Vidu Q2: FLF2V

# Python 3.10+: pip install comfy-sdk==0.4.0
import os

from comfy_sdk import Comfy

api_key = os.environ.get("COMFY_API_KEY", "").strip()
if not api_key: raise RuntimeError("Set COMFY_API_KEY")
os.environ.setdefault("COMFY_BASE_URL", "https://cloud.comfy.org")
client = Comfy(api_key=api_key)
workflow = client.workflows.from_json({
    "37": {
        "class_type": "SaveVideo",
        "inputs": {
            "filename_prefix": "video/vidu_q2_flf2v",
            "format": "auto",
            "format.codec": "auto",
            "video": [
                "43",
                0
            ]
        },
        "_meta": {
            "title": "Save Video"
        }
    },
    "40": {
        "class_type": "LoadImage",
        "inputs": {
            "image": "nun_in_church-1.png"
        },
        "_meta": {
            "title": "Load Image"
        }
    },
    "42": {
        "class_type": "LoadImage",
        "inputs": {
            "image": "nun_in_church-2.png"
        },
        "_meta": {
            "title": "Load Image"
        }
    },
    "43": {
        "class_type": "Vidu2StartEndToVideoNode",
        "inputs": {
            "duration": 5,
            "end_frame": [
                "42",
                0
            ],
            "first_frame": [
                "40",
                0
            ],
            "model": "viduq2-pro-fast",
            "movement_amplitude": "small",
            "prompt": "A cinematic sequence opens with an extreme close-up of a young nun's serene face, her eyes gazing upward with contemplative expression, soft ethereal light illuminating her delicate features. The camera slowly pulls back, revealing her full habit and wimple, then continues to dolly out as she begins to walk forward with measured, graceful steps. The ornate cathedral interior with golden Baroque details gradually transitions, the warm church lighting morphing into the cool, ancient stone architecture of a vast underground corridor. As the camera continues its pull-back, the nun walks deeper into the frame, now seen from behind in her dark flowing robe, moving along a sandy path flanked by massive weathered stone pillars. The shot transforms from intimate close-up to a wide establishing shot, revealing the full scale of the ancient ruins with receding arches disappearing into atmospheric haze. The camera movement is smooth and deliberate, maintaining the nun as the focal point while the environment dramatically shifts from sacred interior to mysterious underground passage. Warm golden light from the church gradually gives way to the dramatic side-lighting of the ancient corridor, creating a seamless yet visually striking transition between the two distinct spaces.",
            "resolution": "720p",
            "seed": 378524676
        },
        "_meta": {
            "title": "Vidu2 Start/End Frame-to-Video Generation"
        }
    }
})

# run() also passes api_key to the partner nodes in this workflow.
job = client.run(workflow, api_key=api_key)