帧率 · 时间分辨率Frame rate · Temporal resolution

难度LEVELL1 · 入门L1 · Beginner 领域TOPIC媒体管理

学习目标LEARNING OBJECTIVES

学完你能说清帧率是「时间上的采样密度」，以及为什么慢动作素材必须用高帧率拍。

概念说明CONCEPTS

一秒记录多少帧画面：连续的运动被切成一张张静帧，帧与帧之间的运动由眼睛（和运动模糊）补上。

轴上的数值：

  • 24——电影最熟悉的节奏：轻微运动模糊，有「电影感」
  • 25 / 30——电视与网络常规：新闻、访谈、大部分网络内容
  • 50 / 60——顺滑：体育、游戏、快运动不容易抖
  • 120——慢动作余量：后期放慢 4–5 倍仍然顺

同一素材慢放 4 倍：左边 24fps 采样（台阶 + 拖影），右边 60fps 原样连续。

五个方向合起来看：▶ 五维图交互演示（按 1/2/3/4 切换四种素材）。

操作步骤STEPS

  1. 拍可能要慢动作的画面之前，先把帧率定到 60 或 120
  2. 记住：源帧率必须高于目标帧率
  3. 放慢 4–5 倍以上的镜头，优先用高帧率素材

练习PRACTICE

动手任务

把 fps-60 素材放慢 4 倍导出，和一段 24fps 素材的慢放对比，看台阶感。

自检清单

做完任务后逐条自查，全部能打勾才算过。 做完任务后逐条自查，全部能打勾才算过。

常见问题FAQ

帧率越高画质越好吗？

它买的是运动的顺滑度（时间分辨率），不是像素清晰度；而且高帧率吃光、吃存储。

24fps 的素材能变成 60fps 吗？

不能——源帧率必须高于目标帧率。

Learning Objectives学习目标

After this card you can say what frame rate is — the sampling density of time — and why slow-motion footage must be shot at a high frame rate.

Concepts概念说明

How many frames per second get recorded: continuous motion cut into still instants; your eye (and motion blur) fills in between.

Values on this axis:

  • 24 — the rhythm cinema knows best: slight motion blur, the "film look"
  • 25 / 30 — TV and web standard: news, interviews, most online content
  • 50 / 60 — smooth: sports, games, fast movement holds up
  • 120 — slow-motion headroom: slowed 4–5× it still runs smooth

Same footage slowed 4×: left sampled at 24 (steps + trails), right 60 as-is and continuous.

All five axes together: ▶ the five-axis interactive chart (press 1/2/3/4).

Steps操作步骤

  1. Before shooting anything you might slow down, set the frame rate to 60 or 120
  2. Remember: the source frame rate must exceed the target
  3. For 4–5× slows, prefer high-frame-rate footage

Practice练习

Hands-on task

Export fps-60 footage slowed 4× and compare it with a slowed 24fps clip — look for the staircase.

Self-check

Work through the task, then tick every line; all checked means you own this card. Work through the task, then tick every line; all checked means you own this card.

FAQ常见问题

Is a higher frame rate better quality?

It buys smoothness of motion (temporal resolution), not pixel sharpness — and it eats light and storage.

Can 24fps footage become 60fps?

No — the source frame rate must exceed the target.

本卡术语Terms in this card

导出Export 帧率Frame Rate 分辨率Resolution 静帧Still 模糊Blur 帧Frame 像素Pixel 采样Sampling