Add reviewed EgoHOS/shared-v1.0 files 1-128

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+    "random_access": "sequential decode from beginning"
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+  "segment": {
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+        "command": [
+          "ffmpeg",
+          "-hide_banner",
+          "-loglevel",
+          "error",
+          "-y",
+          "-f",
+          "rawvideo",
+          "-pixel_format",
+          "gray16le",
+          "-video_size",
+          "1440x1080",
+          "-framerate",
+          "1",
+          "-i",
+          "pipe:0",
+          "-an",
+          "-c:v",
+          "ffv1",
+          "-level",
+          "3",
+          "-pix_fmt",
+          "gray16le",
+          "outputs/EgoHOS-full/shared-v1.0/data/test_indomain_1440x1080_000000/ego/annotation/segment/mask.ffv1.mkv"
+        ]
+      }
+    ],
+    "failed_candidates": [],
+    "pixel_coverage": "ALL frames, count and order",
+    "random_access": "sequential decode from beginning"
+  }
+}

EgoHOS/shared-v1.0/data/test_indomain_1440x1080_000000/ego/metainfo.json

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+{
+  "schema_version": "hand-warehouse/1.0",
+  "dataset_id": "EgoHOS",
+  "release_id": "shared-v1.0",
+  "sequence_id": "test_indomain_1440x1080_000000",
+  "camera_id": "ego",
+  "sample_type": "image",
+  "num_frames": 128,
+  "hand_slots": [
+    "left",
+    "right"
+  ],
+  "view_type": "ego",
+  "split": "test",
+  "sampling": {
+    "type": "independent",
+    "source_fps": null,
+    "frames_ref": "camera/frames.jsonl",
+    "strategy": "full",
+    "seed": 20260928,
+    "timestamps": "unknown; no timestamps inferred from filenames or MKV PTS"
+  },
+  "camera": {
+    "model": "unknown",
+    "schema_id": null,
+    "image_size": [
+      1440,
+      1080
+    ]
+  },
+  "components": {
+    "rgb": {
+      "available": true,
+      "schema_id": "rgb/uint8/v1",
+      "data_ref": "observation/rgb.mkv",
+      "axes": [
+        "T",
+        "height",
+        "width",
+        "RGB"
+      ],
+      "valid_ref": "observation/rgb_valid.pt",
+      "valid_axes": [
+        "T"
+      ],
+      "provenance": {
+        "kind": "format_conversion",
+        "method": "exact source JPEG remux or exact RGB round-trip re-encoding"
+      },
+      "source_locator": {
+        "file": "camera/frames.jsonl",
+        "field": "source_locator",
+        "records": "all frame_index rows"
+      },
+      "storage": {
+        "profile": "mkv/mjpeg_copy/v1",
+        "codec": "mjpeg",
+        "pixel_format": "yuvj420p",
+        "encoded_size": [
+          1440,
+          1080
+        ],
+        "storage_fps": 1,
+        "timebase_role": "index_only",
+        "source_lossy": true,
+        "decoder": {
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+          "version": "18.1.0",
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+              3,
+              102
+            ]
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+          "output": "rgb24",
+          "rotation": "none",
+          "color_interpretation": "libswscale source metadata/defaults; identical source/target decoder",
+          "source_color_space": "unknown"
+        },
+        "encoder_parameters": {
+          "name": "copy",
+          "stream_copy": true,
+          "ffmpeg_version": "ffmpeg version 6.1.1-3ubuntu5 Copyright (c) 2000-2023 the FFmpeg developers",
+          "crf": null,
+          "gop": null
+        }
+      }
+    },
+    "segment": {
+      "available": true,
+      "schema_id": "segment/uint16_labels/v1",
+      "data_ref": "annotation/segment/mask.mkv",
+      "axes": [
+        "T",
+        "height",
+        "width"
+      ],
+      "valid_ref": "annotation/segment/mask_valid.pt",
+      "valid_axes": [
+        "T"
+      ],
+      "provenance": {
+        "kind": "format_conversion",
+        "method": "source 0 background -> 9; 1..8 unchanged; exact uint16 round-trip"
+      },
+      "source_locator": {
+        "file": "camera/frames.jsonl",
+        "field": "mask_source_locator"
+      },
+      "storage": {
+        "profile": "mkv/uint16_ffv1/v1",
+        "codec": "ffv1",
+        "pixel_format": "gray16le",
+        "encoded_size": [
+          1440,
+          1080
+        ],
+        "storage_fps": 1,
+        "timebase_role": "index_only",
+        "source_lossy": false,
+        "decoder": {
+          "name": "PyAV",
+          "version": "18.1.0",
+          "libraries": {
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+          "output": "gray16le",
+          "rotation": "none",
+          "color_interpretation": "libswscale source metadata/defaults; identical source/target decoder",
+          "source_color_space": "unknown"
+        },
+        "encoder_parameters": {
+          "name": "ffv1",
+          "stream_copy": false,
+          "ffmpeg_version": "ffmpeg version 6.1.1-3ubuntu5 Copyright (c) 2000-2023 the FFmpeg developers",
+          "crf": null,
+          "gop": null
+        }
+      },
+      "segmentation_type": "semantic",
+      "mapping_ref": "annotation/segment/instances.jsonl",
+      "coverage": {
+        "kind": "partial",
+        "meaning": "hands and selected interacting object categories; background is source task background, not exhaustive object annotation"
+      },
+      "valid_policy": {
+        "rule": "paired source label exists, shape and integer categories verified; no additional official QA supplied",
+        "local_excluded_frame_indices": []
+      }
+    },
+    "depth": {
+      "available": false,
+      "reason": "not provided by selected source image release"
+    },
+    "mano": {
+      "available": false,
+      "reason": "not exported: model profile/flat-hand-mean/translation conversion not empirically verified"
+    },
+    "visibility": {
+      "available": false,
+      "reason": "no independent source visibility input; never inferred from valid"
+    },
+    "contact": {
+      "available": false,
+      "reason": "raw package lacks contact/; interaction-order categories are not per-entity contact labels"
+    },
+    "intrinsic": {
+      "available": false,
+      "reason": "source calibration absent"
+    },
+    "extrinsic": {
+      "available": false,
+      "reason": "source calibration absent"
+    },
+    "keypoints": {
+      "available": false,
+      "reason": "source keypoints absent"
+    },
+    "object": {
+      "available": false,
+      "reason": "semantic classes do not establish instance identity/mesh/pose"
+    }
+  },
+  "split_scheme": "EgoHOS-official-four-directories",
+  "split_source_locator": {
+    "file": "camera/frames.jsonl",
+    "field": "source_locator",
+    "records": "all frame_index rows"
+  }
+}

