Fix a batch of dataset defects found in an adversarial review. natural_video_density: manifest.json now carries questions so main.py can load it; add media_config so video_path resolves (this config reuses natural_video's clips); add integer event_start/end_frame and event_timing (measured for EPIC, centered_by_construction for SoccerNet); add clip_sha256 since 89 groups of clips are byte-identical under different names; drop constant margin_s/question_mode; lowercase source_dataset to match natural_video and the licence texts. natural_video: rewrite SoccerNet provenance, whose event position was clip-relative and whose negative windows were placeholders, so the documented reconstruction recipe now works. LICENSES: synthetic-and-easyhuman.txt named files that no longer exist; SoccerNet-NOTE.txt rewritten and corrected. Top-level license is now 'other' (mixed) rather than cc-by-4.0 over NC/NDA content. Croissant: correct descriptions, add FileSets for the mp4s, bump to 2.1.0. Adds media_config to ALL configs so one documented join rule resolves media everywhere.
Add nested manifest.json per config for direct main.py ingestion (co-exists with parquet+NDJSON); fix synthetic_video input_sequence by joining with text-config S_tokens
