{
  "source_video": "D:/\u8bfe/\u8bfe\u5802\u6559\u5b66\u89c6\u98918.mp4",
  "track": "Cylinder001 Material opacity Composite map2 Color1",
  "confirmed": [
    "Key15 RGB0; key30 RGB1; key70 RGB0",
    "After selecting Slow incoming at70, source initially has broad symmetric fade",
    "At2290-2318s teacher drags horizontal incoming tangent handles; color component curves temporarily separate",
    "At2320s final component curves overlap in a faster early fade with long low tail"
  ],
  "existing_project_difference": "Version05 inherits default Slow/Slow fade; manual handle lengths have not been applied",
  "pending": [
    "precise per-component tangent lengths",
    "native matching and save/reopen",
    "full updated animation"
  ],
  "final_curve_image": "/classroom/course-assets/course57-fade-handles/2320.jpg.webp"
}