Seedance 2.0 First-Last Frame API，穩定中轉

curl https://api.macloudai.com/v1/media/generate \
  -H "Authorization: Bearer $API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "kwvideo-v2", "prompt": "一隻貓在窗台上看雨，電影感鏡頭", "params": {"duration": "5", "resolution": "720p", "aspect_ratio": "16:9"}}'
# → {"data": {"task_id": "mt_…"}}

curl "https://api.macloudai.com/v1/media/status?task_id=mt_…" \
  -H "Authorization: Bearer $API_KEY"

import time, requests

BASE = "https://api.macloudai.com/v1"
H = {"Authorization": "Bearer sk-..."}

r = requests.post(f"{BASE}/media/generate", headers=H, json={
    "model": "kwvideo-v2",
    "prompt": "一隻貓在窗台上看雨，電影感鏡頭",
    "params": {"duration": "5", "resolution": "720p", "aspect_ratio": "16:9"},
}).json()
task = r["data"]["task_id"]

# 每 5～10 秒查一次，is_final 為 true 時結果在 result_url
while True:
    s = requests.get(f"{BASE}/media/status", headers=H, params={"task_id": task}).json()["data"]
    if s["is_final"]:
        print(s["state"], s.get("result_url"), s.get("error"))
        break
    time.sleep(8)

# 下單時先按價目凍結預估費用，出結果後按實際用量多退少補，失敗全退