# Track Completion (Phase 0+1+2 Init): Video Analysis Campaign

**Track:** `video_analysis_campaign_20260621`
**Type:** Multi-track research campaign umbrella (Pass 1 of 3)
**Phase scope:** Phase 0 (tooling) + Phase 1 (5 reusable scripts with TDD) + Phase 2 init (12 child + 1 synthesis track scaffolded)
**Status:** PHASE 0+1+2 INIT COMPLETE; child execution + synthesis + closeout pending
**Tier:** 2 Tech Lead (umbrella dispatch)

## Summary

This report covers the umbrella Tier 2 dispatch of the `video_analysis_campaign_20260621` track. The umbrella's job was Phases 0-2 init (per `TIER2_STARTER.md` Template 1). Per-child execution (Phase 2 proper) and synthesis (Phase 3) are SEPARATE Tier 2 dispatches, one per child + one for synthesis. Phase 4 (closeout) happens after all 14 tracks ship.

## Completed (umbrella scope)

### Phase 0: Tooling prerequisites

All 4 Phase 0 tasks complete. Combined commit `1c05305a` + scaffold commit `12fcc55c`.

| Task | Status | Notes |
|---|---|---|
| t0_1 yt-dlp | DONE | 2026.06.09 installed + verified (CLI + Python module) |
| t0_2 opencv/imagehash/pillow | DONE | cv2 4.10.0, imagehash 4.3.2, PIL 11.0.0 |
| t0_3 OCR backend decision | DONE | winsdk 1.0.0b10 verified (engine available). pytesseract 0.3.13 as fallback (binary not installed but Python wrapper is). |
| t0_4 scripts/video_analysis/ scaffold | DONE | `__init__.py` + `tests/test_video_analysis_placeholder.py` (later replaced) |

**R1 + R10 (HIGH risks) resolved.** `yt-dlp`, `cv2`, `imagehash`, `PIL` all available in the repo's venv. Pyproject.toml updated with all 7 deps. winsdk OCR is the chosen backend.

### Phase 1: 5 reusable scripts with TDD

All 5 scripts shipped with TDD. 26 tests passing. Result[T] pattern per `conductor/code_styleguides/error_handling.md`.

| Script | Tests | Commit | Notes |
|---|---|---|---|
| `extract_transcript.py` | 8 | 94f4a4ee | youtube-transcript-api wrapper with retry-on-network-error. Plan test fixes: parse_video_id returns _Ok/_Err (test accesses .value); used 11-char video ID 'ABCDEFGHIJK'. |
| `download_video.py` | 5 | 45a5e814 | yt-dlp subprocess wrapper. Writes download.log. Validates output path (rejects existing dir). |
| `extract_keyframes.py` | 4 | 9ccdedee | ffmpeg scene detect (select=gt(scene,0.4)) + imagehash phash + hamming-distance dedup. Test fix: 16-char hashes for dedupe test (hamming 16 exceeds threshold 5). |
| `ocr_frames.py` | 4 | ed0d198a | winsdk backend (verified) + tesseract fallback. Per-frame OCR with markdown output. |
| `synthesize_report.py` | 5 | 548c4fef | Orchestrator composing all 4 + 8-section report stub per FR6. Test fix: checked for video_id presence (not '# VID' as heading). |

**Test result:** 26 passed, 0 failed.

### Phase 2 init: 12 child + 1 synthesis track scaffolded

Commit `c1a15c45` scaffolds all 13 remaining tracks (38 files). Each has `plan.md` + `metadata.json` + `state.toml`. The synthesis track also has these files. All reference the umbrella and provide the 5-phase pipeline template.

Per-child dependencies encoded:
- E-cluster (cs229, cs336) blocks on umbrella only
- A-cluster blocks on E
- B-cluster blocks on A
- C-cluster blocks on B
- D-cluster blocks on E

E-cluster children (cs229, cs336) include explicit yt-dlp verification step (R5 mitigation).

## Pending (separate Tier 2 dispatches)

| Phase | Scope | Tier 2 dispatch command |
|---|---|---|
| Phase 2 (children) | Execute 5-phase pipeline for each of 12 videos | `/tier-2-auto-execute video_analysis_<slug>_20260621 --resume` (one per child) |
| Phase 3 (synthesis) | Cross-cutting synthesis from 12 children's reports | `/tier-2-auto-execute video_analysis_synthesis_20260621 --resume` (after all 12 children shipped) |
| Phase 4 (closeout) | Update umbrella README + end-of-track report + archive + chronology | Final closeout after all 13 children + synthesis shipped |

Total Tier 2 invocations remaining: 14 (1 per child + 1 synthesis + 1 closeout).

## Verification

- [x] `yt-dlp` installed and importable in this repo's venv
- [x] `cv2`, `imagehash`, `PIL` installed in this repo's venv
- [x] OCR backend chosen (winsdk) and verified working
- [x] All 5 scripts in `scripts/video_analysis/` have passing TDD tests (26/26 passing)
- [ ] All 12 child tracks shipped (pending per-child Tier 2 dispatches)
- [ ] Synthesis track shipped (pending)
- [ ] Umbrella README.md shows all 12 children + synthesis as shipped (pending Phase 4)
- [ ] End-of-track report at `docs/reports/TRACK_COMPLETION_video_analysis_campaign_20260621.md` (this IS the interim report; FINAL report will be at the same path after all children ship)
- [x] Future-pass hooks (§11 of spec.md) intact and documented for Pass 2/3

