{
  "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"
  ]
}