# Realign drifting subtitles against finished video audio

> Uses Subaligner to retime an existing subtitle file against the final audio track, then outputs a corrected subtitle asset. This is for subtitle drift, forced alignment, or batch retiming, not for full video editing or general media management.

- Skill: `agentskillexchange/realign-drifting-subtitles-against-finished-video-audio` (Agent Skill)
- Install (CLI): `npx skillmds@latest add agentskillexchange/realign-drifting-subtitles-against-finished-video-audio`
- Raw SKILL.md: https://api.skillmd.com/api/skills/agentskillexchange/realign-drifting-subtitles-against-finished-video-audio/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: agentskillexchange (https://skillmd.com/u/agentskillexchange)
- Updated: 2026-09-08
- Page: https://skillmd.com/skills/agentskillexchange/realign-drifting-subtitles-against-finished-video-audio

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# Realign drifting subtitles against finished video audio

Uses Subaligner to retime an existing subtitle file against the final audio track, then outputs a corrected subtitle asset. This is for subtitle drift, forced alignment, or batch retiming, not for full video editing or general media management.

## Prerequisites

FFmpeg

## Installation

Requirements and caveats from upstream:
- [![python](https://img.shields.io/badge/python-3.8%20%7C%203.9%20%7C%203.10%20%7C%203.11%20%7C%203.12-blue)](https://www.python.org/)
- [![Docker Pulls](https://img.shields.io/docker/pulls/baxtree/subaligner)](https://hub.docker.com/r/baxtree/subaligner)
- Note that subaligner[stretch], subaligner[dev] and subaligner[harmony] require [eSpeak](https://espeak.sourceforge.net/) to be pre-installed:

Basic usage or getting-started notes:
- <details>
- <summary>Install dependencies for enabling translation and transcription</summary>
- <pre><code>pip install 'subaligner[llm]'</code></pre>

- Source: https://github.com/baxtree/subaligner
- Extracted from upstream docs: https://raw.githubusercontent.com/baxtree/subaligner/HEAD/README.md

## Documentation

- https://subaligner.readthedocs.io/en/latest/

## Source

- [Agent Skill Exchange](https://agentskillexchange.com/skills/realign-drifting-subtitles-against-finished-video-audio/)