Building SRT and VTT Subtitle Files from YouTube Captions in Code

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A developer guide explains how to fetch YouTube captions programmatically and convert them into SRT and VTT subtitle files for editors, players, and web pages. It contrasts the two formats, noting SRT numbers cues and uses a comma for milliseconds while VTT uses a WEBVTT header and dots. The walkthrough shows a transcript API that can return both formats directly, with Python code to save paired files per video. The author notes that outputs were tested against a public YouTube transcript Actor using the first YouTube video, while the endpoint's response envelope comes from documentation. A key timing quirk is highlighted: auto-generated caption segments often overlap, so cues may need adjusting to produce valid files that players handle correctly.

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