Video Generation API Errors: Rejected Submissions, Failed Tasks and Moderation, Explained (2026)

// Seedance
{"model": "seedance-2.5", "content": [{"type": "text", "text": "A harbour at dawn, slow push-in"}], "resolution": "720p", "duration": 5}

// Kling
{"model": "kling-v3", "prompt": "Rainy street at night, neon reflections", "mode": "std", "duration": 5, "sound": "off"}

// Hailuo 2.3 Fast (image to video)
{"model": "hailuo-2.3-fast", "prompt": "Slow push-in", "first_frame_image": "https://…/frame.png", "resolution": "768P", "duration": 6}

import time, requests

BASE = "https://cocodot.co/api/ai/video/generations"
H = {"Authorization": "Bearer cocodot-..."}

def submit(body, tries=4):
    for i in range(tries):
        r = requests.post(BASE, json=body, headers=H, timeout=90)
        if r.ok:
            return r.json()["id"]
        if r.status_code in (429, 503):
            time.sleep(5 * 2 ** i)
            continue
        raise RuntimeError(f"{r.status_code} {r.text}")  # fix the request; do not retry
    raise RuntimeError("repeated 429/503; try again later")

def run(body, max_regen=1):
    for attempt in range(max_regen + 1):
        tid = submit(body)
        while True:
            time.sleep(15)
            t = requests.get(f"{BASE}/{tid}", headers=H, timeout=30).json()
            if t["status"] == "SUCCEEDED":
                return t["videoUrl"]  # download and store it promptly
            if t["status"] == "FAILED":
                break
        err = t.get("error") or ""
        print("task", tid, "failed:", err)
        if err != "视频生成失败,本次未扣费,请稍后重试。":
            raise RuntimeError(err)  # review unknown or moderation errors
    raise RuntimeError("generation keeps failing: review parameters and content")