All translations now derive strictly from the approved English master VTT,
eliminating the cue-count and timestamp drift reported by linguists
(e.g. PL AD = 11 cues vs EN AD = 17 cues).
Key changes:
- Remove video_native translation mode entirely; all languages go through
translate_vtt() which guarantees 1:1 cue alignment with EN master
- Transcreation languages now use translate_vtt(style="transcreate") —
same cue-preserving contract, culturally-adapted instructions
- Post-translation cue alignment validator added (VTTEditor.assert_cue_alignment)
- After ingestion, job moves to PENDING_QC (EN-only) instead of TRANSLATING;
translation pipeline dispatches automatically when EN QC is approved
- New POST /jobs/{id}/retranslate-language endpoint for PM/admin to fix
legacy video_native jobs on demand
- Frontend: origin badge (EN-aligned / transcreated / video-native warning),
EN-first gate banner on target-language cards, Re-translate from EN button
with confirm modal, removed translation mode selector from NewJob
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
- Rewrote VTT translation to two-step (text-only → Gemini → apply to original timestamps) preventing caption timing desync
- Added polling fallback for all processing states and Safari visibilitychange WebSocket reconnect
- Added 11 new TTS languages (cs, da, fi, hu, no, sk, sv, es-419, pt-BR, fr-CA)
- Updated caption/AD prompts to DCMP Captioning Key & Description Key standards (line splitting, ♪ music notation, italic tags, caption positioning, ethics guidelines)
- Added descriptive transcript generation (WCAG 2.1 §1.2.1) combining captions + AD into plain text
- Fixed amix normalize=0 to prevent audio loss in rendered videos
- Fixed AD re-timing double-count when source_ms is None
- Fixed cue block numbering to be 1-based in VttEditor and Timeline Preview
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
