Question 1

What is Happy Horse Reference-to-Video?

Accepted Answer

Happy Horse Reference-to-Video composes multi-subject 1080p video scenes from 1-9 reference images plus a text prompt. Each reference is addressable as `character1`, `character2`, … in the prompt, so you can stage interactions, multi-product shots, or brand-consistent scenes with stable identity across the whole clip.

Question 2

How much does Happy Horse Reference-to-Video cost on Runflow?

Accepted Answer

$0.14 per second of output at 720p, and $0.28 per second at 1080p. The number of reference images doesn't change the price — same flat per-second rate from 1 to 9 references.

Question 3

How do I reference my images in the prompt?

Accepted Answer

List your images in `image_urls` (1-9 entries). In the prompt, refer to them as `character1`, `character2`, …, in the same order. Example: with two images, prompt `A dance battle between character1 and character2, neon city background, cinematic camera`.

Question 4

What reference image quality is required?

Accepted Answer

JPEG, JPG, PNG, or WEBP up to 10MB each. Shortest side must be at least 400 pixels — 720p or higher is recommended for clean identity preservation. Cluttered or low-resolution refs reduce subject consistency.

Question 5

Can I use Happy Horse output commercially?

Accepted Answer

Yes — all output via Runflow is licensed for commercial use, including ads and products with branded subjects.

Question 6

Do I need to manage GPUs or infrastructure?

Accepted Answer

No. Runflow handles GPU provisioning, queueing, multi-region routing, and scaling. One HTTP call returns a video URL.

Parameter	Type	Required	Description
prompt	string	required	Text prompt describing the desired video. Reference subjects from your images using ``character1``, ``character2``, ... up to ``character9`` (the order matches the order of ``image_urls``). Max 2500 characters.
image_urls	image_list	required	Reference images for subject consistency (1-9 images). Formats: JPEG, JPG, PNG, WEBP. Shortest side must be at least 400 px (720P or higher recommended). Max 10 MB each.
aspect_ratio	string	optional	Aspect ratio of the generated video.
duration	integer	optional	Output video duration in seconds (3-15).
enable_safety_checker	boolean	optional	Enable content moderation for input and output.
resolution	string	optional	Output video resolution tier.
seed	integer	optional	Random seed for reproducibility (0-2147483647).

Field	Type	Description
outputs	json	Unified output array — one entry per generated artifact with url/type/width/height/duration/etc.
seed	json	Deterministic seed used for generation, or null if the provider doesn't return one.
timing	json	Provider timing info (inference_ms etc.), or null.
nsfw_detected	json	true if the provider flagged output as NSFW, false if cleared, null if not checked.

alibaba/happy-horse/reference-to-video

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