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

Changing frame count by dropping or duplicating frames requires re-encoding video, which the fps= filter does predictably inside the filter graph. Applying -r as an input option changes how timestamps are read (altering playback speed and duration if streams are copied), while -r on output forces frame dropping or duplication during encoding. For consistent results and unchanged video duration, the fps= filter with -c:v libx264 is the standard approach.

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

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 conversion method: re-encode with libx264 and custom CRF, or filter with FFmpeg default encoding.
Optionally enter your input and output filenames.
The tool generates the exact FFmpeg command with the fps= video filter and audio stream copy.
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: 2026-09-22 · Reviewed by Nham Vu