Individual skill

evo-video-keyframe-extraction

Extracts keyframes from an MP4 video at uniform temporal intervals using OpenCV VideoCapture, saves them with sequential naming (keyframes_001.png, keyframes_002.png, etc.), and converts them in-place from BGR to grayscale.

tasks-evolved/mario-coin-counting/environment/skills/evo-video-keyframe-extraction/SKILL.md

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Last checked: Nov 6, 2026

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Repository stars (not skill ratings): 97
Repository last updated: Sep 10, 2026
License: Apache-2.0

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open-world Repository topic
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# evo-video-keyframe-extraction

## Overview
Extracts keyframes from gameplay video using uniform temporal sampling, saves with zero-padded sequential naming, and converts to grayscale in-place.

## Key Concepts
- Uses `cv2.VideoCapture` for video decoding with embedded FFmpeg backend
- Uniform temporal sampling: extract 1 frame per second (frame_interval = int(fps * 1.0))
- Frames saved as PNG with `cv2.imwrite()` using zero-padded naming: `keyframes_001.png`, `keyframes_002.png`, etc.
- Grayscale conversion done in-place: read with `cv2.IMREAD_GRAYSCALE`, overwrite original file
- OpenCV uses BGR channel order (not RGB)
- For a 27-second 60fps video, extracts 27 keyframes (one per second)

## Functions