Happy Horse
The #1 open-source AI video generator. A 15B-parameter unified Transformer that jointly produces cinematic 1080p video with synchronized audio, multilingual lip-sync, and multi-shot storytelling — all in a single pass.
🐴 Open-Source · 15B Parameters · Joint Video-Audio Generation
✨AI Video Generator Pro✨
See Happy Horse in Action
Explore real-world examples showcasing the power of multimodal AI video generation. Each demo demonstrates how to combine images, videos, and prompts to create stunning results.
Creative Templates & Complex Effects
Precisely replicate fish-eye lens effects, flash overlays, and outfit changes. Reference a model's appearance across multiple clothing styles with dynamic camera cuts.
“Reference the model's facial features from the first image. The model wears outfits from reference images 2-6, approaching the camera with playful, cool, cute, surprised, and stylish poses. Each outfit change triggers a camera cut, using the fish-eye lens effect and flash overlay from the reference video.”
Motion & Camera Replication
Combine character actions from one video with camera movements from another. Create epic fight scenes under starry skies with dust effects and cinematic tension.
“Reference the character actions from video 1 and the orbiting camera movement from video 2. Generate a fight scene between character 1 and character 2 under a starry night sky, with white dust rising during combat. The fight should be spectacular and intensely atmospheric.”
Video Extension
Seamlessly extend videos while maintaining consistency. Create wild advertisement scenarios with a donkey riding a motorcycle through various cinematic shots.
“Extend the 15s video, referencing @image1 and @image2 of a donkey riding a motorcycle. Scene 1: Side shot of donkey bursting through a fence, startling chickens. Scene 2: Donkey doing motorcycle tricks in sand, close-up of tire then aerial shot. Scene 3: Mountain backdrop, donkey jumps with 'Inspire Creativity, Enrich Life' text reveal through masking effect.”
Cinematic Audio & Visuals
Generate MV-quality content with precise cinematography keywords. Create cinematic compositions with golden hour lighting and film grain aesthetics.
“Generate a 15-second MV video. Keywords: stable composition, gentle push-pull, low-angle hero shot, documentary but premium. Ultra-wide establishing shot, low angle slight upward tilt, cliff dirt road with vintage travel car in lower third, distant sea and horizon for depth, sunset side-backlight with volumetric rays through dust particles, cinematic framing, authentic film grain, wind gently moving clothes.”
Video Editing & Character Swap
Replace characters in existing videos while preserving all actions and movements. Swap a female vocalist with a male singer while keeping the band performance intact.
“Replace the female lead singer in video 1 with the male singer from image 1. Actions should completely match the original video. No camera cuts. The band continues performing.”
One-Take Long Shots
Create seamless one-take sequences using multiple reference images. Follow a runner through streets, stairs, corridors, and rooftops in a single continuous shot.
“@image1 @image2 @image3 @image4 @image5, one-take tracking shot, following a runner from street level up stairs, through corridor, onto rooftop, ending with city overlook.”
Creative Plot Completion
Let the AI create emotional narratives from minimal input. Provide images and audio as inspiration, and watch coherent mood-driven stories emerge.
“Using the audio from video 1, create an emotional video inspired by images 1-5. Background music references @video1.”