EgoHOS/shared-v1.0/data/test_indomain_1440x1080_000000/ego/observation/rgb.mkv

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EgoHOS/shared-v1.0/data/test_indomain_1440x1080_000000/ego/observation/rgb_valid.pt

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EgoHOS/shared-v1.0/data/test_indomain_1440x1080_000001/ego/annotation/segment/mask.mkv

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EgoHOS/shared-v1.0/data/test_indomain_1440x1080_000001/ego/annotation/segment/mask_valid.pt

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EgoHOS/shared-v1.0/data/test_indomain_1440x1080_000001/ego/encoding_validation.json

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+        ]
+      }
+    ],
+    "failed_candidates": [],
+    "pixel_coverage": "ALL frames, count and order",
+    "random_access": "sequential decode from beginning"
+  },
+  "segment": {
+    "selected": "ffv1",
+    "candidates": [
+      {
+        "encoder": "ffv1",
+        "bytes": 2199878,
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+        ],
+        "decode_verify_seconds": 1.187385672000346,
+        "command": [
+          "ffmpeg",
+          "-hide_banner",
+          "-loglevel",
+          "error",
+          "-y",
+          "-f",
+          "rawvideo",
+          "-pixel_format",
+          "gray16le",
+          "-video_size",
+          "1440x1080",
+          "-framerate",
+          "1",
+          "-i",
+          "pipe:0",
+          "-an",
+          "-c:v",
+          "ffv1",
+          "-level",
+          "3",
+          "-pix_fmt",
+          "gray16le",
+          "outputs/EgoHOS-full/shared-v1.0/data/test_indomain_1440x1080_000001/ego/annotation/segment/mask.ffv1.mkv"
+        ]
+      }
+    ],
+    "failed_candidates": [],
+    "pixel_coverage": "ALL frames, count and order",
+    "random_access": "sequential decode from beginning"
+  }
+}

