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Auto-Caption & Subtitle Tool | AI In Action

ChallengesAuto-Caption & Subtitle Tool

OfficialBeginnerAI Video Generation

4-6 hours

Auto-Caption & Subtitle Tool

Build a tool that automatically generates captions and subtitles for videos using speech-to-text AI. Support multiple languages, editable transcript timelines, SRT/VTT export, and styleable burned-in captions with word-level highlighting.

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subtitlesspeech-to-textwhispersrt

Objectives

Extract audio from video and transcribe using speech-to-text AI
Generate time-synced subtitle segments with word-level timestamps
Build an editable transcript editor with timeline scrubbing
Export subtitles in SRT, VTT, and JSON formats
Preview captions overlaid on the original video

Hints

OpenAI Whisper API provides word-level timestamps in the response
Use the Web Audio API to extract audio from video files
SRT format is simple: index, timestamp range, and text per block

Resources

platform.openai.com/docs/guides/speech-to-text
developer.mozilla.org/en-US/docs/Web/API/Web_Audio_API

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