening is that during the telecine process, the 24fps movie is slowed down to 23.976fps, and then it’s split up into fields, achieving 47.952 fields per second, and this video file is what’s put on the DVD. And the DVD has flags telling the player to do 2:3 pulldown. So this would mean non-progressive DVD players are 60hz, right?

When I play a DVD on my Blu-ray player, it says 1080/60p, 48 khz. So, this tells me that the player is upscaling the 480i content to 1080, using 2-3 pulldown to convert the 23.976fps to 29.97 fps (59.94 interlaced fields), and then combining each of those fields into single frames, and having each one on the screen twice so that it’s now 60 fps. But then the 48hz thing throws me off. I thought 48hz means it’s just refreshing the screen 48 times per second, twice the rate of 24 fps. When I click through a movie frame by frame, it takes 24 clicks to go one second. So why does it say 60p if each second is actually 24 frames? Is it doing pulldown, and then reversing it or something? What does it mean if my player is 60hz and the Blu-ray player is 48hz?

[Nick Meyers]

Standard def TV was always interlaced.
the fields were not counted back then, just the frames.

the file on the DVD is 23.976 (why waste data-rate with duplicated fields?)
it displays on a TV as 29.97 ( i belevie the player does this)

(( im no expert as i live in PAL land, as I’ve mentioned. i would imagine – or hope- that modern TVs don’t need to have redundant fields added to bulk the frame rate up to 29.947, achieving nothing but a weird motion in the process. i would hope that a modern monitor could display 23.976, but what do i know? ))

the 48Khz you see is referring to the Audio.

nick