feat: subtitle/caption export (SRT + WebVTT)#184
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Add a self-contained, stdlib-only subtitles.py that converts timestamped transcript segments into SubRip (.srt) and WebVTT (.vtt) captions. - Segment dataclass as a tiny input contract (also accepts duck-typed objects with .start/.end/.text), independent of transcribe.py - to_srt / to_vtt render formatted text; write_srt / write_vtt write files - Correct timestamp formatting: SRT HH:MM:SS,mmm, VTT HH:MM:SS.mmm, sequential SRT indices, WEBVTT header, hours>0, sub-second, multi-line - Edge cases: empty input, negative-time clamp, millisecond rounding, CRLF normalization - 21 unit tests in tests/test_subtitles.py; interrogate 100% Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01CJRVbDrp1vGYkJgNHMGPpG
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Why
Captions/subtitles are a high-value output for recorded audio/video — searchable, accessible, embeddable. This adds a self-contained module to turn timestamped transcript segments into
.srtand.vttfiles.What
subtitles.py(stdlib-only, no new dependency; independent — does not import the transcription module).Segmentdataclass input contract (also accepts duck-typed objects with.start/.end/.text).to_srt/to_vtt(return text) andwrite_srt/write_vtt(write files). SRTHH:MM:SS,mmm+ 1-based indices; VTTHH:MM:SS.mmm+WEBVTTheader. Handles empty input, sub-second, hours>0, multi-line, negative clamp, ms rounding.Tests
tests/test_subtitles.py— 21 tests (formats, indices, headers, empty, hour-plus, rounding, duck-typing, file roundtrips).interrogate100%; full suite no new failures.🤖 Generated with Claude Code