WAN2.6: Reference to Video

# 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({
    "33": {
        "class_type": "WanReferenceVideoApi",
        "inputs": {
            "duration": 5,
            "model": "wan2.6-r2v",
            "negative_prompt": "",
            "prompt": "Shot 1: Extreme close-up of Character 1’s determined face, hands tightly gripping a spear, rain cascading down polished armor. Character 1 speaks in fluent English with a gravelly voice: \"I will not yield!\" Heavy, labored breathing; raindrops striking metal with sharp, clinking sounds. Hyper-detailed, gritty texture.\n\nShot 2: Close-up of Character 2’s piercing, intense gaze, streaks of blood smudged across the face, weapon held in a battle-ready stance. Character 2 responds in clear English with a cold tone: \"Then this ends now.\" Thunder rumbles in the background, raindrops splashing violently against the ground. High contrast, dramatic lighting.\n\nShot 3: Epic wide shot: Two characters stand 20 meters apart, weapons raised, thick smoke swirling between them under roiling storm clouds. Eyes locked in a death stare, tension palpable. Wind howls fiercely, distant battle cries echo. All environmental sounds and dialogue must be in English. Cinematic, epic confrontation scene, film-grade composition.",
            "reference_videos.character1": [
                "34",
                0
            ],
            "reference_videos.character2": [
                "35",
                0
            ],
            "seed": 1354927741,
            "shot_type": "multi",
            "size": "720p: 16:9 (1280x720)",
            "watermark": False
        },
        "_meta": {
            "title": "Wan Reference to Video"
        }
    },
    "34": {
        "class_type": "LoadVideo",
        "inputs": {
            "file": "armored_warrior.mp4"
        },
        "_meta": {
            "title": "Load Video"
        }
    },
    "35": {
        "class_type": "LoadVideo",
        "inputs": {
            "file": "spear_warrior.mp4"
        },
        "_meta": {
            "title": "Load Video"
        }
    },
    "37": {
        "class_type": "SaveVideo",
        "inputs": {
            "filename_prefix": "video/wan2_6_r2v",
            "format": "auto",
            "format.codec": "auto",
            "video": [
                "33",
                0
            ]
        },
        "_meta": {
            "title": "Save Video"
        }
    }
})

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