How I Finally Got SRT Files from the YouTube Data API (Undocumented Fix)

As part of my Human in the Loop experiment, I'm building a searchable archive of everything I've said across 100+ videos. To do that, I needed SRT transcript files pulled directly from YouTube via Make.com. Turns out the official API documentation sends you in completely the wrong direction.

🔥 THE PROBLEM: The YouTube Captions API download endpoint doesn't work as documented. Following the official instructions returns an error every time. The fix is a single undocumented URL parameter — and it took a deep research session on Perplexity to find it.

💡 THE SOLUTION: Adding alt=media to the end of your API call forces the endpoint to return the binary SRT file rather than attempting to serve JSON. One parameter. That's it.

What I show:

• Why the standard YouTube Captions download endpoint fails and what error you get
• The exact Make.com module sequence to retrieve captions with the snippet (and why you need it for language filtering)
• The undocumented alt=media parameter that makes it work
• The full output — a properly formatted SRT file with timestamps pushed to Google Docs

📺 Chapters:
00:00 Why I Need SRT Files (The Use Case)
01:00 Building a Searchable Video Archive
01:45 The Make.com Module Sequence
02:30 Why the Official API Documentation Fails
03:15 The alt=media Fix
04:00 Live Demo - SRT Output in Google Docs
04:45 What the Binary vs JSON Difference Actually Means

KEY INSIGHT: The YouTube Data API documentation actively misleads you on caption downloads. The alt=media parameter forces binary output — without it, the API attempts to return JSON and throws an error. This isn't documented anywhere obvious; it surfaced via deep research rather than official docs.

🎯 THE RESULT: Full SRT files with timestamps now extractable at scale from any video on the channel — without expensive third-party scrapers like Apify.

🔗 Full write-up with all the endpoints and the complete module breakdown:
https://www.digitisingevents.com/how-tos-and-tips/youtube-srt-download-undocumented-alt-media-fix

📊 Human in the Loop AI Series:
Part of my ongoing experiment surrounding myself with AI to see how far productivity and capability can be pushed as a one-person operation. This is the kind of problem-solving that compounds — build the archive once, link to precise timestamps forever.

🎯 Subscribe for more: real automation builds, honest platform assessments, and the stuff that's actually missing from the documentation.

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Видео How I Finally Got SRT Files from the YouTube Data API (Undocumented Fix) канала Digitising Events - AI With Human In The Loop