THE FEUTEX TOOLKIT

Stream Keyframe and Segment Plan

Plan integer frame counts for keyframes and segment boundaries.

Video workspace● Runs in your browser

01 Your input

Frame ratefpsKeyframe intervalsTarget segment lengths

02 Your result

View or copy raw result data

Result data

Formula

Frames per keyframe interval = round(fps*key); Whole keyframe groups per segment = max(1,ceil(segment/key)); Aligned segment duration = max(1,ceil(segment/key))*round(fps*key)/fps

Sources and model references

https://ffmpeg.org/ffmpeg-filters.html

Worked example

Inputs

Frame rate: 30 fps
Keyframe interval: 2 s
Target segment length: 6 s

Expected results

Frames per keyframe interval: 60 frames
Whole keyframe groups per segment: 3
Aligned segment duration: 6 s

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

Plan integer frame counts for keyframes and segment boundaries.
Set frame rate, keyframe interval, target segment length in the indicated units.
Calculate and compare frames per keyframe interval, whole keyframe groups per segment, aligned segment duration.

Try this example

{
  "fps": 30,
  "key": 2,
  "segment": 6
}

Accuracy and scope

Idealized educational model. Enter measured values in the displayed units; real systems may require additional corrections.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.