Happy Horse 1.1 Image to Video
Animate a first-frame image into a 3-15 second video with native audio using Alibaba's Happy Horse 1.1. The video starts exactly from your image and keeps its aspect ratio, while an optional prompt directs the motion, style, and soundtrack at 480p, 720p, or 1080p.
32% less than the priciest provider (6 compared). Same model, same output.
First-frame image (JPEG/PNG/WebP, at least 300px per side). The video keeps its aspect ratio.
Duration
Length of the generated video in seconds (3-15). Billed per second.
Resolution
Output resolution. 1080p is the model's default; 480p is the budget rung.
32% less than the priciest provider (6 compared). Same model, same output.
Your result renders here.
Use Happy Horse 1.1 Image to Video via the API
Generate with Happy Horse 1.1 Image to Video from your own code. Async by design: submit a generation, get a run id back instantly, poll until it completes. Billed in credits at the best available provider price — from $0.07 per second, audio included.
1 — Start a generation
curl -X POST https://app.scenetra.com/api/v1/generate/happy-horse-1.1-i2v \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{"prompt":"Slow push-in, the subject turns to camera and smiles, soft wind in the hair","image":"https://example.com/first-frame.jpg","duration":"5"}'Response (202)
{
"runId": "run_abc123",
"status": "PENDING",
"model": "happy-horse-1.1-i2v",
"estimatedCredits": 639,
"statusUrl": "/api/v1/runs/run_abc123"
}2 — Poll until COMPLETED (every 2-5 seconds)
curl https://app.scenetra.com/api/v1/runs/run_abc123 \
-H "Authorization: Bearer YOUR_API_KEY"Response
{
"runId": "run_abc123",
"status": "COMPLETED",
"progress": { "completed": 1, "total": 1 },
"outputs": [
{ "type": "video", "url": "https://images.scenetra.com/..." }
],
"error": null,
"estimatedCredits": 639
}Request fields
| Field | Type | Description | Default |
|---|---|---|---|
| prompt | string | Optional prompt guiding the motion, style and audio of the animation. | — |
| image* | string (https URL) | First-frame image (JPEG/PNG/WebP, at least 300px per side). The video keeps its aspect ratio. | — |
| duration | string | Length of the generated video in seconds (3-15). Billed per second.3 · 4 · 5 · 6 · 7 · 8 · 9 · 10 · 11 · 12 · 13 · 14 · 15 | 5 |
| resolution | string | Output resolution. 1080p is the model's default; 480p is the budget rung.480p · 720p · 1080p | 1080p |
| callbackUrl | string (https URL) | Optional. When the run finishes (completed or failed), we POST the final run status to this URL — same shape as the poll response, plus model, params, and chargedCredits. Best-effort; polling remains the source of truth. | |
Unknown fields are rejected with a helpful 400. Media fields take https URLs. There is no provider parameter — every run is routed to the cheapest capable provider automatically.
Good to know
Billing
Runs bill your account credits at provider cost with 0% markup. The submit response includes the credit estimate; failed generations are refunded automatically. Add ?dryRun=1 to get the estimate without running anything.
Errors
Errors are always { "error": { "code", "message" } } with stable codes: unauthorized, model_not_available, invalid_parameter, insufficient_credits, rate_limited. A failed run is not an HTTP error — poll responses report status: "FAILED" with the reason.
What makes Happy Horse 1.1 Image to Video different
Native audio, directed by your prompt
Happy Horse 1.1 generates picture and sound together. Dialogue, background music, and sound effects come out of the same prompt as the visuals — write "she whispers 'follow me' over distant thunder" and the model stages both the shot and the soundtrack. There is no separate audio pass and no surcharge: the per-second rate covers everything.
Nine aspect ratios, 9:21 to 21:9
Most video models offer three or four ratios. Happy Horse 1.1 offers nine — 16:9, 9:16, 1:1, 4:3, 3:4, 4:5, 5:4, and the unusually tall 9:21 and ultrawide 21:9. That means native output for vertical stories, square feeds, classic TV framing, and anamorphic-style cinematics without cropping in post.
Any duration from 3 to 15 seconds
Pick any whole second from 3 to 15. Three-second clips are cheap motion tests — a 3-second 480p draft costs about $0.21 — while 15 seconds is enough for a full beat of action with dialogue. Billing is strictly per second, so an 11-second clip costs exactly 11 seconds, not a rounded-up preset.
