Create TikTok/CapCut-style burned-in English video captions with short phrase-level timing, selected keyword highlights, ASS/SRT outputs, and ffmpeg verification. Use when Codex needs to add or revise subtitles for vertical social videos, commerce clips, TikTok/Reels/Shorts edits, or when the user asks for "TikTok same style captions", "重点词高亮字幕", "不要逐词高亮", or non-overlapping highlighted English captions.
