What is the difference between -r and the fps filter?

The -r flag sets the container frame rate and can cause FFmpeg to duplicate or drop frames without re-encoding. The fps= video filter explicitly duplicates or drops frames inside the filter graph, which is more predictable for re-encodes. For a full quality re-encode, the fps= filter combined with -c:v libx264 gives the cleanest result.

Will changing frame rate affect video duration?

No. FFmpeg adjusts the presentation timestamps so the total duration stays the same. Frames are either duplicated (when increasing FPS) or dropped (when decreasing FPS) to fill the same time span.

What is 29.97 fps and why does it exist?

29.97 fps (technically 30000/1001) is the NTSC color television standard from the 1950s. It exists due to a compatibility hack when color TV was introduced. Many cameras record at 29.97 rather than a clean 30 fps. FFmpeg accepts it as the fraction 30000/1001.

Can I convert from 24 fps to 60 fps without judder?

Simple 24→60 conversion causes judder because 60 is not an exact multiple of 24. FFmpeg will unevenly duplicate frames. For smooth results, use motion interpolation software such as SVP or DaVinci Resolve — plain FFmpeg frame duplication cannot create new in-between frames.

What CRF value should I use?

CRF 18 is near-lossless and the recommended default. CRF 23 is FFmpeg's default and gives good quality at smaller size. CRF 28 is acceptable for web streaming previews. Lower values = better quality, larger file.

Video Frame Rate Changer

Name: Video Frame Rate Changer
Availability: InStock
Author: Nham Vu

Enter your source and target frame rates to get the exact FFmpeg command that converts video FPS — copy and run it in your terminal.

Frame Rate Settings

Source FPS

Custom: fps

Target FPS

Custom: fps

Conversion Method

Re-encode: full quality transcode, reliable frame duplication/drop.

Input file

Output file

Video Quality (CRF)

Lower = better quality, larger file. 18 = near-lossless. 23 = default. 28 = web.

From — fps

To — fps

Ratio —

Generated FFmpeg Command

Flag Breakdown

Common Frame Rate Reference

FPS	Exact fraction	Standard	Typical use
23.976	24000/1001	NTSC film	Blu-ray, streaming
24	24/1	Cinema	Film, DCP delivery
25	25/1	PAL / SECAM	European broadcast
29.97	30000/1001	NTSC color	US broadcast, cameras
30	30/1	Web video	YouTube, social media
60	60/1	High frame rate	Gaming, sports, HFR
120	120/1	Slow-motion	Action cams, phones

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Summary

Enter your source and target frame rates to get the exact FFmpeg command that converts video FPS — copy and run it in your terminal.

How it works

Enter the source FPS of your video (or pick a common preset).
Enter the target FPS you want the output to have.
Choose a re-encode method: re-encode with libx264, or fast filter-only fps retimestamp.
Optionally enter your input and output filenames.
The tool generates the correct FFmpeg command with -r or fps= filter flags.
Click "Copy Command" and paste it directly into your terminal.

Use cases

Convert a 60 fps gaming capture to 30 fps for social media upload limits.
Retimestamp a 29.97 fps broadcast clip to clean 30 fps for editing.
Convert 24 fps cinematic footage to 25 fps for PAL broadcast delivery.
Reduce a 120 fps slow-motion clip to 24 fps for final export.
Normalize mixed-FPS assets to a common timeline FPS before merging.
Create a low-FPS stylized look from high-FPS source footage.

Frequently Asked Questions

Last updated: 2026-06-11 · Reviewed by Nham Vu