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Comment by dylan604 | Hacker News Reader

Rarely do I shoot things at "normal" frame rates. I find things much more interesting at different frame rates. Shooting 60fps for 24fps playback is just slow enough to give it the look discussed without going extreme high frame rates. I don't have anything that shoots higher than 120fps, but going into those extremely high rates is just surreal.

Going the opposite direction, I love time lapse as well. Seeing things that seem perceptually static move in playback can reveal a lot of interesting things that happen at rates too slow for our hectic hustle and bustle life styles to appreciate.

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The YouTuber Tom Scott did a video shot in the style of a music video that was really interesting, and one of the things that surprised me was how little of the video was shot using the "right" frame right - for example, they shot dancers at a slightly slower frame rate then speed the footage up to make them look more in sync, or slowed other shots down to make them feel more dreamy. But only fairly subtly, so that you don't necessarily notice it if you're not looking for it.

There's definitely something fascinating about playing with playback speeds.

Some one in a commentary track for some movie (I know really specific here, but the brain is fuzzy on the details) used a phrase that has always stuck with me when talking about their use of off speed frame rates. They used the term "imperceptible slow motion". It's not slo-mo for slo-mo sake, but just enough to give it that slight not normal feel.

The director of the Shield would switch from normal 24fps to 30fps in camera to playback at 30fps. So it wasn't slow motion, but the switch in frame rate gave it just enough of a difference to get the viewer to feel it. So there's a lot of things that can be done that are perceptible subconsciously without making it a slap in the face type of effect.

Wouldn't it be the opposite to get slow mo? shoot in 30 but playback at 24?

Wow, fascinating! I was wondering what they did with voice pitch and turns out they recorded at normal speed and then lip sync at a different speed to match the camera speed.

https://m.youtube.com/watch?v=G025oxyWv0E

Seeing something in slow motion is seeing something more clearly. You have time to observe it better, to understand it better. You feel like you get something more out of it, and thus it is more valuable to you and to the advertisers.

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