Juq-968-engsub Convert02-23-49 Min

| Issue | Reason | Fix | |-------|--------|-----| | Subtitle disappears after conversion | MP4 only supports mov_text. Using -c:s copy on an ass/srt track will drop it. | Use -c:s mov_text (or -c:s srt for MKV). | | Audio sync drift | Different framerates or variable‑frame‑rate (VFR) video. | Add -vsync 2 or -fflags +genpts. | | File size too large | Low CRF (high quality) or high audio bitrate. | Increase CRF (e.g., 24) or lower audio bitrate (-b:a 128k). | | Hard‑coded subtitles look blurry | Source subtitle is a bitmap (PGS) at low resolution. | Upscale with -vf "scale=1920:1080" before burning, or extract and OCR to text before re‑encoding. | | Container mismatch (e.g., trying to put mov_text subtitles into MKV) | MKV expects text subtitles in SRT/ASS, not mov_text. | For MKV, use -c:s srt or -c:s ass. |

| 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. |

| Risk | Impact | Mitigation | |------|--------|------------| | Large batch (100 × 10 MB) overwhelms server memory. | Crash / OOM. | Use streaming processing, limit concurrent workers, enforce per‑file size cap. | | Incorrect offset sign (user expects negative but UI defaults to positive). | Wrong subtitles, user frustration. | Add explicit +/- toggle and tooltip explaining sign. | | Subtitle files with malformed timestamps. | Conversion fails for entire batch. | Validate each file individually; skip only the faulty file and report it. | | Browser compatibility for large file uploads. | Users on older browsers can’t use the feature. | Show graceful fallback message, encourage modern browsers. | | Temporary files left on disk (security). | Data leakage. | Automated deletion after response or after 15 min via a cleanup cron job. | JUQ-968-engsub Convert02-23-49 Min

In the depths of my computer, a mystery resides, A file named JUQ-968, with subtitles inside, engsub it reads, a story to reveal, Of digital journeys, where bytes and bits conceal.

Convert02-23-49, a timestamp in its name, A moment in time, preserved in digital flame, Minutes pass, and files transform, From ones and zeros to art and form. | Issue | Reason | Fix | |-------|--------|-----|

In this vast digital landscape, I roam, Seeking answers, in files I call home, A world of wonder, hidden from sight, Where files whisper secrets, through day and night.

Despite legal risks, files with codes like “JUQ-968-engsub Convert02-23-49 Min” appear on forums, peer-to-peer networks, and direct download sites. Reasons include: | Layer | Details | |-------|---------| | Front‑end

If you're looking for information on the content of "JUQ-968-engsub," I can suggest a few points:

| Dep | Reason | |-----|--------| | subtitle npm package (v2.1.0) | Parsing & format conversion. | | archiver (v5.3.0) | Streaming ZIP creation. | | fast-csv (v5.0.0) | CSV log streaming. | | Existing auth middleware | Only logged‑in users can access this endpoint. | | Front‑end design system (shared UI library) | For consistent button, input, toast styling. |

While the technical act of converting a video and adding subtitles is neutral, distributing copyrighted material without compensation harms the creators, actors, and studios.