YouTube Dual Subtitles & Quick Translate

Dual-track YouTube dual subtitles with sentence-driven streaming, 60fps zero-delay sync, and instant word lookup with audio replay.

【What's New in v1.2.0】 - Completely fixed subtitle jitter and layout line-wrapping issues. - Introduced sticky dual-slot architecture for live streaming ASR; subtitles no longer collapse to a single row during speaker pauses. - Enhanced built-in caption download compatibility, achieving 100% dual-slot stability. 🎬 YouTube Dual Subtitles & Quick Translate The ultimate dual-subtitles and instant vocabulary translation extension built for language learners and video enthusiasts! ━━━━━━━━━━━━━━━━━━━━━━━━━━━━ ✨ Key Features & Highlights: ━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 🌟 1. Dual-Track Smart Routing Architecture • Track 1 (Standard Videos): Full-video pre-translation with 60fps binary-search frame sync. Seeking is instant with 0ms lag! • Track 2 (Live / Gemini ASR Streams): World-first "Sentence-Driven Dual-Slot Rolling Engine" — - Slot 1 (Upper): Securely holds the previous complete finished sentence (Original + Translation in high-contrast 0.65 dark capsule). - Slot 2 (Lower): Streams currently spoken words smoothly in real time without line jumping, seamlessly promoting to Slot 1 upon sentence completion! ⚡ 2. 60fps Frame Synchronization (Zero-Delay Sync) Replaces standard low-frequency timer loops with requestAnimationFrame (16.6ms precision), eliminating the standard 250ms subtitle lag. 🧠 3. Smart Sentence Merging & ASR Noise Cleaner • Aggregates fragmented speech recognition tokens into natural, grammatically complete sentences. • Automatically purges [Music], [Laughter], [Applause], and >> speaker cues for a distraction-free view. 🔍 4. Word Lookup & Native Video Audio Replay • Highlight any word or phrase directly on the subtitles to pop up an instant glassmorphic dictionary tooltip. • Click "🎬 Play Snippet": The player rewinds and precisely replays the speaker's original voice slice from the video! • Click "🗣️ Speak": Reads the word aloud via TTS synthesis. ⚡ 5. Shadowing Keyboard Shortcuts • [R]: Replay current sentence audio from the video (automatically pauses at the end of the sentence for shadowing!). • [A]: Jump to the beginning of the previous sentence. • [D]: Jump to the beginning of the next sentence. 📱 6. YouTube Shorts Vertical Layout Adaptation Automatically detects Shorts players and dynamically adjusts layout (bottom: 125px) to avoid covering titles and UI buttons. 🔒 7. Privacy & Security First • Zero user tracking: No cookies, browsing history, or personal data collected. • Fully compliant with Chrome Manifest V3 standard. Zero external dependencies.