EgoHOS/shared-v1.0/data/test_indomain_1440x1080_000001/ego/metainfo.json

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+{
+  "schema_version": "hand-warehouse/1.0",
+  "dataset_id": "EgoHOS",
+  "release_id": "shared-v1.0",
+  "sequence_id": "test_indomain_1440x1080_000001",
+  "camera_id": "ego",
+  "sample_type": "image",
+  "num_frames": 128,
+  "hand_slots": [
+    "left",
+    "right"
+  ],
+  "view_type": "ego",
+  "split": "test",
+  "sampling": {
+    "type": "independent",
+    "source_fps": null,
+    "frames_ref": "camera/frames.jsonl",
+    "strategy": "full",
+    "seed": 20260928,
+    "timestamps": "unknown; no timestamps inferred from filenames or MKV PTS"
+  },
+  "camera": {
+    "model": "unknown",
+    "schema_id": null,
+    "image_size": [
+      1440,
+      1080
+    ]
+  },
+  "components": {
+    "rgb": {
+      "available": true,
+      "schema_id": "rgb/uint8/v1",
+      "data_ref": "observation/rgb.mkv",
+      "axes": [
+        "T",
+        "height",
+        "width",
+        "RGB"
+      ],
+      "valid_ref": "observation/rgb_valid.pt",
+      "valid_axes": [
+        "T"
+      ],
+      "provenance": {
+        "kind": "format_conversion",
+        "method": "exact source JPEG remux or exact RGB round-trip re-encoding"
+      },
+      "source_locator": {
+        "file": "camera/frames.jsonl",
+        "field": "source_locator",
+        "records": "all frame_index rows"
+      },
+      "storage": {
+        "profile": "mkv/mjpeg_copy/v1",
+        "codec": "mjpeg",
+        "pixel_format": "yuvj420p",
+        "encoded_size": [
+          1440,
+          1080
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+        "storage_fps": 1,
+        "timebase_role": "index_only",
+        "source_lossy": true,
+        "decoder": {
+          "name": "PyAV",
+          "version": "18.1.0",
+          "libraries": {
+            "libavutil": [
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+              26,
+              102
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+            "libswresample": [
+              6,
+              3,
+              102
+            ]
+          },
+          "output": "rgb24",
+          "rotation": "none",
+          "color_interpretation": "libswscale source metadata/defaults; identical source/target decoder",
+          "source_color_space": "unknown"
+        },
+        "encoder_parameters": {
+          "name": "copy",
+          "stream_copy": true,
+          "ffmpeg_version": "ffmpeg version 6.1.1-3ubuntu5 Copyright (c) 2000-2023 the FFmpeg developers",
+          "crf": null,
+          "gop": null
+        }
+      }
+    },
+    "segment": {
+      "available": true,
+      "schema_id": "segment/uint16_labels/v1",
+      "data_ref": "annotation/segment/mask.mkv",
+      "axes": [
+        "T",
+        "height",
+        "width"
+      ],
+      "valid_ref": "annotation/segment/mask_valid.pt",
+      "valid_axes": [
+        "T"
+      ],
+      "provenance": {
+        "kind": "format_conversion",
+        "method": "source 0 background -> 9; 1..8 unchanged; exact uint16 round-trip"
+      },
+      "source_locator": {
+        "file": "camera/frames.jsonl",
+        "field": "mask_source_locator"
+      },
+      "storage": {
+        "profile": "mkv/uint16_ffv1/v1",
+        "codec": "ffv1",
+        "pixel_format": "gray16le",
+        "encoded_size": [
+          1440,
+          1080
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+        "storage_fps": 1,
+        "timebase_role": "index_only",
+        "source_lossy": false,
+        "decoder": {
+          "name": "PyAV",
+          "version": "18.1.0",
+          "libraries": {
+            "libavutil": [
+              60,
+              26,
+              102
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+            "libavcodec": [
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+              28,
+              102
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+              102
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+          "output": "gray16le",
+          "rotation": "none",
+          "color_interpretation": "libswscale source metadata/defaults; identical source/target decoder",
+          "source_color_space": "unknown"
+        },
+        "encoder_parameters": {
+          "name": "ffv1",
+          "stream_copy": false,
+          "ffmpeg_version": "ffmpeg version 6.1.1-3ubuntu5 Copyright (c) 2000-2023 the FFmpeg developers",
+          "crf": null,
+          "gop": null
+        }
+      },
+      "segmentation_type": "semantic",
+      "mapping_ref": "annotation/segment/instances.jsonl",
+      "coverage": {
+        "kind": "partial",
+        "meaning": "hands and selected interacting object categories; background is source task background, not exhaustive object annotation"
+      },
+      "valid_policy": {
+        "rule": "paired source label exists, shape and integer categories verified; no additional official QA supplied",
+        "local_excluded_frame_indices": []
+      }
+    },
+    "depth": {
+      "available": false,
+      "reason": "not provided by selected source image release"
+    },
+    "mano": {
+      "available": false,
+      "reason": "not exported: model profile/flat-hand-mean/translation conversion not empirically verified"
+    },
+    "visibility": {
+      "available": false,
+      "reason": "no independent source visibility input; never inferred from valid"
+    },
+    "contact": {
+      "available": false,
+      "reason": "raw package lacks contact/; interaction-order categories are not per-entity contact labels"
+    },
+    "intrinsic": {
+      "available": false,
+      "reason": "source calibration absent"
+    },
+    "extrinsic": {
+      "available": false,
+      "reason": "source calibration absent"
+    },
+    "keypoints": {
+      "available": false,
+      "reason": "source keypoints absent"
+    },
+    "object": {
+      "available": false,
+      "reason": "semantic classes do not establish instance identity/mesh/pose"
+    }
+  },
+  "split_scheme": "EgoHOS-official-four-directories",
+  "split_source_locator": {
+    "file": "camera/frames.jsonl",
+    "field": "source_locator",
+    "records": "all frame_index rows"
+  }
+}

EgoHOS/shared-v1.0/data/test_indomain_1440x1080_000001/ego/observation/rgb.mkv

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EgoHOS/shared-v1.0/data/test_indomain_1440x1080_000001/ego/observation/rgb_valid.pt

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EgoHOS/shared-v1.0/data/test_indomain_1440x1080_000002/ego/annotation/segment/mask.mkv

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EgoHOS/shared-v1.0/data/test_indomain_1440x1080_000002/ego/annotation/segment/mask_valid.pt

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EgoHOS/shared-v1.0/data/test_indomain_1440x1080_000002/ego/encoding_validation.json

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+    "failed_candidates": [],
+    "pixel_coverage": "ALL frames, count and order",
+    "random_access": "sequential decode from beginning"
+  },
+  "segment": {
+    "selected": "ffv1",
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+        "command": [
+          "ffmpeg",
+          "-hide_banner",
+          "-loglevel",
+          "error",
+          "-y",
+          "-f",
+          "rawvideo",
+          "-pixel_format",
+          "gray16le",
+          "-video_size",
+          "1440x1080",
+          "-framerate",
+          "1",
+          "-i",
+          "pipe:0",
+          "-an",
+          "-c:v",
+          "ffv1",
+          "-level",
+          "3",
+          "-pix_fmt",
+          "gray16le",
+          "outputs/EgoHOS-full/shared-v1.0/data/test_indomain_1440x1080_000002/ego/annotation/segment/mask.ffv1.mkv"
+        ]
+      }
+    ],
+    "failed_candidates": [],
+    "pixel_coverage": "ALL frames, count and order",
+    "random_access": "sequential decode from beginning"
+  }
+}

