What is 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.

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.

It provides one workflow for common media tasks instead of requiring separate manual tools for each file or format.

ck:media-processing — Skill for Claude Code by 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.

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.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/manhvann/codexkit/media-processing/github.svg)](https://agentmods.dev/skills/manhvann/codexkit/media-processing)

Your own site

<a href="https://agentmods.dev/skills/manhvann/codexkit/media-processing"><img src="https://agentmods.dev/badge/skills/manhvann/codexkit/media-processing/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/manhvann/codexkit/media-processing"><img src="https://agentmods.dev/badge/skills/manhvann/codexkit/media-processing.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

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. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector warn 7 Sept 2026

SkillSpector: 1 finding, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

medium Privilege Escalation · line 32
Commands invoke sudo or root privileges. Verify this elevated access is necessary and justified.

Fix: Avoid sudo/root unless strictly required. Prefer least-privilege patterns. If elevation is needed, document the justification and scope.

How audits are shown

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.

Model	Per session	Once invoked
Fable 5.1	$0.00047	$0.00792
Opus 5.5	$0.00019	$0.00317
Sonnet 5.5	$0.00009	$0.00158
Haiku 4.5	$0.00005	$0.00079

Measured 1mo ago against content hash 14dabd3e1c8f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, 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 1mo 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.

1mo 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 (89 stars, last pushed 1mo ago), licensed MIT. It adds 47 tokens to every session and 792 once invoked, about $0.0002 per session on Opus 5.5. 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.

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ck:media-processing