media-mkvtoolnix

Merge, split, extract tracks, and edit MKV metadata without re-encoding.

15|4|Updated Apr 18, 2026

Search Tags:#video-editing #lossless #mkvtoolnix #mkvmerge #mkvextract #mkvpropedit #matroska

Ready to run

npx skills add https://github.com/damionrashford/media-os --skill media-mkvtoolnix

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: media-mkvtoolnix
Source: https://github.com/damionrashford/media-os/tree/main/skills/media-mkvtoolnix
Command: npx skills add https://github.com/damionrashford/media-os --skill media-mkvtoolnix

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes scripts (resource) and references (resource) components.

What problem does it solve?

Matroska (MKV) editing without re-encoding, including merging, splitting, track extraction, and in-place metadata edits using MKVToolNix tools.

Core Features & Use Cases

Lossless MKV editing with mkvmerge, mkvextract, mkvpropedit, and mkvinfo for split/merge, extraction, and metadata changes.
Update track language, default/forced flags, chapters, and attachments without re-encoding; ideal for mergers of rips, fansubs, and archival workflows.
Use cases: merge multiple MKVs, split by timestamps or size, extract a track, modify chapters, or adjust metadata in-place.

Quick Start

Merge two MKV files into a single MKV without re-encoding.

Frequently Asked Questions about media-mkvtoolnix

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I merge multiple MKV files into one without re-encoding?▼

To merge multiple MKV files without re-encoding, use mkvmerge to combine video tracks, audio, and subtitles losslessly. This process consolidates rips or fansubs into a single Matroska container quickly while preserving original quality.

Can I extract audio or subtitle tracks from an MKV file losslessly?▼

Yes, you can extract specific tracks from an MKV file losslessly using mkvextract. This isolates audio, video, subtitles, or attachments from the Matroska container without degrading or modifying the original stream quality.

What is the best way to edit MKV metadata and chapters without video re-encoding?▼

The best way to edit MKV metadata without re-encoding is using mkvpropedit to modify track languages, default flags, and chapters in-place. This updates the Matroska header directly, avoiding lengthy video re-encoding processes.

Do I need MKVToolNix installed to split MKV files by size or timestamps?▼

Yes, you need the MKVToolNix suite installed, specifically mkvmerge, to split MKV files by size or timestamps. The wrapper script orchestrates these commands with safe defaults to divide Matroska archives accurately.

How does lossless MKV editing differ from traditional video editing?▼

Lossless MKV editing modifies the Matroska container directly without re-encoding video or audio streams, preserving original quality and saving time. Traditional video editing decodes and re-encodes streams, often degrading quality and increasing processing time.