EgoHOS/shared-v1.0/data/test_indomain_1440x1080_000002/ego/metainfo.json

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+{
+  "schema_version": "hand-warehouse/1.0",
+  "dataset_id": "EgoHOS",
+  "release_id": "shared-v1.0",
+  "sequence_id": "test_indomain_1440x1080_000002",
+  "camera_id": "ego",
+  "sample_type": "image",
+  "num_frames": 126,
+  "hand_slots": [
+    "left",
+    "right"
+  ],
+  "view_type": "ego",
+  "split": "test",
+  "sampling": {
+    "type": "independent",
+    "source_fps": null,
+    "frames_ref": "camera/frames.jsonl",
+    "strategy": "full",
+    "seed": 20260928,
+    "timestamps": "unknown; no timestamps inferred from filenames or MKV PTS"
+  },
+  "camera": {
+    "model": "unknown",
+    "schema_id": null,
+    "image_size": [
+      1440,
+      1080
+    ]
+  },
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+      "schema_id": "rgb/uint8/v1",
+      "data_ref": "observation/rgb.mkv",
+      "axes": [
+        "T",
+        "height",
+        "width",
+        "RGB"
+      ],
+      "valid_ref": "observation/rgb_valid.pt",
+      "valid_axes": [
+        "T"
+      ],
+      "provenance": {
+        "kind": "format_conversion",
+        "method": "exact source JPEG remux or exact RGB round-trip re-encoding"
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+      "source_locator": {
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+        "field": "source_locator",
+        "records": "all frame_index rows"
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+        "codec": "mjpeg",
+        "pixel_format": "yuvj420p",
+        "encoded_size": [
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+          1080
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+        "storage_fps": 1,
+        "timebase_role": "index_only",
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+          "output": "rgb24",
+          "rotation": "none",
+          "color_interpretation": "libswscale source metadata/defaults; identical source/target decoder",
+          "source_color_space": "unknown"
+        },
+        "encoder_parameters": {
+          "name": "copy",
+          "stream_copy": true,
+          "ffmpeg_version": "ffmpeg version 6.1.1-3ubuntu5 Copyright (c) 2000-2023 the FFmpeg developers",
+          "crf": null,
+          "gop": null
+        }
+      }
+    },
+    "segment": {
+      "available": true,
+      "schema_id": "segment/uint16_labels/v1",
+      "data_ref": "annotation/segment/mask.mkv",
+      "axes": [
+        "T",
+        "height",
+        "width"
+      ],
+      "valid_ref": "annotation/segment/mask_valid.pt",
+      "valid_axes": [
+        "T"
+      ],
+      "provenance": {
+        "kind": "format_conversion",
+        "method": "source 0 background -> 9; 1..8 unchanged; exact uint16 round-trip"
+      },
+      "source_locator": {
+        "file": "camera/frames.jsonl",
+        "field": "mask_source_locator"
+      },
+      "storage": {
+        "profile": "mkv/uint16_ffv1/v1",
+        "codec": "ffv1",
+        "pixel_format": "gray16le",
+        "encoded_size": [
+          1440,
+          1080
+        ],
+        "storage_fps": 1,
+        "timebase_role": "index_only",
+        "source_lossy": false,
+        "decoder": {
+          "name": "PyAV",
+          "version": "18.1.0",
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+          "output": "gray16le",
+          "rotation": "none",
+          "color_interpretation": "libswscale source metadata/defaults; identical source/target decoder",
+          "source_color_space": "unknown"
+        },
+        "encoder_parameters": {
+          "name": "ffv1",
+          "stream_copy": false,
+          "ffmpeg_version": "ffmpeg version 6.1.1-3ubuntu5 Copyright (c) 2000-2023 the FFmpeg developers",
+          "crf": null,
+          "gop": null
+        }
+      },
+      "segmentation_type": "semantic",
+      "mapping_ref": "annotation/segment/instances.jsonl",
+      "coverage": {
+        "kind": "partial",
+        "meaning": "hands and selected interacting object categories; background is source task background, not exhaustive object annotation"
+      },
+      "valid_policy": {
+        "rule": "paired source label exists, shape and integer categories verified; no additional official QA supplied",
+        "local_excluded_frame_indices": []
+      }
+    },
+    "depth": {
+      "available": false,
+      "reason": "not provided by selected source image release"
+    },
+    "mano": {
+      "available": false,
+      "reason": "not exported: model profile/flat-hand-mean/translation conversion not empirically verified"
+    },
+    "visibility": {
+      "available": false,
+      "reason": "no independent source visibility input; never inferred from valid"
+    },
+    "contact": {
+      "available": false,
+      "reason": "raw package lacks contact/; interaction-order categories are not per-entity contact labels"
+    },
+    "intrinsic": {
+      "available": false,
+      "reason": "source calibration absent"
+    },
+    "extrinsic": {
+      "available": false,
+      "reason": "source calibration absent"
+    },
+    "keypoints": {
+      "available": false,
+      "reason": "source keypoints absent"
+    },
+    "object": {
+      "available": false,
+      "reason": "semantic classes do not establish instance identity/mesh/pose"
+    }
+  },
+  "split_scheme": "EgoHOS-official-four-directories",
+  "split_source_locator": {
+    "file": "camera/frames.jsonl",
+    "field": "source_locator",
+    "records": "all frame_index rows"
+  }
+}

EgoHOS/shared-v1.0/data/test_indomain_1440x1080_000002/ego/observation/rgb.mkv

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+size 21815911

EgoHOS/shared-v1.0/data/test_indomain_1440x1080_000002/ego/observation/rgb_valid.pt

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EgoHOS/shared-v1.0/data/test_indomain_1920x1080_000000/ego/annotation/segment/mask.mkv

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EgoHOS/shared-v1.0/data/test_indomain_1920x1080_000000/ego/annotation/segment/mask_valid.pt

