media-processing（媒体处理）

Media Processing Skill

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

Tool Selection

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