{
  "schema_name": "sample_metadata_json",
  "schema_version": 4,
  "artifact_suffix": ".json",
  "format": "json",
  "row_grain": "one metadata sidecar per WebDataset sample",
  "description": "Minimal public metadata needed to identify, align, mask, and filter one WebDataset sample. Detailed action/state/event field contracts live in schema/actions_bin.json, schema/state_bin.json, and schema/events.json.",
  "privacy_boundary": {
    "contains_steam_ids": false,
    "contains_online_account_ids": false,
    "raw_demo_files_redistributed": false,
    "contains_player_names": false,
    "player_reference": "pov_idx is stable only within a match_id and is not stable across matches"
  },
  "required_fields": [
    "metadata_schema_version",
    "actions_schema_version",
    "state_schema_version",
    "events_schema_version",
    "postprocess_version",
    "sample_key",
    "match_id",
    "round_idx",
    "round_id",
    "pov_idx",
    "team_side",
    "map_slug",
    "resolution",
    "video_width",
    "video_height",
    "clip_start_tick",
    "clip_end_tick",
    "round_start_tick",
    "round_decision_tick",
    "round_stop_tick",
    "round_winner",
    "round_end_reason",
    "pov_round_result",
    "frame0_tick",
    "frame_tick_stride",
    "frames",
    "fps",
    "duration_s",
    "tick_rate",
    "alive_start_tick",
    "alive_end_tick",
    "alive_start_frame",
    "alive_end_frame",
    "alive_frames",
    "alive_duration_s",
    "survival_fraction",
    "has_full_round",
    "ended_by",
    "primary_weapon_id",
    "weapon_ids_present"
  ],
  "fields": [
    {
      "name": "metadata_schema_version",
      "type": "int32",
      "description": "Version of this metadata sidecar contract."
    },
    {
      "name": "actions_schema_version",
      "type": "int32",
      "description": "Expected actions_bin schema version."
    },
    {
      "name": "state_schema_version",
      "type": "int32",
      "description": "Expected state_bin schema version."
    },
    {
      "name": "events_schema_version",
      "type": "int32",
      "description": "Expected sample events JSON schema version."
    },
    {
      "name": "sample_key",
      "type": "string",
      "description": "Shared WebDataset member prefix: match_{match_id}__r{round_idx:03d}__p{pov_idx:02d}."
    },
    {
      "name": "match_id",
      "type": "string",
      "description": "Release match-map id, normally a 12-character hash prefix."
    },
    {
      "name": "round_idx",
      "type": "int32",
      "description": "Zero-indexed round number within match_id."
    },
    {
      "name": "round_id",
      "type": "string",
      "description": "Stable join id for all POV samples belonging to the same round: match_{match_id}__r{round_idx:03d}."
    },
    {
      "name": "pov_idx",
      "type": "int32",
      "description": "Anonymized player POV id, stable within match_id."
    },
    {
      "name": "team_side",
      "type": "enum<T,CT,empty>",
      "description": "Player side at clip_start_tick."
    },
    {
      "name": "map_slug",
      "type": "enum<anubis,ancient,dust2,inferno,mirage,nuke,overpass,empty>",
      "description": "Stable map enum. Human-readable display names live in schema/maps.json."
    },
    {
      "name": "resolution",
      "type": "enum<720p,360p,empty>",
      "description": "Release media profile label. Exact dimensions are video_width/video_height."
    },
    {
      "name": "video_width",
      "type": "int32",
      "description": "Decoded video width in pixels. Must match schema/media.json for resolution."
    },
    {
      "name": "video_height",
      "type": "int32",
      "description": "Decoded video height in pixels. Must match schema/media.json for resolution."
    },
    {
      "name": "clip_start_tick",
      "type": "int64",
      "description": "Inclusive sample start tick."
    },
    {
      "name": "clip_end_tick",
      "type": "int64",
      "description": "Exclusive sample end tick."
    },
    {
      "name": "round_start_tick",
      "type": "int64",
      "description": "Canonical round start tick, normally round_freeze_end."
    },
    {
      "name": "round_decision_tick",
      "type": "int64",
      "description": "Tick at which the round outcome was decided, normally round_end."
    },
    {
      "name": "round_stop_tick",
      "type": "int64",
      "description": "Round window stop tick after post-round buffer, normally round_officially_ended when available."
    },
    {
      "name": "round_winner",
      "type": "enum<T,CT,empty>",
      "description": "Team that won the round, from round_end.winner."
    },
    {
      "name": "round_end_reason",
      "type": "string",
      "description": "Sanitized round_end.reason value when available."
