Juq-968-engsub Convert02-23-49 Min -

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It is written as a self‑contained document that can be dropped into a product backlog, shared with designers, developers, QA, and stakeholders.

1. Feature Overview Title:  EngSub Time‑Shift & Bulk‑Convert Utility (JUQ‑968) Short name:  EngSub Convert02‑23‑49 Min Goal:  Give power users a fast, precise way to shift the timing of English subtitle files (SRT, VTT, ASS, etc.) by an arbitrary offset—including the specific “02:23:49 min” (≈ 2 h 23 m 49 s) use‑case—while optionally converting between subtitle formats in a single step. Why it matters | Business Impact | User Impact | |-----------------|-------------| | Reduces manual, error‑prone editing of subtitle timestamps (saves ~30 min per file). | Users can sync subtitles to edited video cuts, dubbed tracks, or livestream feeds instantly. | | Enables bulk‑processing of entire series/seasons, opening a new “subtitle‑prep” service offering. | Supports both casual creators (YouTubers, podcasters) and professional post‑production houses. | | Provides a clear, repeatable workflow that can be logged for compliance (e.g., accessibility audits). | Users can preserve original files, generate audit logs, and revert changes if needed. |

2. Scope | In‑Scope | Out‑of‑Scope | |----------|--------------| | • Upload of one or many subtitle files (drag‑&‑drop, file‑picker). | • Automatic language detection (the feature only works on files already identified as English). | | • UI for entering a custom offset (hh:mm:ss, mm:ss, or seconds) or selecting a preset “02:23:49 min” button. | • Real‑time preview of subtitle video playback (requires a video player integration not in this ticket). | | • Choose target format: SRT, VTT, ASS (auto‑detect source). | • Speech‑to‑text generation or translation. | | • Batch conversion (up to 100 files per request). | • Cloud‑side storage beyond the temporary processing window (files are deleted after download). | | • Validation of resulting timestamps (no negative times, no overlap). | • Integration with third‑party subtitle services (e.g., Rev, Amara). | | • Download of processed files individually or as a ZIP archive. | • Desktop‑only offline client (the feature is web‑only). | | • Optional log file (CSV) listing original → new timestamps for each file. | • UI localization (the feature is English‑only for now). | | • Simple progress bar + cancel button. | | JUQ-968-engsub Convert02-23-49 Min

3. User Stories | # | As a … | I want … | So that … | |---|--------|----------|-----------| | US‑1 | Power user who just edited a video | to shift all subtitle timestamps by +02:23:49 (or any offset) | the subtitles line up perfectly with the new video version without manual editing. | | US‑2 | Content creator with many episodes | to drag‑and‑drop a folder of .srt files and apply the same offset to all of them | I can batch‑process an entire season in minutes. | | US‑3 | Accessibility specialist | to convert subtitles from .srt → .vtt (or .ass) while shifting timestamps | the final package meets the platform’s subtitle format requirements. | | US‑4 | QA engineer | to see a preview table of the first 5 subtitle entries before committing | I can verify the offset looks correct and avoid costly re‑uploads. | | US‑5 | Operations manager | to receive a downloadable CSV log of all timestamp changes | we have an audit trail for compliance reports. | | US‑6 | End‑user with a flaky internet connection | to cancel the conversion mid‑process and resume later without losing already processed files | I can continue work when the network stabilizes. |

