Executive Summary

Problem: many language learners watch videos with burnt-in Chinese subtitles but cannot extract or convert them to pinyin. Solution: a Chrome extension that captures on-screen subtitles in real time, OCRs them, and returns translations and pinyin with learning tools. Short-form and user-generated video consumption has surged, increasing the number of videos with burnt-in subtitles that learners want to mine. The source user reports daily study habits and a paid-workaround search, indicating recurring demand; stage 1 validation flagged habit_frequency and paid_workaround. Browser extension APIs and efficient client-side OCR libraries have matured, and accurate transliteration tools for Chinese pinyin are readily available, making a fast, low-latency real-time subtitle capture feasible now. Creators also frequently hardcode subtitles into videos, increasing the unmet need for extraction tools. Build a platform-agnostic browser extension that hooks into the rendered video layer, runs fast on-device OCR for burnt-in subtitles, and immediately returns pinyin, literal translation, and spaced-repetition export. The source complaint explicitly notes subtitles were "ingrained into the video and not provided as captions" and that "existing extensions that could extract text from video were not effective," showing a product gap for real-time burnt-in subtitle capture. Combining frame-level capture, language-specific transliteration rules for Chinese pinyin, and export to flashcard formats differentiates from generic OCR or caption-only solutions.

Market Opportunity

Capture burnt-in subtitles on video and transliterate to pinyin via browser extension targets a $3.6B = 100M active language learners who consume online video x $3 ARPU per month x 12 months total addressable market with medium saturation and a year-over-year growth rate of 10-20% driven by short-form video consumption and remote/self-study habits.

Key trends driving demand: Short-form video growth -- more language learning opportunities appear inside TikTok, Reels, and YouTube Shorts where subtitles are often burnt into the frame.; Browser-native tooling -- improved extension APIs and client-side OCR reduce latency and privacy concerns compared with server-side processing.; Independent learning growth -- rising adoption of informal learning tools increases willingness to pay small monthly fees for study utilities.; Creator-supplied subtitles -- creators often hardcode subtitles for accessibility or emphasis, increasing demand for extraction tools..

Key competitors include Language Reactor (formerly Language Learning with Netflix), Substital, Copyfish OCR, YouTube auto-captions + Google Translate.

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Capture burnt-in subtitles on video and transliterate to pinyin via browser extension

Executive Summary

Market Validation

Market Opportunity

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