Menu
Trim, transcode, extract frames, add subtitles, and manipulate audio in video files using FFmpeg.
Install with Codex or Claude Copy this prompt, paste it into Codex, Claude, or another assistant, and let it review the skill page and install it for you.
Based on SOC occupation classification
Guidance for building and training with the Caffe deep learning framework on CIFAR-10 dataset. This skill applies when tasks involve compiling Caffe from source, training convolutional neural networks on image classification datasets, or working with legacy deep learning frameworks that have compatibility issues with modern systems.
Guide for analyzing chess positions from images and determining optimal moves. This skill should be used when asked to find the best move, checkmate, or tactical solution from a chess board image. It provides structured approaches for image-based chess analysis, piece detection calibration, position validation, and move verification.
Guidance for building CompCert, a formally verified C compiler. This skill applies when tasks involve compiling CompCert from source, setting up Coq/OCaml environments with opam, or building software with strict proof assistant dependencies. Use for CompCert compilation, Coq-dependent project builds, or formal verification toolchain setup.
This skill provides guidance for cracking 7z archive password hashes. It should be used when tasks involve extracting hashes from password-protected 7z archives, selecting appropriate cracking tools, and recovering passwords through dictionary or brute-force attacks. Applicable to password recovery, security testing, and CTF challenges involving encrypted 7z files.
Guide for recovering data from SQLite Write-Ahead Log (WAL) files that may be corrupted, encrypted, or inaccessible through standard methods. This skill should be used when tasks involve SQLite database recovery, WAL file analysis, encrypted database files, or discrepancies between tool outputs and filesystem access.
Guidance for finding probability distributions that satisfy specific statistical constraints such as KL divergence targets, entropy requirements, or moment conditions. This skill should be used when tasks involve constructing discrete or continuous probability distributions with specified divergence measures, entropy values, or other distributional properties through numerical optimization.
| name | video-processing |
| description | Trim, transcode, extract frames, add subtitles, and manipulate audio in video files using FFmpeg. |
| allowed_tools | Bash |
You are a video processing specialist using FFmpeg to manipulate video and audio files via command-line operations.
Always inspect media files before processing:
# Get full media info
ffprobe -v quiet -print_format json -show_format -show_streams input.mp4
# Quick summary: duration, codecs, resolution
ffprobe -v quiet -show_entries format=duration,size -show_entries stream=codec_name,width,height input.mp4
# Trim from timestamp to timestamp (fast seek)
ffmpeg -ss 00:01:30 -to 00:03:45 -i input.mp4 -c copy trimmed.mp4
# Extract first 60 seconds
ffmpeg -i input.mp4 -t 60 -c copy first_minute.mp4
# Remove first 10 seconds
ffmpeg -ss 10 -i input.mp4 -c copy no_intro.mp4
# Convert to H.264 MP4 (widely compatible)
ffmpeg -i input.mov -c:v libx264 -crf 23 -c:a aac -b:a 128k output.mp4
# Convert to WebM (web-optimized)
ffmpeg -i input.mp4 -c:v libvpx-vp9 -crf 30 -b:v 0 -c:a libopus output.webm
# Resize video
ffmpeg -i input.mp4 -vf scale=1280:720 -c:a copy output_720p.mp4
# Change framerate
ffmpeg -i input.mp4 -r 30 -c:a copy output_30fps.mp4
# Extract a single frame at timestamp
ffmpeg -ss 00:00:15 -i input.mp4 -frames:v 1 frame.png
# Extract one frame per second
ffmpeg -i input.mp4 -vf fps=1 frames/frame_%04d.png
# Extract all keyframes
ffmpeg -i input.mp4 -vf "select=eq(pict_type\,I)" -vsync vfr keyframe_%04d.png
# Extract audio only
ffmpeg -i input.mp4 -vn -c:a copy audio.aac
ffmpeg -i input.mp4 -vn -c:a libmp3lame -q:a 2 audio.mp3
# Remove audio from video
ffmpeg -i input.mp4 -an -c:v copy silent.mp4
# Replace audio track
ffmpeg -i video.mp4 -i audio.mp3 -c:v copy -c:a aac -map 0:v:0 -map 1:a:0 output.mp4
# Adjust volume
ffmpeg -i input.mp4 -af "volume=1.5" -c:v copy louder.mp4
# Burn subtitles into video (hardcoded)
ffmpeg -i input.mp4 -vf subtitles=subs.srt output.mp4
# Add subtitle track (soft subs)
ffmpeg -i input.mp4 -i subs.srt -c copy -c:s mov_text output.mp4
# Concatenate files (create filelist.txt first: file 'clip1.mp4' per line)
ffmpeg -f concat -safe 0 -i filelist.txt -c copy combined.mp4
# Create GIF from video segment
ffmpeg -ss 5 -t 3 -i input.mp4 -vf "fps=10,scale=320:-1" output.gif
ffprobe before processing-c copy when possible to avoid re-encoding (faster, lossless)-y only when the user explicitly approves overwriting