A Quick Question about Slow Motion and Double NTSC

Gary-Parnell wrote on 9/19/2022, 1:08 PM

I'm using Vegas Pro 19 (build 643) (Windows 10).

I have a 1080p video that was recorded in 59.940 (double NTSC). I want to slow parts down to about 50% speed. My question is: does having the doubled framerate help at all in giving a smoother velocity stretch? Would setting the project/render settings make a difference? As in, matching the 59.940 - or changing to 29.970 - before doing my stretching and ulimate rendering. It may seem like a no-brainer, but I'm an audio tech moreso than a video.

I am aware of the default Slow Motion FX, the "stretch and pull" method, as well as the video velocity envelop method. I'm also aware of the various affects they have on audio, meaning I'm not entirely a new guy haha. Mostly I am curious about framerates and how to best achieve the most fluid and smooth slo-mo with a 59.940 source video. (I'm not concerned at all about the audio - that can easily be worked around.)

Thanks!

Comments

john_dennis wrote on 9/19/2022, 1:28 PM

@Gary-Parnell

At what frame rate do you plan to deliver your masterpiece? 29.976 or 59.940?

Gary-Parnell wrote on 9/19/2022, 3:51 PM

@Gary-Parnell

At what frame rate do you plan to deliver your masterpiece? 29.976 or 59.940?

That was sort of the question, yes? At what framerate should I deliver my masterpiece?

Vdanny wrote on 9/19/2022, 4:24 PM

@Gary-Parnell

Hi,

You should record scenes you don't want in slow motion at 23.976 or 29.97. Only record scenes for slow mo in double NTSC and then render out in the framerate of the regular motion footage. If you have already recorded everything in 59.94 you should render in that but it should still give you better "stretch and pull" results. You can try rendering at a lower framerate with this video but regular speed clips may have odd motion.

Former user wrote on 9/19/2022, 5:16 PM

if you set project timeline of 23.976, you have 2 smooth slow motions, 40% speed playback and 80%, 40% would be most suitable for your cause, but 80% is also good for the dream like subtle slowmotion, popular with wedding photographers. 29.976 timeline you only have 50% playback as an option. You could use optical flow to help smooth out ramping, or other slow motion frame rates, but doesn't work so good on Vegas

It depends on what you're filming, the lower your project frame rate the more you need to worry about pan speed and camera movement not looking smooth. The following gives you a guide for what your pan speed should be for a given frame rate and focal length

https://www.red.com/panning-speed

john_dennis wrote on 9/19/2022, 6:43 PM

@Gary-Parnell

I would likely deliver at 29.97p.

Considerations

1. Shutter speed you used to shoot the original media.

2. Subject matter.

3. How much motion blur you think you should have.

I’ve kept this screenshot on my iPad for many years.

Musicvid wrote on 9/19/2022, 8:52 PM

I would likely deliver at 29.97p.

Yep