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EgoHOS/shared-v1.0/data/test_indomain_1920x1080_000000/ego/encoding_validation.json

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+        "command": [
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+          "-f",
+          "rawvideo",
+          "-pixel_format",
+          "gray16le",
+          "-video_size",
+          "1920x1080",
+          "-framerate",
+          "1",
+          "-i",
+          "pipe:0",
+          "-an",
+          "-c:v",
+          "ffv1",
+          "-level",
+          "3",
+          "-pix_fmt",
+          "gray16le",
+          "outputs/EgoHOS-full/shared-v1.0/data/test_indomain_1920x1080_000000/ego/annotation/segment/mask.ffv1.mkv"
+        ]
+      }
+    ],
+    "failed_candidates": [],
+    "pixel_coverage": "ALL frames, count and order",
+    "random_access": "sequential decode from beginning"
+  }
+}

EgoHOS/shared-v1.0/data/test_indomain_1920x1080_000000/ego/metainfo.json

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+{
+  "schema_version": "hand-warehouse/1.0",
+  "dataset_id": "EgoHOS",
+  "release_id": "shared-v1.0",
+  "sequence_id": "test_indomain_1920x1080_000000",
+  "camera_id": "ego",
+  "sample_type": "image",
+  "num_frames": 96,
+  "hand_slots": [
+    "left",
+    "right"
+  ],
+  "view_type": "ego",
+  "split": "test",
+  "sampling": {
+    "type": "independent",
+    "source_fps": null,
+    "frames_ref": "camera/frames.jsonl",
+    "strategy": "full",
+    "seed": 20260928,
+    "timestamps": "unknown; no timestamps inferred from filenames or MKV PTS"
+  },
+  "camera": {
+    "model": "unknown",
+    "schema_id": null,
+    "image_size": [
+      1920,
+      1080
+    ]
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+      "schema_id": "rgb/uint8/v1",
+      "data_ref": "observation/rgb.mkv",
+      "axes": [
+        "T",
+        "height",
+        "width",
+        "RGB"
+      ],
+      "valid_ref": "observation/rgb_valid.pt",
+      "valid_axes": [
+        "T"
+      ],
+      "provenance": {
+        "kind": "format_conversion",
+        "method": "exact source JPEG remux or exact RGB round-trip re-encoding"
+      },
+      "source_locator": {
+        "file": "camera/frames.jsonl",
+        "field": "source_locator",
+        "records": "all frame_index rows"
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+      "storage": {
+        "profile": "mkv/mjpeg_copy/v1",
+        "codec": "mjpeg",
+        "pixel_format": "yuvj420p",
+        "encoded_size": [
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+          1080
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+        "storage_fps": 1,
+        "timebase_role": "index_only",
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+        "decoder": {
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+          "output": "rgb24",
+          "rotation": "none",
+          "color_interpretation": "libswscale source metadata/defaults; identical source/target decoder",
+          "source_color_space": "unknown"
+        },
+        "encoder_parameters": {
+          "name": "copy",
+          "stream_copy": true,
+          "ffmpeg_version": "ffmpeg version 6.1.1-3ubuntu5 Copyright (c) 2000-2023 the FFmpeg developers",
+          "crf": null,
+          "gop": null
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+    "segment": {
+      "available": true,
+      "schema_id": "segment/uint16_labels/v1",
+      "data_ref": "annotation/segment/mask.mkv",
+      "axes": [
+        "T",
+        "height",
+        "width"
+      ],
+      "valid_ref": "annotation/segment/mask_valid.pt",
+      "valid_axes": [
+        "T"
+      ],
+      "provenance": {
+        "kind": "format_conversion",
+        "method": "source 0 background -> 9; 1..8 unchanged; exact uint16 round-trip"
+      },
+      "source_locator": {
+        "file": "camera/frames.jsonl",
+        "field": "mask_source_locator"
+      },
+      "storage": {
+        "profile": "mkv/uint16_ffv1/v1",
+        "codec": "ffv1",
+        "pixel_format": "gray16le",
+        "encoded_size": [
+          1920,
+          1080
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+        "storage_fps": 1,
+        "timebase_role": "index_only",
+        "source_lossy": false,
+        "decoder": {
+          "name": "PyAV",
+          "version": "18.1.0",
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+          "rotation": "none",
+          "color_interpretation": "libswscale source metadata/defaults; identical source/target decoder",
+          "source_color_space": "unknown"
+        },
+        "encoder_parameters": {
+          "name": "ffv1",
+          "stream_copy": false,
+          "ffmpeg_version": "ffmpeg version 6.1.1-3ubuntu5 Copyright (c) 2000-2023 the FFmpeg developers",
+          "crf": null,
+          "gop": null
+        }
+      },
+      "segmentation_type": "semantic",
+      "mapping_ref": "annotation/segment/instances.jsonl",
+      "coverage": {
+        "kind": "partial",
+        "meaning": "hands and selected interacting object categories; background is source task background, not exhaustive object annotation"
+      },
+      "valid_policy": {
+        "rule": "paired source label exists, shape and integer categories verified; no additional official QA supplied",
+        "local_excluded_frame_indices": []
+      }
+    },
+    "depth": {
+      "available": false,
+      "reason": "not provided by selected source image release"
+    },
+    "mano": {
+      "available": false,
+      "reason": "not exported: model profile/flat-hand-mean/translation conversion not empirically verified"
+    },
+    "visibility": {
+      "available": false,
+      "reason": "no independent source visibility input; never inferred from valid"
+    },
+    "contact": {
+      "available": false,
+      "reason": "raw package lacks contact/; interaction-order categories are not per-entity contact labels"
+    },
+    "intrinsic": {
+      "available": false,
+      "reason": "source calibration absent"
+    },
+    "extrinsic": {
+      "available": false,
+      "reason": "source calibration absent"
+    },
+    "keypoints": {
+      "available": false,
+      "reason": "source keypoints absent"
+    },
+    "object": {
+      "available": false,
+      "reason": "semantic classes do not establish instance identity/mesh/pose"
+    }
+  },
+  "split_scheme": "EgoHOS-official-four-directories",
+  "split_source_locator": {
+    "file": "camera/frames.jsonl",
+    "field": "source_locator",
+    "records": "all frame_index rows"
+  }
+}

