HappyHorse 1.0 Video Edit API: AI Video Editing

What is HappyHorse 1.0 Video Edit?

HappyHorse 1.0 Video Edit is Alibaba's video-to-video editing model: you send a video you already have, describe the change in plain words, and get the same video back with that change applied. It handles two kinds of jobs. A style change repaints the whole scene (watercolor, anime, a new color grade) while keeping the motion and camera path. A local edit swaps one thing (an outfit, a prop, a sky) and leaves everything else alone.

It runs on its own model ID, alibaba/happyhorse-1.0-video-edit, separate from the HappyHorse 1.0 API and HappyHorse 1.1 API generation models. The source can be any MP4 or MOV, so videos from other models, phone recordings, and stock video all work.

Key features of HappyHorse 1.0 Video Edit

Local edits from a reference image

Attach a photo of the object you want and say where it goes. The model swaps that one item and keeps the face, lighting, background, and camera move from the source video.

Whole-scene style changes

A prompt alone can restyle every frame. Motion, timing, and framing carry over, so the edited video still cuts against the original edit.

Up to 5 reference images

More than Wan 2.7 Video Edit or Kling O1 Edit take (4 each). Use the extra slots for a product shot from several angles or a small moodboard.

Original audio on request

Set audio_setting to origin and the source soundtrack passes through untouched. Dialogue and voiceover stay in sync with the new picture.

Output length follows the source

There is no duration setting. A 6-second source returns a 6-second edit, and sources longer than 15 seconds return their first 15 seconds.

What HappyHorse 1.0 Video Edit is best for

Wardrobe and product swaps
Put a new jacket, bottle, or phone into a shot you already approved, using a product photo as the reference.
Client revisions without a reshoot
A late note like "make the cup a wine glass" or "sunset sky" becomes one edit call instead of a new render.
Style variants for social
Turn one brand video into watercolor, anime, or film-grain cuts for different channels.
Fixing generated videos
Correct one wrong detail in a HappyHorse 1.1 or Veo output instead of rolling the whole prompt again.
Restyles that keep the voiceover
Change the picture while audio_setting: origin keeps narration and dialogue as recorded.

HappyHorse 1.0 Video Edit use cases

An ecommerce team films one model walking toward camera, then runs that video through the edit endpoint once per colorway, passing each product photo as the reference image. A short-drama studio fixes continuity errors (a missing prop, the wrong shirt) in shots that are otherwise done. An ad agency cuts a 15-second spot into three looks for a regional test while keeping the voiceover. A generation pipeline renders with HappyHorse 1.1, checks the result, and sends only the bad shots to Video Edit with a short correction prompt and a fixed seed.

HappyHorse 1.0 Video Edit limitations

Only the first 15 seconds of a source get edited, so split longer videos into 15-second parts and edit each one. The source must be 3 to 60 seconds, MP4 or MOV, and at most 100 MB, and the result keeps the source's framing because there is no aspect ratio setting. Output is 720p or 1080p. Prompts cap at 5,000 non-Chinese or 2,500 Chinese characters, and anything past that is cut off.

HappyHorse 1.0 Video Edit vs Kling O1 Edit

On the Arena video-edit leaderboard (updated August 26, 2026) HappyHorse 1.0 sits at #6 with 1307 Elo from 3,116 votes. Kling O1 Pro sits at #9 with 1197, a 110-point gap built on more than 10,000 votes. HappyHorse also ranks above Grok Imagine Video (1258) and Kling O3 Pro (1255). Wan 3.0, Seedance 2.5, MiniMax H3, Gemini Omni Flash, and Seedance 2.0 hold the top five.

The Kling O1 Edit API still has controls HappyHorse lacks: a reference or transform mode and a choice of 1:1, 9:16, or 16:9 output. Pick Kling when you need to reframe. Pick HappyHorse for higher-rated edits, one more reference slot, and output that keeps the source framing.

When to use HappyHorse 1.0 Video Edit

Use it when the video already exists and most of it is right. For a new shot, generate with HappyHorse 1.1, which adds native audio and lip-sync. For an edit that needs a set output length, the Wan 2.7 Video Edit API has a duration setting (2 to 10 seconds). For local swaps driven by a product photo, HappyHorse is the one to test first.

What HappyHorse 1.0 Video Edit can do

Swap an outfit from one reference photo

One sweater photo and one sentence replace the jacket and shirt across the whole video. The stripes hold their pattern as the character moves, and the background, lighting, and table reflection stay as they were.

Before, reference, after

The source frame, the reference photo, and the edited frame side by side. Only the clothing changed, which is what a local edit should do.

Restyle the whole scene with a prompt

No reference image, one prompt. Every frame becomes watercolor on paper, while the head turn, studio lights, and camera move match the source frame for frame.

HappyHorse 1.0 Video Edit API examples

Call HappyHorse 1.0 Video Edit from any language by POSTing to /v1/tasks. Full parameter docs live at docs.unifically.com/models/video/alibaba/happyhorse-1.0-video-edit.

curl -X POST https://api.unifically.com/v1/tasks \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "alibaba/happyhorse-1.0-video-edit",
    "input": {
      "prompt": "Apply the visual style from the reference image to the entire video",
      "video_url": "https://example.com/clip.mp4",
      "reference_image_urls": ["https://example.com/style.png"],
      "audio_setting": "origin"
    }
  }'

Successful submission returns a task_id. Poll GET /v1/tasks/<task_id> or set a callback_url on the request to receive the finished video URL.

Perguntas frequentes

Perguntas frequentes sobre HappyHorse 1.0 Video Edit

It is Alibaba's HappyHorse 1.0 video editing model, called as alibaba/happyhorse-1.0-video-edit on UnificAlly. You send one source video, a text instruction, and up to 5 optional reference images. It returns the same video with the change applied, either a new style for the whole scene or a replaced object, outfit, or background.

No. HappyHorse 1.1 generates new videos from text, a first frame, or reference images, but it has no edit model. To change an existing video, including one made with HappyHorse 1.1, send it to alibaba/happyhorse-1.0-video-edit.

The source video must be 3 to 60 seconds long, in MP4 or MOV, up to 100 MB. Only the first 15 seconds are edited. A source of 15 seconds or less comes back at the same length, and anything longer comes back as its first 15 seconds.

Per second of edited output: $0.098/sec at 720p and $0.168/sec at 1080p. Output length follows the source up to 15 seconds, so a 10-second source at 720p costs $0.98. Failed tasks are not charged.

New UnificAlly accounts get a $0.50 signup balance, enough for about 5 seconds of edited video at 720p. That covers one short test edit in the playground or through the API. After that, billing is pay-per-use with no subscription.

They show the model what to bring into the video. One image of a sweater plus "make the character wear the striped sweater from the image" swaps the outfit while the face, background, and camera move stay put. Several moodboard stills steer a style change. You can attach up to 5, each up to 20 MB.

Yes. Set audio_setting to origin and the source soundtrack passes through untouched, which keeps dialogue and voiceover in sync with the edited picture. The default, auto, lets the model decide how to handle sound.

#6, with 1307 Elo from 3,116 votes on the Arena video-edit board as of its August 26, 2026 update. The ranking comes from blind side-by-side votes on real editing tasks, so it reflects which edits people preferred, not a lab benchmark.

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API do HappyHorse 1.0 Video Edit