YouTube Subtitle Downloader (Manual Trigger) with TrustedHTML Bypass and Spinner in Polymer Element

Fetch subtitles as SRT with manual trigger, bypass TrustedHTML policy, and insert a button (with spinner) into a Polymer dropdown element

当前为 2025-03-13 提交的版本，查看最新版本。

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作者

lihuelworks

评分

0 0 0

版本

1.3

创建于

2025-03-13

更新于

2025-03-13

大小

8.6 KB

许可证

MIT

适用于

youtube.com

YouTube Subtitle Downloader (Manual Trigger) with TrustedHTML Bypass

Overview

This user script allows you to view YouTube video subtitles in SRT format with a manual trigger. It fetches the most default subtitles (auto-generated or the first available track) using the YouTube API and opens them in a new tab. The script bypasses YouTube's TrustedHTML policy and inserts a button with a spinner into the Polymer dropdown element (as seen in the image below).

Polymer Dropdown Example

Features

Manual Trigger: Click the "Transcription" button to view subtitles.
TrustedHTML Bypass: Handles YouTube's TrustedHTML policy to extract subtitles.
Polymer Button with Spinner: A button with a spinner is injected into the YouTube interface's Polymer dropdown element.
Google API Integration: Uses the YouTube Data API to fetch the video captions (auto-subtitles or the first available subtitle track).

How It Works

The script fetches the subtitles for the current video using the YouTube API.
It extracts the default subtitle track (auto-generated or the first available).
The subtitles are converted to SRT format and opened in a new tab for viewing (not for downloading, though I'm working on it).
A spinner is displayed while the subtitles are being fetched.

Caveats

Editing Polymer is horrible: YouTube's Polymer elements can make dynamic content injection challenging. If any errors happen please let me know.
Pop-up Blockers: Ensure pop-ups are allowed for the download to work properly.
No Download: This script only displays subtitles in a new tab; it does not download them.

Installation

Install Violentmonkey (or compatible userscript manager).
Add this script to your userscript manager.
Visit any YouTube video, click the button seen in the image above and click the "Transcription" button to view subtitles.

Credits

Thanks to Bret Donald for the solution that saved my life!