{
  "video": "4_2.mp4",
  "task": "4_2",
  "instruction_index": 2,
  "total_instructions_for_video": 2,
  "instruction": {
    "category_label": "joint",
    "category": "J4",
    "operation": "J4.1 Identity Swap",
    "prompt_en": "Replace the cat with a dog.",
    "audio_label": {
      "audio_op": "replace",
      "sound_type": "animal",
      "edit_aspect": "identity"
    },
    "difficulty": {
      "d1_object_localization": "hard",
      "d1_reason": "The instruction requires locating and isolating the cat for replacement, which is not a global operation nor an extreme close-up filling most of the frame.",
      "d2_audio_complexity": "simple",
      "d3_cross_modal_linkage": "implicit_av",
      "d3_reason": "The instruction describes a visual replacement of a cat with a dog, which implicitly requires replacing the cat's vocalizations with dog sounds for realism, although the audio change is not explicitly mentioned in the prompt."
    }
  }
}