4. Acceptance Criteria | # | Given | When | Then | |---|-------|------|------| | AC‑1 | The user is on the “EngSub Convert” page | They upload one or more subtitle files and click Convert | The system validates each file (correct extension, well‑formed timestamps) and returns an error list for any invalid file, aborting processing for those files only. | | AC‑2 | The offset field is empty | The user clicks the “02:23:49 Min” shortcut button | The field is auto‑filled with 02:23:49 and the UI shows “+2 h 23 m 49 s”. | | AC‑3 | The user selects .srt as source and .vtt as target | Conversion runs | All timestamps are shifted, the file is rewritten in VTT syntax, and the download name changes to <original‑name>.vtt . | | AC‑4 | Any subtitle line after shifting would become negative (e.g., original 00:00:02 shifted by –00:00:05) | The conversion runs | The system clamps the timestamp to 00:00:00 and flags the line in the preview log with a warning. | | AC‑5 | The user uploads ≥ 1 and ≤ 100 files | The conversion starts | A progress bar shows “Processing X of Y files”, and a Cancel button aborts remaining work while preserving already processed outputs. | | AC‑6 | The conversion finishes successfully | The UI shows Download All (ZIP) and Download Log (CSV) buttons | Clicking either triggers a file‑download with correct MIME types ( application/zip , text/csv ). | | AC‑7 | The user clicks Preview before conversion | The system displays the first 5 subtitle entries after applying the offset (but before format conversion) | The preview table includes original timestamp, new timestamp, and subtitle text. | | AC‑8 | The user has an invalid file (e.g., .txt) | They attempt to process it | The UI shows a clear error “Unsupported file type – only .srt, .vtt, .ass are allowed.” | | AC‑9 | The user’s browser is IE11 (unsupported) | They load the page | The UI displays a friendly “Your browser is not supported – please use Chrome, Edge, or Firefox.” | | AC‑10 | The conversion is completed | The server cleans up temporary files | No processed files remain on the server after 15 minutes or after the user downloads, whichever comes first. |

5. UI / UX Mock‑up (textual description) The Evolution of Online Content: How Technology is

Header – “EngSub Time‑Shift & Bulk Convert (JUQ‑968)”. File Upload Area – Drag‑and‑drop box with “or click to select files”. Shows a list of queued files (name, size). Offset Controls

Text input (hh:mm:ss or seconds). Button “+02:23:49 Min” (pre‑filled offset). +/- toggle to shift forward or backward.

Format Selector – Two dropdowns: Source Format (auto‑detect) & Target Format (SRT, VTT, ASS). Preview Button – Opens a modal with a table of the first 5 entries (original → new timestamp). Action Buttons – Convert , Cancel , Reset . Progress Bar – Shows “File 1/12 – 23 %”. Result Section – After success: “✅ 12 files processed – 2 MB total”. Buttons: Download All (ZIP) , Download Log (CSV) . The Rise of Online Video Content In recent

All components follow the existing design system (primary button = #0066CC, error toast = red, success toast = green).

6. Technical Design | Layer | Details | |-------|---------| | Front‑end | React (v18) functional component EngSubConvert . Uses react-dropzone for uploads, Formik for form validation, and axios for API calls. Shows real‑time progress via Server‑Sent Events (SSE) or WebSocket (fallback to polling). | | Back‑end | Node.js (>=18) + Express. Endpoint: POST /api/engsub/convert . Accepts multipart/form-data . Uses multer for temporary storage (in /tmp/juq968 ). | | Processing Engine | - Parsing : subtitle npm library (supports SRT/VTT/ASS). - Time‑shift : Convert timestamps to seconds, apply offset (signed integer), clamp to ≥ 0, re‑format. - Conversion : Same library’s toVtt() , toAss() , toSrt() . - Batch : Process files sequentially in a worker pool (max 4 concurrent). | | ZIP Generation | archiver library streams output directly to response (no intermediate large buffers). | | Log Generation | Build an array of {fileName, originalStart, newStart} rows; stream to CSV via fast-csv . | | Security | - Validate MIME type and extension. - Size limit: 10 MB per file, 100 MB total per request. - Delete temp files after response ( fs.unlink ). | | Performance | - Expected processing time: ~0.15 s per file (10 MB). - Memory footprint ≤ 50 MB for 100 files. | | Testing | - Unit tests for timestamp conversion (edge cases: midnight roll‑over, negative clamp). - Integration tests for multipart upload, ZIP download, log correctness. - End‑to‑end Cypress test covering UI flow. | | Observability | - Log start/end timestamps, file counts, errors to CloudWatch (or equivalent). - Metrics: juq968_requests_total , juq968_processing_seconds . |