Draft at 480p, ship at 1080p
480p costs $0.07 per second, 720p $0.099, and 1080p $0.128. A practical loop on a Scenetra board: iterate your prompt at 480p until the motion and audio land, then flip the resolution select to 1080p for the final render — same node, same wiring, billed at provider cost with 0% markup.
Parameters
| Parameter | Type | Description | Default |
|---|---|---|---|
| Prompt* | text | Describe the scene, action, camera, and style. Audio — dialogue, music, SFX — is generated natively and directed through this prompt. | — |
| Duration | select | Duration of the video in seconds, any whole second from 3 to 15.3 · 4 · 5 · 6 · 7 · 8 · 9 · 10 · 11 · 12 · 13 · 14 · 15 | 5 |
| Resolution | select | Output resolution. 1080p is the model's default; 480p is the budget rung.480p · 720p · 1080p | 1080p |
| Aspect Ratio | select | Aspect ratio of the generated video, from tall 9:21 to ultrawide 21:9.16:9 · 9:16 · 1:1 · 4:3 · 3:4 · 4:5 · 5:4 · 9:21 · 21:9 | 16:9 |
Pricing
From $0.07 per second, audio included
Pay per generation — only pay for what you use.
480p
$0.07/s
per second
720p
$0.099/s
per second
1080p
$0.128/s
per second
What a video costs
| Duration | 480p | 720p | 1080p |
|---|---|---|---|
| 5 seconds | $0.35 | $0.49 | $0.64 |
| 10 seconds | $0.70 | $0.99 | $1.28 |
Use cases
Social content
- Vertical 9:16 story clips
- Sound-on hooks with dialogue
- Square feed loops
- Trend-format skits
Film & storytelling
- Ultrawide 21:9 establishing shots
- Dialogue scenes with native audio
- Mood pieces with ambience
- 15-second narrative beats
Marketing & ads
- Product teasers with music
- Multi-ratio campaign variants
- Spoken-tagline bumpers
- Cheap 480p concept tests
Music & audio-led
- Music-driven visuals
- SFX-heavy action clips
- Ambient soundscape loops
- Rhythmic montage drafts
Frequently asked questions
How does Happy Horse 1.1 image-to-video work?+
You upload a first-frame image and the model generates a 3-15 second video that starts exactly from it, keeping the image's aspect ratio. An optional prompt guides the motion, style, and audio. On Scenetra: drop a Happy Horse 1.1 Image to Video node on your board, connect or upload the image, and generate — no API key needed.
Does the animated video include audio?+
Yes — Happy Horse 1.1 generates native audio with every clip: ambient sound, music, effects, and dialogue when your prompt calls for it. Audio is included in the per-second price rather than billed as an add-on.
What image formats and sizes does it accept?+
JPEG, PNG, or WEBP, at least 300px per side, up to 20MB. The output video keeps your image's aspect ratio, so frame the still the way you want the clip framed — there's no separate aspect-ratio setting in this mode.
Do I need to write a prompt to animate an image?+
No — the prompt is optional, and the model can infer natural motion from the image alone. Writing a short one gives better control though: describe the action ('steam rises from the cup'), the camera ('slow push in'), and the sound ('soft cafe chatter'). Describe motion, not the image — the model already sees your upload.
Related models
MiniMax H3
MiniMax H3 is the newest generation of the Hailuo video lineage: 5-15 second clips with native stereo audio — dialogue, music, and sound effects rendered in the same pass as the picture. Generate at 480P or 768P natively, or step up to 2K and 4K upscaled output, in six aspect ratios from cinematic 21:9 to vertical 9:16.
View model →Seedance 2.5
ByteDance's Seedance 2.5 generates cinematic videos up to 30 seconds from text prompts with synchronized audio — voice, sound effects, and background music — built in by default. The newest Seedance generation, with mp4 or high-fidelity mov output for multi-round editing pipelines.
View model →PixVerse v6
PixVerse's flagship video model generates 1-15 second clips from a text prompt with optional synchronized audio, multi-shot sequences, four resolutions from 360p to 1080p, and eight aspect ratios from vertical 9:16 to cinematic 21:9. Starting at $0.02 per second, it is one of the most affordable ways to produce finished AI video.
View model →Kling 3.0 Pro
Kuaishou's flagship video generation model delivering stunning visual fidelity. Kling 3.0 Pro supports text-to-video, image-to-video with start/end frames, element references for character consistency, and native audio generation.
View model →Start creating with Happy Horse 1.1 Image to Video
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