Seedance 短视频生成工程：从分镜到发布的专业实践

import os, time, requests

API_BASE = os.environ["SEEDANCE_API_BASE"]
API_KEY = os.environ["SEEDANCE_API_KEY"]
HEADERS = {
    "Authorization": f"Bearer {API_KEY}",
    "Content-Type": "application/json",
}

def create_video(prompt, image_url=None, duration=5, ratio="9:16"):
    payload = {
        "model": "seedance",
        "prompt": prompt,
        "duration": duration,
        "ratio": ratio,
    }
    if image_url:
        payload["image_url"] = image_url

    r = requests.post(
        f"{API_BASE}/v1/video/tasks",
        json=payload,
        headers=HEADERS,
        timeout=60,
    )
    r.raise_for_status()
    return r.json()["task_id"]

def wait_video(task_id, interval=5, timeout=600):
    start = time.time()
    while time.time() - start < timeout:
        r = requests.get(
            f"{API_BASE}/v1/video/tasks/{task_id}",
            headers=HEADERS,
            timeout=30,
        )
        r.raise_for_status()
        data = r.json()
        if data["status"] == "succeeded":
            return data["video_url"]
        if data["status"] == "failed":
            raise RuntimeError(data.get("error", "generation failed"))
        time.sleep(interval)
    raise TimeoutError("polling timeout")

shots = [
    {"scene": "城市清晨", "camera": "推镜", "action": "主角跑步", "duration": 4},
    {"scene": "办公室", "camera": "中景", "action": "打开电脑", "duration": 4},
]

def build_prompt(shot):
    return (
        f"{shot['scene']}，{shot['camera']}，{shot['action']}，"
        "电影感，自然光，细节清晰，无文字水印"
    )

results = []
for shot in shots:
    task_id = create_video(build_prompt(shot), duration=shot["duration"])
    video_url = wait_video(task_id)
    results.append(video_url)
    print("done:", video_url)

ffmpeg -f concat -safe 0 -i list.txt -c copy output.mp4