EgoHOS/shared-v1.0/data/test_indomain_1920x1080_000000/ego/observation/rgb.mkv

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EgoHOS/shared-v1.0/data/test_indomain_1920x1080_000000/ego/observation/rgb_valid.pt

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EgoHOS/shared-v1.0/data/test_indomain_1920x1440_000000/ego/annotation/segment/mask.mkv

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EgoHOS/shared-v1.0/data/test_indomain_1920x1440_000000/ego/annotation/segment/mask_valid.pt

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EgoHOS/shared-v1.0/data/test_indomain_1920x1440_000000/ego/encoding_validation.json

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+    "random_access": "sequential decode from beginning"
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+  "segment": {
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+        "command": [
+          "ffmpeg",
+          "-hide_banner",
+          "-loglevel",
+          "error",
+          "-y",
+          "-f",
+          "rawvideo",
+          "-pixel_format",
+          "gray16le",
+          "-video_size",
+          "1920x1440",
+          "-framerate",
+          "1",
+          "-i",
+          "pipe:0",
+          "-an",
+          "-c:v",
+          "ffv1",
+          "-level",
+          "3",
+          "-pix_fmt",
+          "gray16le",
+          "outputs/EgoHOS-full/shared-v1.0/data/test_indomain_1920x1440_000000/ego/annotation/segment/mask.ffv1.mkv"
+        ]
+      }
+    ],
+    "failed_candidates": [],
+    "pixel_coverage": "ALL frames, count and order",
+    "random_access": "sequential decode from beginning"
+  }
+}

EgoHOS/shared-v1.0/data/test_indomain_1920x1440_000000/ego/metainfo.json

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+{
+  "schema_version": "hand-warehouse/1.0",
+  "dataset_id": "EgoHOS",
+  "release_id": "shared-v1.0",
+  "sequence_id": "test_indomain_1920x1440_000000",
+  "camera_id": "ego",
+  "sample_type": "image",
+  "num_frames": 128,
+  "hand_slots": [
+    "left",
+    "right"
+  ],
+  "view_type": "ego",
+  "split": "test",
+  "sampling": {
+    "type": "independent",
+    "source_fps": null,
+    "frames_ref": "camera/frames.jsonl",
+    "strategy": "full",
+    "seed": 20260928,
+    "timestamps": "unknown; no timestamps inferred from filenames or MKV PTS"
+  },
+  "camera": {
+    "model": "unknown",
+    "schema_id": null,
+    "image_size": [
+      1920,
+      1440
+    ]
+  },
+  "components": {
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+      "schema_id": "rgb/uint8/v1",
+      "data_ref": "observation/rgb.mkv",
+      "axes": [
+        "T",
+        "height",
+        "width",
+        "RGB"
+      ],
+      "valid_ref": "observation/rgb_valid.pt",
+      "valid_axes": [
+        "T"
+      ],
+      "provenance": {
+        "kind": "format_conversion",
+        "method": "exact source JPEG remux or exact RGB round-trip re-encoding"
+      },
+      "source_locator": {
+        "file": "camera/frames.jsonl",
+        "field": "source_locator",
+        "records": "all frame_index rows"
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+        "profile": "mkv/mjpeg_copy/v1",
+        "codec": "mjpeg",
+        "pixel_format": "yuvj420p",
+        "encoded_size": [
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+          1440
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+        "storage_fps": 1,
+        "timebase_role": "index_only",
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+          "version": "18.1.0",
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+          "output": "rgb24",
+          "rotation": "none",
+          "color_interpretation": "libswscale source metadata/defaults; identical source/target decoder",
+          "source_color_space": "unknown"
+        },
+        "encoder_parameters": {
+          "name": "copy",
+          "stream_copy": true,
+          "ffmpeg_version": "ffmpeg version 6.1.1-3ubuntu5 Copyright (c) 2000-2023 the FFmpeg developers",
+          "crf": null,
+          "gop": null
+        }
+      }
+    },
+    "segment": {
+      "available": true,
+      "schema_id": "segment/uint16_labels/v1",
+      "data_ref": "annotation/segment/mask.mkv",
+      "axes": [
+        "T",
+        "height",
+        "width"
+      ],
+      "valid_ref": "annotation/segment/mask_valid.pt",
+      "valid_axes": [
+        "T"
+      ],
+      "provenance": {
+        "kind": "format_conversion",
+        "method": "source 0 background -> 9; 1..8 unchanged; exact uint16 round-trip"
+      },
+      "source_locator": {
+        "file": "camera/frames.jsonl",
+        "field": "mask_source_locator"
+      },
+      "storage": {
+        "profile": "mkv/uint16_ffv1/v1",
+        "codec": "ffv1",
+        "pixel_format": "gray16le",
+        "encoded_size": [
+          1920,
+          1440
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+        "storage_fps": 1,
+        "timebase_role": "index_only",
+        "source_lossy": false,
+        "decoder": {
+          "name": "PyAV",
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+          "output": "gray16le",
+          "rotation": "none",
+          "color_interpretation": "libswscale source metadata/defaults; identical source/target decoder",
+          "source_color_space": "unknown"
+        },
+        "encoder_parameters": {
+          "name": "ffv1",
+          "stream_copy": false,
+          "ffmpeg_version": "ffmpeg version 6.1.1-3ubuntu5 Copyright (c) 2000-2023 the FFmpeg developers",
+          "crf": null,
+          "gop": null
+        }
+      },
+      "segmentation_type": "semantic",
+      "mapping_ref": "annotation/segment/instances.jsonl",
+      "coverage": {
+        "kind": "partial",
+        "meaning": "hands and selected interacting object categories; background is source task background, not exhaustive object annotation"
+      },
+      "valid_policy": {
+        "rule": "paired source label exists, shape and integer categories verified; no additional official QA supplied",
+        "local_excluded_frame_indices": []
+      }
+    },
+    "depth": {
+      "available": false,
+      "reason": "not provided by selected source image release"
+    },
+    "mano": {
+      "available": false,
+      "reason": "not exported: model profile/flat-hand-mean/translation conversion not empirically verified"
+    },
+    "visibility": {
+      "available": false,
+      "reason": "no independent source visibility input; never inferred from valid"
+    },
+    "contact": {
+      "available": false,
+      "reason": "raw package lacks contact/; interaction-order categories are not per-entity contact labels"
+    },
+    "intrinsic": {
+      "available": false,
+      "reason": "source calibration absent"
+    },
+    "extrinsic": {
+      "available": false,
+      "reason": "source calibration absent"
+    },
+    "keypoints": {
+      "available": false,
+      "reason": "source keypoints absent"
+    },
+    "object": {
+      "available": false,
+      "reason": "semantic classes do not establish instance identity/mesh/pose"
+    }
+  },
+  "split_scheme": "EgoHOS-official-four-directories",
+  "split_source_locator": {
+    "file": "camera/frames.jsonl",
+    "field": "source_locator",
+    "records": "all frame_index rows"
+  }
+}

