| # Validation Report |
|
|
| ## Scope |
|
|
| The v0.3 release candidate retains the v0.2 media membership and validates: |
|
|
| - all 338 canonical Standard rows and direct Standard MP4 paths |
| - all 129 active Pre-Standard rows and direct Pre-Standard MP4 paths |
| - persistent record identity and cross-tier uniqueness |
| - exact Hub Xet file IDs and stored byte sizes |
| - container-header technical metadata for every active published MP4 |
| - repository membership, filename rules, field types, numeric ranges, and |
| stored-orientation consistency |
|
|
| No video payload was replaced, renamed, transcoded, or uploaded in this |
| metadata-only release candidate. Pre-Standard technical properties were read |
| from the existing public MP4 headers using HTTP range requests. Sizes and |
| content identities were read from the Hub repository inventory. |
|
|
| ## Result |
|
|
| **PASS — zero structural validation errors** |
|
|
| | Check | Result | |
| | --- | ---: | |
| | Active indexed rows | 467 | |
| | Canonical Standard rows | 338 | |
| | Pre-Standard rows | 129 | |
| | Metadata columns per index | 29 | |
| | Unique persistent `record_id` values | 467 | |
| | Unique nonblank content hashes | 467 | |
| | Complete encoded-video metadata | 467/467 | |
| | Canonical repository paths matched | 338/338 | |
| | Pre-Standard repository paths matched | 129/129 | |
| | Stored-orientation conflicts | 0 | |
| | Duplicate active content hashes | 0 | |
|
|
| Both Hub builder configurations explicitly declare the same 29 features. This |
| prevents per-CSV inference from representing an integer-only canonical |
| `encoded_frame_rate` column as `int64` while representing historical |
| fractional rates as `float64` in the Pre-Standard configuration. |
|
|
| ## Audited statistics |
|
|
| - Total indexed playback duration: 50.06 hours |
| - Canonical playback duration: 40.46 hours |
| - Pre-Standard playback duration: 9.60 hours |
| - Median active-record playback duration: 345.722 seconds |
| - Total indexed video size: 1.885 TB decimal |
| - Stored orientation: 455 portrait, 12 landscape |
| - Audio streams: 462 present, 5 absent |
| - Unknown finish dates: 9 |
| - Unknown finish times: 59 |
|
|
| ## Outstanding warnings |
|
|
| 1. Fifteen canonical 30×40 records use `support = Paper`, while |
| `Archive_Specifications.md` describes the 30×40 support as Illustration |
| Board. The curator must determine whether the rows or the specification are |
| wrong; this release candidate does not manufacture a correction. |
| 2. Five Pre-Standard records retain `time = 00:00` while their finish date is |
| unknown. Confirm whether those are documented midnight times or historical |
| placeholders before normalizing them. |
| 3. Two Pre-Standard records retain incomplete material fields because the |
| filename evidence is insufficient or ambiguous. |
| 4. Most masters retain an audio stream. Stream presence does not establish |
| meaningful signal, and rights/privacy review remains necessary. |
| 5. Encoded frame rate is playback rate and cannot be used as original |
| drawing-time sampling. |
| 6. The 2012–2016 layer has no public video payload at this snapshot. |
| 7. Separate Hub configurations prevent tier mixing, but no leakage-safe |
| train/validation/test partition has been defined. |
|
|
| ## Reproduction |
|
|
| Validate both active indexes: |
|
|
| ```bash |
| python tools/validate_metadata.py metadata.csv \ |
| --pre-standard-metadata Pre_Standard_Time_Lapses/metadata.csv |
| ``` |
|
|
| For the strongest repository-inventory check, first augment the pinned Hub API |
| JSON with the Xet file IDs returned by the same revision's resolve headers: |
|
|
| ```bash |
| python tools/capture_hub_inventory.py \ |
| --repo-json repo_api_blobs.json \ |
| --revision 5bd5b715e59e2b5943ecac85b1b6c7de4d03184c \ |
| --output repo_inventory_xet.json |
| ``` |
|
|
| Then validate paths, Xet identities, and exact byte sizes together: |
|
|
| ```bash |
| python tools/validate_metadata.py metadata.csv \ |
| --pre-standard-metadata Pre_Standard_Time_Lapses/metadata.csv \ |
| --repo-inventory-json repo_inventory_xet.json |
| ``` |
|
|
| A plain JSON list of repository paths is also accepted through the legacy |
| `--repo-files-json` spelling, but that checks membership only; it cannot |
| independently verify hashes or byte sizes. |
|
|
| Use `--viewer-json` only with a Viewer snapshot produced from the same |
| repository revision and configuration under review. |
|
|
| The Pre-Standard technical enrichment is reproducible from a pinned Hub API |
| response containing `siblings` with LFS metadata and an FFmpeg executable: |
|
|
| ```bash |
| python tools/enrich_prestandard.py \ |
| --metadata Pre_Standard_Time_Lapses/metadata.csv \ |
| --repo-json repo_inventory_xet.json \ |
| --revision 5bd5b715e59e2b5943ecac85b1b6c7de4d03184c \ |
| --ffmpeg /path/to/ffmpeg \ |
| --cache prestandard_probe_cache.json \ |
| --output Pre_Standard_Time_Lapses/metadata.csv |
| ``` |
|
|
| The revision is intentionally explicit: reproducing against a moving branch |
| would weaken both identity and technical-metadata claims. |
|
|
| The canonical v0.2 index remains reproducible from its pinned 335-row source |
| plus the three audited additions: |
|
|
| ```bash |
| python tools/repair_metadata.py source_metadata.csv metadata.csv \ |
| --additions tools/metadata_additions_v0.2.csv |
| ``` |
|
|
