Blend Video Sequences With Crossfade Transition

# 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({
    "2": {
        "class_type": "FL_VideoCrossfade",
        "inputs": {
            "blend_mode": "normal",
            "crossfade_frames": 72,
            "images_a": [
                "3",
                0
            ],
            "images_b": [
                "4",
                0
            ],
            "target_height": [
                "5",
                4
            ],
            "target_width": [
                "5",
                3
            ]
        },
        "_meta": {
            "title": "FL Video Crossfade"
        }
    },
    "3": {
        "class_type": "VHS_LoadVideo",
        "inputs": {
            "custom_height": 0,
            "custom_width": 0,
            "force_rate": 0,
            "format": "AnimateDiff",
            "frame_load_cap": 0,
            "select_every_nth": 1,
            "skip_first_frames": 0,
            "video": "crossfade_clip_1.mp4"
        },
        "_meta": {
            "title": "Load Video (Upload) 🎥🅥🅗🅢"
        }
    },
    "4": {
        "class_type": "VHS_LoadVideo",
        "inputs": {
            "custom_height": 0,
            "custom_width": 0,
            "force_rate": 0,
            "format": "AnimateDiff",
            "frame_load_cap": 0,
            "select_every_nth": 1,
            "skip_first_frames": 0,
            "video": "crossfade_clip_2.mp4"
        },
        "_meta": {
            "title": "Load Video (Upload) 🎥🅥🅗🅢"
        }
    },
    "5": {
        "class_type": "VHS_VideoInfo",
        "inputs": {
            "video_info": [
                "3",
                3
            ]
        },
        "_meta": {
            "title": "Video Info 🎥🅥🅗🅢"
        }
    },
    "6": {
        "class_type": "VHS_VideoCombine",
        "inputs": {
            "crf": 13,
            "filename_prefix": "AnimateDiff",
            "format": "video/h264-mp4",
            "frame_rate": [
                "5",
                0
            ],
            "images": [
                "2",
                0
            ],
            "loop_count": 0,
            "pingpong": False,
            "pix_fmt": "yuv420p",
            "save_metadata": True,
            "save_output": True,
            "trim_to_audio": False
        },
        "_meta": {
            "title": "Video Combine 🎥🅥🅗🅢"
        }
    }
})

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