    },
    {
      "name": "pov_round_result",
      "type": "enum<win,loss,unknown,empty>",
      "description": "Result of this POV's team in the round, derived from team_side and round_winner."
    },
    {
      "name": "frame0_tick",
      "type": "int64",
      "description": "Demo tick aligned to decoded video frame 0."
    },
    {
      "name": "frame_tick_stride",
      "type": "int32",
      "description": "Tick stride per video frame. Current release target is 2 for 64 Hz ticks at 32 FPS."
    },
    {
      "name": "frames",
      "type": "int32",
      "description": "Decoded video frame count and expected actions.bin/state.bin record count."
    },
    {
      "name": "fps",
      "type": "float32",
      "description": "Video frame rate. Current release target is 32."
    },
    {
      "name": "duration_s",
      "type": "float32",
      "description": "Sample duration in seconds."
    },
    {
      "name": "tick_rate",
      "type": "int32",
      "description": "Demo tick rate. Current release target is 64."
    },
    {
      "name": "alive_start_tick",
      "type": "int64",
      "description": "First tick in the sample where this POV is considered alive."
    },
    {
      "name": "alive_end_tick",
      "type": "int64",
      "description": "Exclusive alive boundary for this POV. For deaths, this is the death tick; for surviving POVs, this is clip_end_tick or round_stop_tick."
    },
    {
      "name": "alive_start_frame",
      "type": "int32",
      "description": "First frame where player_alive is true."
    },
    {
      "name": "alive_end_frame",
      "type": "int32",
      "description": "Exclusive end frame where player_alive is true."
    },
    {
      "name": "alive_frames",
      "type": "int32",
      "description": "alive_end_frame - alive_start_frame."
    },
    {
      "name": "alive_duration_s",
      "type": "float32",
      "description": "Alive tick window duration in seconds."
    },
    {
      "name": "survival_fraction",
      "type": "float32",
      "description": "alive_frames / frames."
    },
    {
      "name": "has_full_round",
      "type": "bool",
      "description": "Whether this POV sample reaches round_stop_tick."
    },
    {
      "name": "ended_by",
      "type": "enum<death,round_stop,clip_end,unknown,empty>",
      "description": "Reason this POV sample ended. round_stop means the POV survived to the canonical round window stop."
    },
    {
      "name": "media_truncated",
      "type": "bool",
      "description": "True when the corrected round/death-tail window extends beyond the rendered MP4 and v12 sidecars were clipped to the available media. Filter this out for strict full-round training."
    },
    {
      "name": "intended_clip_end_tick",
      "type": "int64|null",
      "description": "Corrected exclusive clip end tick before clipping to rendered media. Present only when media_truncated is true."
    },
    {
      "name": "primary_weapon_id",
      "type": "int32",
      "description": "Most frequent non-unknown active_weapon_id in the sample."
    },
    {
      "name": "weapon_ids_present",
      "type": "list<int32>",
      "description": "Sorted unique non-unknown active_weapon_id values present in the sample."
    },
    {
      "name": "postprocess_version",
      "type": "string",
      "description": "Post-processor version that produced this sidecar and paired binary artifacts. v12 splits controls into actions.bin and state into state.bin."
    },
    {
      "name": "death_tick",
      "type": "int64|null",
      "description": "POV death tick when ended_by is death; absent/null for surviving POVs."
    },
    {
      "name": "death_frame",
      "type": "int32|null",
      "description": "Video frame aligned to death_tick when death_tick is inside the sample frame window."
    },
    {
      "name": "round_number_in_match",
      "type": "int32",
      "description": "One-indexed round number within match_id."
    },
    {
      "name": "half_idx",
      "type": "int32",
      "description": "0 for first half, 1 for second half, and higher values for overtime blocks."
    },
    {
      "name": "is_first_round",
      "type": "bool",
      "description": "True for round_idx == 0."
    },
    {
      "name": "is_pistol_round",
      "type": "bool",
      "description": "True for regulation pistol rounds and overtime pistol-reset rounds."
    },
    {
      "name": "t_score_start",
      "type": "int32",
      "description": "T-side score at the start of the sample/round."
    },
    {
      "name": "ct_score_start",
      "type": "int32",
      "description": "CT-side score at the start of the sample/round."
    },
    {
      "name": "score_diff_start",
      "type": "int32",
      "description": "t_score_start - ct_score_start."
    },
    {
      "name": "primary_weapon_category",
      "type": "string",
      "description": "Most frequent coarse active weapon category in the sample."
    },
    {
      "name": "weapon_categories_present",
      "type": "list<string>",
      "description": "Sorted unique coarse weapon categories present in the sample."
