Use RunComfy's API to run runwayml/runway-aleph-2/video-to-video. For accepted inputs and outputs, see the model's schema.
curl --request POST \
--url https://model-api.runcomfy.net/v1/models/runwayml/runway-aleph-2/video-to-video \
--header "Content-Type: application/json" \
--header "Authorization: Bearer <token>" \
--data '{
"video_url": "https://playgrounds-storage-public.runcomfy.net/tools/7460/media-files/input.mp4",
"prompt": "Restyle as 2D anime with clean cel-shaded linework and warm evening colors; keep the musician, saxophone, and camera framing."
}'Set the YOUR_API_TOKEN environment variable with your API key (manage keys in your Profile) and include it on every request as a Bearer token via the Authorization header: Authorization: Bearer $YOUR_API_TOKEN.
Submit an asynchronous generation job and immediately receive a request_id plus URLs to check status, fetch results, and cancel.
curl --request POST \
--url https://model-api.runcomfy.net/v1/models/runwayml/runway-aleph-2/video-to-video \
--header "Content-Type: application/json" \
--header "Authorization: Bearer <token>" \
--data '{
"video_url": "https://playgrounds-storage-public.runcomfy.net/tools/7460/media-files/input.mp4",
"prompt": "Restyle as 2D anime with clean cel-shaded linework and warm evening colors; keep the musician, saxophone, and camera framing."
}'Fetch the current state for a request_id ("in_queue", "in_progress", "completed", or "cancelled").
curl --request GET \
--url https://model-api.runcomfy.net/v1/requests/{request_id}/status \
--header "Authorization: Bearer <token>"Retrieve the final outputs and metadata for the given request_id; if the job is not complete, the response returns the current state so you can continue polling.
curl --request GET \
--url https://model-api.runcomfy.net/v1/requests/{request_id}/result \
--header "Authorization: Bearer <token>"Cancel a queued job by request_id; in-progress jobs cannot be cancelled.
curl --request POST \
--url https://model-api.runcomfy.net/v1/requests/{request_id}/cancel \
--header "Authorization: Bearer <token>"Provide a publicly reachable HTTPS URL. Ensure the host allows server-side fetches (no login/cookies required) and isn't rate-limited or blocking bots. Recommended limits: images ≤ 50 MB (~4K), videos ≤ 100 MB (~2–5 min @ 720p). Prefer stable or pre-signed URLs for private assets.
{
"type": "object",
"title": "Input schema",
"required": [
"video_url",
"prompt"
],
"properties": {
"video_url": {
"title": "Video URL",
"description": "Source video to edit. Must be 2-30 seconds and under 16 MB. Output length follows this clip.",
"type": "string",
"default": "https://playgrounds-storage-public.runcomfy.net/tools/7460/media-files/input.mp4",
"validations": [
{
"validation_rule": "file_size_mb<",
"validation_value": 16,
"validation_error": "File size must be less than 16 MB."
}
]
},
"prompt": {
"title": "Prompt",
"description": "Natural-language instruction describing the edit. Keep under 1000 characters.",
"type": "string",
"default": "Restyle as 2D anime with clean cel-shaded linework and warm evening colors; keep the musician, saxophone, and camera framing."
},
"keyframes": {
"title": "Keyframes",
"description": "Optional guidance images, up to 5. Each item needs an image URL and a timestamp in seconds from the start of the source clip.",
"type": "array",
"maxItems": 5,
"minItems": 0,
"items": {
"image_url": {
"title": "Image URL",
"description": "Guidance image for this timestamp (HTTPS URL).",
"type": "string",
"format": "image_uri",
"default": ""
},
"seconds": {
"title": "Timestamp (s)",
"description": "Absolute timestamp in seconds from the start of the source video (0-30).",
"type": "number",
"format": "float_slider_with_range",
"minimum": 0,
"maximum": 30,
"default": 0
}
}
},
"target_aspect_ratio": {
"title": "Target Aspect Ratio",
"description": "Optional expand/outpaint ratio. Leave unset to keep the source frame.",
"type": "string",
"enum": [
"16:9",
"4:3",
"3:2",
"1:1",
"2:3",
"3:4",
"9:16",
"21:9"
]
},
"seed": {
"title": "Seed",
"description": "Optional seed for more repeatable retries. Leave unset for a random draw.",
"type": "integer",
"minimum": 0,
"maximum": 4294967295
}
}
}{
"output": {
"type": "object",
"properties": {
"image": {
"type": "string",
"format": "uri",
"description": "single image URL"
},
"video": {
"type": "string",
"format": "uri",
"description": "single video URL"
},
"images": {
"type": "array",
"description": "multiple image URLs",
"items": {
"type": "string",
"format": "uri"
}
},
"videos": {
"type": "array",
"description": "multiple video URLs",
"items": {
"type": "string",
"format": "uri"
}
}
}
}
}RunComfy is the premier ComfyUI platform, offering ComfyUI online environment and services, along with ComfyUI workflows featuring stunning visuals. RunComfy also provides AI Models, enabling artists to harness the latest AI tools to create incredible art.