What is the 'Golden Rule' of FFmpeg syntax?

FFmpeg options apply only to the next file specified and are reset between files. The correct order is: [global_options] {[input_options] -i input} {[output_options] output}.

Why does my FFmpeg -ss seek take so long?

You are likely placing -ss after the -i flag as an output option, which forces FFmpeg to decode all frames until the seek point. Placing -ss before -i enables fast, input-level seeking using keyframes.

What are global options in FFmpeg?

Global options affect the entire process rather than specific files. Examples include -y (overwrite), -loglevel (verbosity), and -stats (progress reporting), and they must appear at the very beginning of the command.

How do I target only the second audio stream in a file?

Use a stream specifier such as -c:a:1. The ':a' targets all audio streams, and the ':1' targets the second stream in the sequence (as they are zero-indexed).

FFmpeg Command Syntax Master

Name: FFmpeg Command Syntax Master
Author: JosiahSiegel

byJosiahSiegel

•

Herramientas para Desarrolladores

Master complex FFmpeg command-line syntax with precise guidance on option ordering, stream specifiers, and position-sensitive parameters.

This skill provides an exhaustive reference for FFmpeg command construction, specifically focusing on the 'Golden Rule' of option placement where options apply to the next file specified and reset between files. It helps developers avoid common pitfalls, such as placing input options after the -i flag or misconfiguring stream specifiers. Whether you are managing multiple inputs, ensuring frame-accurate seeking, or configuring hardware acceleration, this skill provides the architectural rules needed to generate syntactically correct and efficient media processing commands.

Características Principales

01Deep-dive into position-sensitive options like -ss, -t, and -r

02Standardized templates for multiple input and output handling

03Comprehensive stream specifier syntax for targeting specific tracks

0413 GitHub stars

05Strict enforcement of FFmpeg option ordering (Global > Input > Output)

06Hardware acceleration configuration patterns for CUDA and VAAPI

Casos de Uso

01Generating frame-accurate trimming commands using optimized -ss placement

02Configuring multi-output encoding pipelines with different codecs per file

03Extracting or mapping specific audio and subtitle streams from complex containers

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add josiahsiegel/claude-plugin-marketplace ffmpeg-command-syntax

For use in Claude.ai and ChatGPT

Download Skill