EgoHOS/shared-v1.0/data/test_indomain_1920x1440_000000/ego/observation/rgb.mkv

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EgoHOS/shared-v1.0/data/test_indomain_1920x1440_000000/ego/observation/rgb_valid.pt

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EgoHOS/shared-v1.0/data/test_indomain_1920x1440_000001/ego/annotation/segment/mask.mkv

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EgoHOS/shared-v1.0/data/test_indomain_1920x1440_000001/ego/annotation/segment/mask_valid.pt

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+        ]
+      }
+    ],
+    "failed_candidates": [],
+    "pixel_coverage": "ALL frames, count and order",
+    "random_access": "sequential decode from beginning"
+  },
+  "segment": {
+    "selected": "ffv1",
+    "candidates": [
+      {
+        "encoder": "ffv1",
+        "bytes": 3210364,
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+        ],
+        "decode_verify_seconds": 1.8366550789996836,
+        "command": [
+          "ffmpeg",
+          "-hide_banner",
+          "-loglevel",
+          "error",
+          "-y",
+          "-f",
+          "rawvideo",
+          "-pixel_format",
+          "gray16le",
+          "-video_size",
+          "1920x1440",
+          "-framerate",
+          "1",
+          "-i",
+          "pipe:0",
+          "-an",
+          "-c:v",
+          "ffv1",
+          "-level",
+          "3",
+          "-pix_fmt",
+          "gray16le",
+          "outputs/EgoHOS-full/shared-v1.0/data/test_indomain_1920x1440_000001/ego/annotation/segment/mask.ffv1.mkv"
+        ]
+      }
+    ],
+    "failed_candidates": [],
+    "pixel_coverage": "ALL frames, count and order",
+    "random_access": "sequential decode from beginning"
+  }
+}

