[WIP] Lossless storage migration (WebP / PNG-9 / NPY)
#2
by Narendhiranv04 - opened
Scope
Storage-only, decoded-value-lossless migration of the published 110,000-frame MOS/SOS release.
- RGB and fisheye: PNG -> lossless WebP
- Depth and masks: lossless PNG recompressed at level 9
- Camera pose: NPZ wrapper ->
(7,) float64NPY - Masks auxiliary data and SAM2 metadata: exact existing tar bytes reused
- Optional unpublished ego tars remain excluded; ego metadata remains intact
Audited locally before upload
- 2,590 tar shards / 1,451,790 members
- 660,000 transformed files round-trip verified
- 1,451,790 per-member SHA-256 entries and 2,590 tar SHA-256 entries
- 740 untouched tars exactly match current main; exactly 1,850 expected tars change
- Schema v2 and all unrelated metadata preserved
- 24 task/split manifests generated with WebP/PNG/NPY paths
- Original local 249.67 GB source re-hashed after the run: zero changes
- 784 benchmark tests passed (4 expected skips)
Logical member storage changes from 248.52 GB to 212.97 GB (35.55 GB / 14.30% smaller).
Rollback tag: pre-lossless-2026-06-28 at ec3439fb19f30290c08c188b4210213b49bf43aa.
This PR remains unmerged until the uploaded revision passes remote inventory, hash, metadata, clean-download, and Dataset Viewer checks.
jishnup changed pull request status to open
Remote release validation passed before merge:
- 2,590/2,590 tar paths present; all remote sizes and SHA-256 values match the verified local release.
- 194/194 metadata files present; all substantive files are byte-identical to staging (Hub-only
.gitattributesadditions are LFS rules). - 2,590 tar checksums and 1,451,790 member checksums reconcile exactly.
- Clean-cache download of RGB, depth, fisheye L/R, masks, and cam pose round-trips to the original values with zero difference.
- Dataset Viewer reports valid, with no pending or failed splits.
- No unpublished
egotar paths are included. - Rollback tag
pre-lossless-2026-06-28remains pinned to the previous main commit.
Merging after all release gates passed.
Narendhiranv04 changed pull request status to merged