AI 视频连续性维护：跨片段的状态账本方法

完整序列：
骑手下降通过雾气，在掉落的树枝前刹车，扛着自行车绕过它，重新上车，并继续朝向阳光明媚的开口。

片段 1：
下降和刹车。以自行车停在道路右侧、前轮略微向左转、骑手右脚着地结尾。

片段 2：
骑手下车，扛起自行车绕过树枝，重新上车，向阳光开口骑去。

{
  "character": {
    "identity": "同一个成人骑手",
    "wardrobe": "哑光黑色头盔、蓝色雨夹克、黑色裤子",
    "fixed_details": "红色背包、无手套"
  },
  "vehicle": {
    "type": "黑色硬尾山地车",
    "fixed_details": "下管笼中有饮水瓶、无后悬挂"
  },
  "world": {
    "location": "通过松林的潮湿山地道路",
    "weather": "轻雾、无活跃降雨",
    "light": "来自左上方的柔和晨间逆光"
  },
  "camera_language": {
    "height": "低腰部高度跟踪",
    "lens": "中等广角外观",
    "movement": "光滑，有微小自然振动",
    "screen_direction": "左到右"
  },
  "audio": {
    "bed": "轮胎噪音、轻风、远处鸟鸣",
    "music": "无"
  }
}

{
  "clip_id": "01-descent-and-stop",
  "inherits": {
    "rider_position": "left third",
    "direction": "left to right",
    "speed": "moderate downhill",
    "hands": "both on handlebars",
    "bike": "upright and rolling"
  },
  "changes": [
    "fallen branch becomes visible",
    "rider brakes without reversing",
    "bike moves to right side of road",
    "right foot lowers to ground"
  ],
  "end_state": {
    "rider_position": "right third",
    "direction": "still facing right",
    "speed": "stopped",
    "right_foot": "on ground",
    "left_foot": "on pedal",
    "front_wheel": "turned slightly left",
    "hands": "both on handlebars",
    "branch": "two meters ahead",
    "camera": "stable low three-quarter view",
    "hold": "one second"
  }
}

同一个骑手穿着哑光黑色头盔、蓝色雨夹克、黑色裤子和红色背包，骑着黑色硬尾山地车从左到右在潮湿的森林道路上行进。低腰部高度跟踪摄像机，来自左上方的柔和早晨逆光。

骑手看到一根掉落的树枝，逐渐刹车而不反向，移向道路右侧并停止。右脚降低到地面，同时左脚留在踏板上。双手留在把手上。前轮略微指向左侧。以稳定的低三分之一视图结尾，树枝两米远处。持握确切的最终状态一秒钟。无切口、服装变化、额外骑手或方向反向。

curl https://reapi.ai/api/v1/videos/generations \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "doubao-seedance-2.5-face",
    "prompt": "The cyclist rides left to right, brakes before a fallen branch, and stops on the right side of the road. Right foot on ground, left foot on pedal, both hands on handlebars, front wheel slightly left. Hold the exact final state for one second. Preserve rider, bicycle, wardrobe, road, light, and direction.",
    "image_urls": ["https://example.com/rider-and-bike-reference.jpg"],
    "resolution": "720p",
    "size": "16:9",
    "duration": 12,
    "generate_audio": true,
    "return_last_frame": true
  }'

{
  "identity": "pass",
  "screen_direction": "pass",
  "right_foot_grounded": "pass",
  "left_foot_on_pedal": "repair",
  "both_hands_on_handlebars": "pass",
  "front_wheel_direction": "pass",
  "branch_distance": "pass",
  "stable_hold": "pass"
}

从 Image 1 开始。同一个骑手停在潮湿道路的右侧，面向右。右脚在地上，左脚在踏板上，双手握住把手，前轮略微指向左侧，掉落的树枝在两米远处。保持相同的骑手、头盔、蓝色夹克、红色背包、黑色自行车、饮水瓶、雾气和光线方向。

骑手向左侧下车，不转向自行车，用车架提起自行车，走过树枝的近端，将两个轮子放回面向右的道路，重新上车，朝亮处开口骑去。保持左到右屏幕方向。以骑手从右离开画面结尾。无新道具、服装变化、天气变化或切口。

curl https://reapi.ai/api/v1/videos/generations \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "doubao-seedance-2.5-face",
    "prompt": "Begin exactly from Image 1. Preserve rider, wardrobe, bicycle, prop placement, fog, light, and left-to-right direction. The rider dismounts, carries the bicycle around the branch without reversing it, remounts, and exits frame right. No cuts or new objects.",
    "image_with_roles": [
      {
        "url": "LAST_FRAME_URL_FROM_CLIP_1",
        "role": "first_frame"
      }
    ],
    "resolution": "720p",
    "size": "adaptive",
    "duration": 14,
    "generate_audio": true,
    "return_last_frame": true
  }'

{
  "visual_match": "pass",
  "screen_direction": "pass",
  "action_continuation": "repair",
  "camera_velocity": "pass",
  "audio_bed": "repair in edit",
  "note": "clip 2 lifts the left foot before the hands shift to the frame"
}

/sequence
  master-continuity.json
  clip-01-ledger.json
  clip-02-ledger.json
  clip-03-ledger.json
  /references
  /boundary-frames
  /generated
  /approved

clip-02.end_state == clip-03.inherits