EgoHOS/shared-v1.0/data/test_indomain_1920x1440_000001/ego/metainfo.json

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+{
+  "schema_version": "hand-warehouse/1.0",
+  "dataset_id": "EgoHOS",
+  "release_id": "shared-v1.0",
+  "sequence_id": "test_indomain_1920x1440_000001",
+  "camera_id": "ego",
+  "sample_type": "image",
+  "num_frames": 108,
+  "hand_slots": [
+    "left",
+    "right"
+  ],
+  "view_type": "ego",
+  "split": "test",
+  "sampling": {
+    "type": "independent",
+    "source_fps": null,
+    "frames_ref": "camera/frames.jsonl",
+    "strategy": "full",
+    "seed": 20260928,
+    "timestamps": "unknown; no timestamps inferred from filenames or MKV PTS"
+  },
+  "camera": {
+    "model": "unknown",
+    "schema_id": null,
+    "image_size": [
+      1920,
+      1440
+    ]
+  },
+  "components": {
+    "rgb": {
+      "available": true,
+      "schema_id": "rgb/uint8/v1",
+      "data_ref": "observation/rgb.mkv",
+      "axes": [
+        "T",
+        "height",
+        "width",
+        "RGB"
+      ],
+      "valid_ref": "observation/rgb_valid.pt",
+      "valid_axes": [
+        "T"
+      ],
+      "provenance": {
+        "kind": "format_conversion",
+        "method": "exact source JPEG remux or exact RGB round-trip re-encoding"
+      },
+      "source_locator": {
+        "file": "camera/frames.jsonl",
+        "field": "source_locator",
+        "records": "all frame_index rows"
+      },
+      "storage": {
+        "profile": "mkv/mjpeg_copy/v1",
+        "codec": "mjpeg",
+        "pixel_format": "yuvj420p",
+        "encoded_size": [
+          1920,
+          1440
+        ],
+        "storage_fps": 1,
+        "timebase_role": "index_only",
+        "source_lossy": true,
+        "decoder": {
+          "name": "PyAV",
+          "version": "18.1.0",
+          "libraries": {
+            "libavutil": [
+              60,
+              26,
+              102
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+            "libavcodec": [
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+              28,
+              102
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+            "libavformat": [
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+              12,
+              102
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+            "libavdevice": [
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+              3,
+              102
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+            "libavfilter": [
+              11,
+              14,
+              102
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+            "libswscale": [
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+              5,
+              102
+            ],
+            "libswresample": [
+              6,
+              3,
+              102
+            ]
+          },
+          "output": "rgb24",
+          "rotation": "none",
+          "color_interpretation": "libswscale source metadata/defaults; identical source/target decoder",
+          "source_color_space": "unknown"
+        },
+        "encoder_parameters": {
+          "name": "copy",
+          "stream_copy": true,
+          "ffmpeg_version": "ffmpeg version 6.1.1-3ubuntu5 Copyright (c) 2000-2023 the FFmpeg developers",
+          "crf": null,
+          "gop": null
+        }
+      }
+    },
+    "segment": {
+      "available": true,
+      "schema_id": "segment/uint16_labels/v1",
+      "data_ref": "annotation/segment/mask.mkv",
+      "axes": [
+        "T",
+        "height",
+        "width"
+      ],
+      "valid_ref": "annotation/segment/mask_valid.pt",
+      "valid_axes": [
+        "T"
+      ],
+      "provenance": {
+        "kind": "format_conversion",
+        "method": "source 0 background -> 9; 1..8 unchanged; exact uint16 round-trip"
+      },
+      "source_locator": {
+        "file": "camera/frames.jsonl",
+        "field": "mask_source_locator"
+      },
+      "storage": {
+        "profile": "mkv/uint16_ffv1/v1",
+        "codec": "ffv1",
+        "pixel_format": "gray16le",
+        "encoded_size": [
+          1920,
+          1440
+        ],
+        "storage_fps": 1,
+        "timebase_role": "index_only",
+        "source_lossy": false,
+        "decoder": {
+          "name": "PyAV",
+          "version": "18.1.0",
+          "libraries": {
+            "libavutil": [
+              60,
+              26,
+              102
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+            "libavcodec": [
+              62,
+              28,
+              102
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+            "libavformat": [
+              62,
+              12,
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+              3,
+              102
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+            "libavfilter": [
+              11,
+              14,
+              102
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+            "libswscale": [
+              9,
+              5,
+              102
+            ],
+            "libswresample": [
+              6,
+              3,
+              102
+            ]
+          },
+          "output": "gray16le",
+          "rotation": "none",
+          "color_interpretation": "libswscale source metadata/defaults; identical source/target decoder",
+          "source_color_space": "unknown"
+        },
+        "encoder_parameters": {
+          "name": "ffv1",
+          "stream_copy": false,
+          "ffmpeg_version": "ffmpeg version 6.1.1-3ubuntu5 Copyright (c) 2000-2023 the FFmpeg developers",
+          "crf": null,
+          "gop": null
+        }
+      },
+      "segmentation_type": "semantic",
+      "mapping_ref": "annotation/segment/instances.jsonl",
+      "coverage": {
+        "kind": "partial",
+        "meaning": "hands and selected interacting object categories; background is source task background, not exhaustive object annotation"
+      },
+      "valid_policy": {
+        "rule": "paired source label exists, shape and integer categories verified; no additional official QA supplied",
+        "local_excluded_frame_indices": []
+      }
+    },
+    "depth": {
+      "available": false,
+      "reason": "not provided by selected source image release"
+    },
+    "mano": {
+      "available": false,
+      "reason": "not exported: model profile/flat-hand-mean/translation conversion not empirically verified"
+    },
+    "visibility": {
+      "available": false,
+      "reason": "no independent source visibility input; never inferred from valid"
+    },
+    "contact": {
+      "available": false,
+      "reason": "raw package lacks contact/; interaction-order categories are not per-entity contact labels"
+    },
+    "intrinsic": {
+      "available": false,
+      "reason": "source calibration absent"
+    },
+    "extrinsic": {
+      "available": false,
+      "reason": "source calibration absent"
+    },
+    "keypoints": {
+      "available": false,
+      "reason": "source keypoints absent"
+    },
+    "object": {
+      "available": false,
+      "reason": "semantic classes do not establish instance identity/mesh/pose"
+    }
+  },
+  "split_scheme": "EgoHOS-official-four-directories",
+  "split_source_locator": {
+    "file": "camera/frames.jsonl",
+    "field": "source_locator",
+    "records": "all frame_index rows"
+  }
+}

EgoHOS/shared-v1.0/data/test_indomain_1920x1440_000001/ego/observation/rgb.mkv

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+size 32265828

EgoHOS/shared-v1.0/data/test_indomain_1920x1440_000001/ego/observation/rgb_valid.pt

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EgoHOS/shared-v1.0/data/test_indomain_2560x1440_000000/ego/annotation/segment/instances.jsonl

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