    },
    {
      "name": "start_weapon_id",
      "type": "int32",
      "description": "active_weapon_id on the first frame."
    },
    {
      "name": "start_weapon_category",
      "type": "string",
      "description": "Coarse active weapon category on the first frame."
    },
    {
      "name": "start_health",
      "type": "int32",
      "description": "Health on the first frame."
    },
    {
      "name": "start_armor",
      "type": "int32",
      "description": "Armor value on the first frame."
    },
    {
      "name": "start_has_helmet",
      "type": "bool",
      "description": "Whether the POV has helmet armor on the first frame."
    },
    {
      "name": "start_has_defuser",
      "type": "bool",
      "description": "Whether the POV has a defuse kit on the first frame."
    },
    {
      "name": "start_balance",
      "type": "int32",
      "description": "Player money on the first frame when available."
    },
    {
      "name": "start_has_bomb",
      "type": "bool",
      "description": "Whether the POV is carrying C4 on the first frame."
    },
    {
      "name": "has_awp",
      "type": "bool",
      "description": "True if the AWP appears as active_weapon_id at any frame in the sample."
    },
    {
      "name": "has_sniper",
      "type": "bool",
      "description": "True if any sniper-category weapon appears in the sample."
    },
    {
      "name": "has_rifle",
      "type": "bool",
      "description": "True if any rifle-category weapon appears in the sample."
    },
    {
      "name": "contains_bomb_plant",
      "type": "bool",
      "description": "True if the sample event sidecar contains a bomb_planted event."
    },
    {
      "name": "contains_bomb_defuse",
      "type": "bool",
      "description": "True if the sample event sidecar contains a bomb_defused event."
    },
    {
      "name": "contains_bomb_explosion",
      "type": "bool",
      "description": "True if the sample event sidecar contains a bomb_exploded event."
    },
    {
      "name": "contains_player_death",
      "type": "bool",
      "description": "True if the sample event sidecar contains at least one player_death event."
    },
    {
      "name": "sample_kills_total",
      "type": "int32",
      "description": "Number of player_death events in this sample."
    },
    {
      "name": "sample_headshots_total",
      "type": "int32",
      "description": "Number of headshot player_death events in this sample."
    },
    {
      "name": "pov_kills",
      "type": "int32",
      "description": "Kills credited to this POV within the sample event window."
    },
    {
      "name": "pov_deaths",
      "type": "int32",
      "description": "Deaths of this POV within the sample event window."
    },
    {
      "name": "pov_assists",
      "type": "int32",
      "description": "Assists credited to this POV within the sample event window."
    },
    {
      "name": "pov_blinds_caused",
      "type": "int32",
      "description": "Blind events caused by this POV within the sample event window."
    },
    {
      "name": "pov_blinded",
      "type": "int32",
      "description": "Blind events affecting this POV within the sample event window."
    }
  ],
  "validation": [
    "metadata_schema_version == 4",
    "actions_schema_version == 9",
    "state_schema_version == 1",
    "events_schema_version == 3",
    "sample_key matches match_{match_id}__r{round_idx:03d}__p{pov_idx:02d}",
    "round_id matches match_{match_id}__r{round_idx:03d}",
    "resolution is 720p or 360p for final release shards",
    "video_width/video_height match schema/media.json for resolution",
    "clip_start_tick < clip_end_tick",
    "round_start_tick <= round_decision_tick <= round_stop_tick",
    "frame0_tick == clip_start_tick for the v1 release",
    "frame_tick_stride == 2 for final release shards",
    "frames > 0",
    "duration_s > 0",
    "fps == 32 for final release shards",
    "tick_rate == 64 for final release shards",
    "clip_start_tick <= alive_start_tick <= alive_end_tick <= clip_end_tick",
    "media_truncated == false implies intended_clip_end_tick is absent/null",
    "media_truncated == true implies clip_end_tick < intended_clip_end_tick",
    "0 <= alive_start_frame <= alive_end_frame <= frames",
    "alive_frames == alive_end_frame - alive_start_frame",
    "has_full_round == (clip_end_tick >= round_stop_tick)",
    "pov_round_result is win/loss when team_side and round_winner are known",
    "ended_by is one of death, round_stop, clip_end, unknown, or empty",
    "no top-level field is named clip_id, start_tick, end_tick, map, player_id, player_name, actions_bin, state_bin, or events_json",
    "no serialized field value contains steamid, xuid, accountid, profile URL, hltv_match_id, raw demo path, raw demo URL, event name, or team names"
  ]
}