agentmods.dev

ck:media-processing

A guide to processing video, audio, and images with command-line tools. It covers conversion, resizing, effects, thumbnails, background removal, and streaming formats.

In plain words
What is it for?
Use it to convert or encode video and audio, extract sound, resize or edit images, remove image backgrounds, create thumbnails or GIFs, and prepare HLS or DASH streams.
Why use it?
It provides one workflow for common media tasks instead of requiring separate manual tools for each file or format.

Skill for Claude CodeCodex

88 3d ago B scan 47 tokens original MIT
View the source file manhvann/codexkit
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/manhvann/codexkit/media-processing
Any agent
npx skills add manhvann/codexkit --skill media-processing
Clone the repo
git clone --depth 1 https://github.com/manhvann/codexkit

Made for: Claude Code, Codex.

Per session 47 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 792 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00047 $0.00792
Opus 5 $0.00023 $0.00396
Sonnet 5 $0.00009 $0.00158
Haiku 4.5 $0.00005 $0.00079

Measured 2d ago against content hash 14dabd3e1c8f, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade B, and why

ck:media-processing scanned grade B with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

The scan reads SKILL.md. This mod also ships 9 executable files (scripts/batch_resize.py, scripts/batch-remove-background.sh, scripts/media_convert.py, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Asks for rootmediumPrivilege escalation

A mod that escalates privileges can change anything on the machine, not only the project.

sudo apt-get install ffmpeg imagemagick
.agents/skills/media-processing/SKILL.md · 93 lines

How it starts

The opening of the file, as written. The whole thing — 93 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Media Processing Skill

Process video, audio, and images using FFmpeg, ImageMagick, and RMBG CLI tools.

Tool Selection

Task Tool Reason
Video encoding/conversion FFmpeg Native codec support, streaming
Audio extraction/conversion FFmpeg Direct stream manipulation
Image resize/effects ImageMagick Optimized for still images
Background removal RMBG AI-powered, local processing
Batch images ImageMagick mogrify for in-place edits
Video thumbnails FFmpeg Frame extraction built-in
GIF creation FFmpeg/ImageMagick FFmpeg for video, ImageMagick for images

Installation

# macOS
brew install ffmpeg imagemagick
npm install -g rmbg-cli

# Ubuntu/Debian
sudo apt-get install ffmpeg imagemagick
npm install -g rmbg-cli

# Verify
ffmpeg -version && magick -version && rmbg --version

Essential Commands

# Video: Convert/re-encode
ffmpeg -i input.mkv -c copy output.mp4
ffmpeg -i input.avi -c:v libx264 -crf 22 -c:a aac output.mp4

# Video: Extract audio
ffmpeg -i video.mp4 -vn -c:a copy audio.m4a

# Image: Convert/resize
magick input.png output.jpg
magick input.jpg -resize 800x600 output.jpg

# Image: Batch resize
mogrify -resize 800x -quality 85 *.jpg

# Background removal
rmbg input.jpg                          # Basic (modnet)
rmbg input.jpg -m briaai -o output.png  # High quality
rmbg input.jpg -m u2netp -o output.png  # Fast

Key Parameters

FFmpeg:

  • -c:v libx264 - H.264 codec
  • -crf 22 - Quality (0-51, lower=better)
  • -preset slow - Speed/compression balance
  • -c:a aac - Audio codec

ImageMagick:

  • 800x600 - Fit within (maintains aspect)
  • 800x600^ - Fill (may crop)
  • -quality 85 - JPEG quality
  • -strip - Remove metadata

RMBG:

  • -m briaai - High quality model
  • -m u2netp - Fast model
  • -r 4096 - Max resolution

References

Detailed guides in references/:

  • ffmpeg-encoding.md - Codecs, quality, hardware acceleration
  • ffmpeg-streaming.md - HLS/DASH, live streaming
  • ffmpeg-filters.md - Filters, complex filtergraphs
  • imagemagick-editing.md - Effects, transformations
  • imagemagick-batch.md - Batch processing, parallel ops
  • rmbg-background-removal.md - AI models, CLI usage
  • common-workflows.md - Video optimization, responsive images, GIF creation
  • troubleshooting.md - Error fixes, performance tips
  • format-compatibility.md - Format support, codec recommendations

Read the full file on GitHub · 93 lines

Files

What ships with it

21 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 93 lines · 47 tokens per session scan B 14dabd3e1c8f

Subscribe to this mod's changes

ck:media-processing is a skill published in the GitHub repository manhvann/codexkit (88 stars, last pushed 3d ago), licensed MIT. It adds 47 tokens to every session and 792 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it B with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Creative and media
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