| { |
| "schema_name": "stats_media_json", |
| "schema_version": 1, |
| "artifact": "stats/media.json", |
| "format": "json", |
| "description": "Physical media/storage summary and validation for released MP4 variants. Dataset scale is counted once in stats/summary.json.", |
| "source_artifacts": [ |
| "sample_index.parquet", |
| "row_index.parquet", |
| "manifest.parquet", |
| "shards_manifest_720p.json", |
| "shards_manifest_360p.json", |
| "schema/media.json" |
| ], |
| "fields": [ |
| { |
| "name": "schema_version", |
| "json_type": "integer", |
| "value": 1 |
| }, |
| { |
| "name": "generated_at_utc", |
| "json_type": "string" |
| }, |
| { |
| "name": "dataset_media", |
| "json_type": "object", |
| "description": "Resolution-agnostic media constants for the released dataset." |
| }, |
| { |
| "name": "by_resolution", |
| "json_type": "object", |
| "description": "Physical storage and MP4 validation summary keyed by media variant, e.g. 720p and 360p." |
| }, |
| { |
| "name": "validation", |
| "json_type": "object", |
| "description": "Aggregate media validation checks across all released MP4 members." |
| } |
| ], |
| "dataset_media": { |
| "required_fields": [ |
| "fps", |
| "tick_rate", |
| "audio_channels", |
| "available_resolutions", |
| "canonical_resolution", |
| "training_resolution" |
| ] |
| }, |
| "by_resolution_entry": { |
| "required_fields": [ |
| "role", |
| "video_width", |
| "video_height", |
| "video_codec", |
| "pixel_format", |
| "audio_codec", |
| "audio_profile", |
| "audio_channels", |
| "sample_count", |
| "video_member_count", |
| "shard_count", |
| "shard_bytes", |
| "mp4_bytes", |
| "mean_mp4_bytes", |
| "median_mp4_bytes" |
| ], |
| "optional_fields": [ |
| "derived_from" |
| ] |
| }, |
| "validation_fields": [ |
| "all_videos_decode", |
| "all_videos_have_stereo_audio", |
| "all_videos_faststart", |
| "all_videos_yuv420p", |
| "missing_video_members", |
| "missing_audio_streams", |
| "duration_mismatch_count" |
| ], |
| "validation": [ |
| "dataset_media.available_resolutions includes 720p and 360p", |
| "dataset_media.canonical_resolution == 720p", |
| "dataset_media.training_resolution == 360p", |
| "by_resolution.720p.role == canonical_render", |
| "by_resolution.360p.role == training_convenience_derivative", |
| "by_resolution.360p.derived_from == 720p", |
| "sample_count is identical across released resolutions", |
| "video_member_count == sample_count for each released resolution", |
| "validation.all_videos_decode is true", |
| "validation.all_videos_have_stereo_audio is true", |
| "validation.missing_video_members == 0", |
| "validation.missing_audio_streams == 0" |
| ] |
| } |
|
|