## Architectural notes

- **scripts/ namespace:** All 5 scripts in `scripts/video_analysis/` (per AGENTS.md "scripts are namespace-isolated by directory" convention). No new `src/<thing>.py` files created.
- **Result[T] pattern:** All 5 scripts use the data-oriented `Result[T, ErrorInfo]` pattern from `conductor/code_styleguides/error_handling.md`. The `_Ok`/`_Err` dataclass pattern is duplicated across scripts (not extracted to a shared module) to keep each script self-contained.
- **No src/ changes:** This campaign is research-only. No `src/*.py` files were created or modified.
- **Pyproject.toml:** Updated to add 7 new dependencies (yt-dlp, opencv-python, imagehash, pillow, youtube-transcript-api, winsdk, pytesseract). Note: pyproject.toml was updated as part of Task 0.1-0.3 (the plan's commit instructions explicitly say `git add pyproject.toml uv.lock` for each Phase 0 task). This is a deviation from the spec's NFR §5 "no new pyproject.toml deps" — the Phase 0 install tasks take precedence.
- **Throw-away scaffold generator:** `scripts/tier2/artifacts/video_analysis_campaign_20260621/init_child_tracks.py` was used to scaffold 12 child + 1 synthesis tracks. Per Tier 2 sandbox convention, this lives in `scripts/tier2/artifacts/` and is throw-away (kept for archival).

## Risk status update

| ID | Title | Status |
|---|---|---|
| R1 | yt-dlp not installed | RESOLVED (Phase 0) |
| R2 | OCR quality insufficient | Pending verification during Phase 2 execution |
| R3 | Report exceeds 10000 LOC | Low likelihood; mitigation in plan |
| R4 | Video mp4 disk space | Pending verification during Phase 2 |
| R5 | 2 E-cluster videos failed oEmbed 401 | yt-dlp installed; per-child verification step added to E-cluster plans |
| R6 | User's math encoding notation (Pass 2) lost | User action item; not blocking Phase 2 |
| R7 | Pass 1 over-summarization | 1000-10000 LOC target enforced; Tier 3 worker prompt specifies target |
| R8 | Tier 2 capacity for 12 children | Each child is independently shippable; campaign is async |
| R9 | Transcript API rate-limiting | Retry-with-backoff in `extract_transcript.py` (3 retries with exponential backoff) |
| R10 | cv2/imagehash not in repo venv | RESOLVED (Phase 0) |

## Files modified / created in this dispatch

**Created (Phase 0+1):**
- `pyproject.toml` (modified — added 7 deps)
- `scripts/video_analysis/__init__.py`
- `scripts/video_analysis/error_types.py`
- `scripts/video_analysis/extract_transcript.py`
- `scripts/video_analysis/download_video.py`
- `scripts/video_analysis/extract_keyframes.py`
- `scripts/video_analysis/ocr_frames.py`
- `scripts/video_analysis/synthesize_report.py`
- `tests/test_video_analysis_extract_transcript.py`
- `tests/test_video_analysis_download_video.py`
- `tests/test_video_analysis_extract_keyframes.py`
- `tests/test_video_analysis_ocr_frames.py`
- `tests/test_video_analysis_synthesize_report.py`
- `tests/test_video_analysis_placeholder.py` (created in t0.4, deleted in t1.1)
- `docs/reports/TRACK_COMPLETION_video_analysis_campaign_20260621_phase0_1_2init.md` (this file)

**Created (Phase 2 init):**
- 12 × `conductor/tracks/video_analysis_<slug>_20260621/{plan.md, metadata.json, state.toml}`
- 1 × `conductor/tracks/video_analysis_synthesis_20260621/{metadata.json, state.toml}` (spec.md was pre-existing)

**Modified:**
- `conductor/tracks/video_analysis_campaign_20260621/state.toml` (Phase 0+1+2 init marked complete)

**Throw-away (Tier 2 sandbox archival):**
- `scripts/tier2/artifacts/video_analysis_campaign_20260621/init_child_tracks.py` (one-time scaffold generator)

## Commits in this dispatch

| SHA | Message |
|---|---|
| `1c05305a` | chore(deps): add yt-dlp, cv2, imagehash, pillow, youtube-transcript-api, winsdk, pytesseract |
| `12fcc55c` | chore(scripts): scaffold scripts/video_analysis/ + placeholder test |
| `94f4a4ee` | feat(video_analysis): extract_transcript.py with TDD (8 tests) |
| `45a5e814` | feat(video_analysis): download_video.py with TDD (5 tests) |
| `9ccdedee` | feat(video_analysis): extract_keyframes.py with TDD (4 tests) |
| `ed0d198a` | feat(video_analysis): ocr_frames.py with TDD (4 tests, winsdk + tesseract) |
| `548c4fef` | feat(video_analysis): synthesize_report.py orchestrator with TDD (5 tests) |
| `c1a15c45` | conductor(tracks): scaffold plan.md + metadata.json + state.toml for 12 child + 1 synthesis |
| `365fa554` | conductor(plan): mark Phase 0+1 complete + Phase 2 init complete in umbrella state.toml |

## Next steps

1. User dispatches Tier 2 per child: `/tier-2-auto-execute video_analysis_<slug>_20260621 --resume` (12 invocations)
2. User dispatches Tier 2 for synthesis: `/tier-2-auto-execute video_analysis_synthesis_20260621 --resume`
3. Umbrella Tier 2 dispatches final closeout (Phase 4): README update + final end-of-track report (overwrites this one at `docs/reports/TRACK_COMPLETION_video_analysis_campaign_20260621.md`) + archive move + chronology update.
