HappyHorse 1.1 Video Edit: AI Video Editor

Happy Horse 1.1 Video Edit modifies an existing video using a natural-language instruction, with selectable 720p/1080p output resolution. Happy Horse 1.1 Video Edit — modify an input video using natural-language instructions with optional reference images. Selectable output resolution (720p/1080p) — price scales with the resolution chosen.

Interactive model controls

Happy Horse 1.1 Video Edit — modify an input video using natural-language instructions with optional reference images. Selectable output resolution (720p/1080p) — price scales with the resolution chosen.

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Overview

About this model

Updated Sep 11, 2026

Happy Horse 1.1 Video Edit modifies an existing video using a natural-language instruction, with optional reference images to guide the edit, at your choice of 720p or 1080p output resolution. Note: Happy Horse 1.1 has no dedicated video-edit model of its own — requests are submitted directly via the Happy Horse 1.0 video-edit path (same webhook), so pricing matches Happy Horse 1.0's video-edit rates rather than 1.1's cheaper text/image/reference rates.

A single resolution parameter lets you draft cheaply at 720p and switch to 1080p for final output on the same endpoint.

1Subject replacement: swap a person, animal, or object in an existing video for something else

2Environment restyling: change the setting/background of a video while preserving action and camera motion

3Style transfer edits: apply an artistic or thematic restyle to existing footage

4Asset localization: swap in branded assets/products into existing video content

5Creative remixing: reimagine existing footage with new visual elements guided by reference images

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Pricing & Value

Cost analysis

Provider	Cost	Notes
muapiapp	$0.21–$0.42/sec of input video (720p–1080p)	Simple per-second, resolution-scaled pricing with no subscriptions. Pick 720p for cost-effective drafts or 1080p for premium output, on the same endpoint.

muapiapp$0.21–$0.42/sec of input video (720p–1080p)

Simple per-second, resolution-scaled pricing with no subscriptions. Pick 720p for cost-effective drafts or 1080p for premium output, on the same endpoint.

** Competitor pricing is estimated based on similar model architectures and usage tiers.

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Technical Details

Configuration schema

Parameter	Type	Description	Default
Prompt	string	Edit instruction describing the change to apply to the video.	`Replace the horse with @image1 and replace the shopping cart with @image2 while preserving the original high-speed motion and camera movement.`
Resolution	Enum (2 options)	Output resolution. Price scales with resolution: 720p is cheaper, 1080p is more expensive.	`720p`
Video URL	string	Source video URL. MP4/MOV (H.264 recommended), 3-60s, <=100 MB, longer side <=2160px, shorter >=320px, frame rate >8 fps.	`https://d3adwkbyhxyrtq.cloudfront.net/webassets/videomodels/happy-horse-1-reference-to-video-720p.mp4`
Reference Images	array	Optional 0-5 reference image URLs to guide the edit.	`https://d3adwkbyhxyrtq.cloudfront.net/webassets/videomodels/happy-horse-1-video-edit-1080p-1.jpg`
Audio Setting	Enum (2 options)	Audio strategy: 'auto' lets the model decide, 'origin' preserves source audio.	`auto`
Seed	int	Optional random seed for reproducibility (0-2147483647).	`0`

Promptstring

Edit instruction describing the change to apply to the video.

Default Value

Replace the horse with @image1 and replace the shopping cart with @image2 while preserving the original high-speed motion and camera movement.

ResolutionEnum (2 options)

Output resolution. Price scales with resolution: 720p is cheaper, 1080p is more expensive.

Default Value720p

Video URLstring

Source video URL. MP4/MOV (H.264 recommended), 3-60s, <=100 MB, longer side <=2160px, shorter >=320px, frame rate >8 fps.

Default Valuehttps://d3adwkbyhxyrtq.cloudfront.net/webassets/videomodels/happy-horse-1-reference-to-video-720p.mp4

Reference Imagesarray

Optional 0-5 reference image URLs to guide the edit.

Default Valuehttps://d3adwkbyhxyrtq.cloudfront.net/webassets/videomodels/happy-horse-1-video-edit-1080p-1.jpg

Audio SettingEnum (2 options)

Audio strategy: 'auto' lets the model decide, 'origin' preserves source audio.

Default Valueauto

Seedint

Optional random seed for reproducibility (0-2147483647).

Default Value0

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Implementation Guide

Developer documentation

Provide the source video_url (MP4/MOV, 3-60s, ≤100MB, longer side ≤2160px, shorter side ≥320px, >8fps).
Write a prompt describing the edit instruction.
Optionally add 0-5 reference images in images_list to guide the edit.
Set resolution to "720p" (cheaper, default) or "1080p" (premium output).
Choose audio_setting ("auto" or "origin") and an optional seed.
Submit your request—the model applies the edit at the selected resolution.

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Common Questions

Frequently asked

What is the cost of Happy Horse 1.1 Video Edit?

Happy Horse 1.1 Video Edit costs $0.21/sec of input video at 720p (default) or $0.42/sec at 1080p on muapi — the same rate as Happy Horse 1.0's video-edit, since 1.1 routes video-edit requests through the same underlying model.

How do I choose the resolution?

Pass `resolution: "720p"` (default) or `resolution: "1080p"` in your request body — both are served by the same endpoint.

What video formats are supported?

MP4 or MOV (H.264 recommended), 3-60 seconds, up to 100MB, longer side up to 2160px, shorter side at least 320px, frame rate above 8fps.

What does audio_setting control?

"auto" lets the model decide how to handle audio for the edit; "origin" preserves the source video's original audio track.

What happened to the dedicated 720p/1080p endpoints?

They still work exactly as before, unchanged, for existing integrations. This unified endpoint is the new recommended way to access both resolutions through one integration.