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AI Video Generator — Turn Any Prompt Into HD Video with Sound
Writing a scene is the hardest part of filmmaking — the rendering should be instant. This AI video generator on Happy Oyster AI converts natural-language prompts into HD video with synchronized sound, drawing on Kling, Veo, Sora, Wan, Seedance, and more. Kling from Kuaishou leads the platform: its Diffusion Transformer architecture paired with 3D VAE spatiotemporal compression generates 5–10 second clips at 1080p/30fps across 16:9, 9:16, and 1:1 aspect ratios, with native audio co-generation — English and Chinese dialogue baked into the render, not layered on afterward. Veo from Google DeepMind outputs approximately 8 seconds of cinema-grade footage with foley sound effects and spoken dialogue synthesized from the prompt. Sora from OpenAI applies physics simulation — gravity, momentum, fluid dynamics — to produce up to 15-second videos where objects move as they would in the real world. Wan from Alibaba chains sequential shots with character identity persistence for multi-scene HD narratives. Seedance from ByteDance specializes in choreography and athletic sequences at 2K resolution with audio co-generation and lip-sync across 8+ languages. Every clip downloads watermark-free on paid generations.
Choose Your Text to Video AI Engine
Kling leads on speed and native audio. Each other engine solves a specific creative problem — physics realism, maximum duration, multi-shot sequencing, or choreography. Pick by what your scene actually demands.
Veo
Google DeepMind
Cinema-Grade Dialogue + Foley
Google DeepMind's cinema-grade text to video engine generates approximately 8-second clips at 720p or 1080p. Its defining capability for text-to-video workflows is native audio synthesis — spoken dialogue, foley sound effects (footsteps, impacts, environmental textures), and ambient atmosphere are generated directly from prompt language, not added in post. Fast mode returns results in minutes; Quality mode maximizes rendering fidelity for broadcast-ready output.
- ~8s at 720p/1080p
- Native dialogue synthesis
- Foley + ambient audio
- Fast and Quality render modes
Sora
OpenAI
Physics Simulation, Up to 15s
OpenAI's physics simulation engine generates up to 15 seconds of video where objects move according to real-world dynamics — gravity, momentum, fluid behavior, and material properties are all modeled. Liquids pour with viscosity, fabrics drape under weight, particles scatter with directionality. Standard mode offers the best value for long-form clips. Pro mode unlocks HD output for maximum visual fidelity on narrative-driven sequences.
- 10–15s per generation
- Gravity + fluid dynamics simulation
- Narrative-driven scene coherence
- Pro HD mode available
Kling
Kuaishou
DiT Architecture + Bilingual Audio
Kling's Diffusion Transformer architecture and 3D VAE spatiotemporal compression generate 5–10 second clips at 1080p/30fps with native audio co-generation — the model produces English and Chinese voice synthesis alongside visual frames in a single pass. Three aspect ratios (16:9, 9:16, 1:1) and motion control parameters give precise creative direction. The fastest text-to-video engine on the platform, making it the default choice for social content and rapid iteration.
- 5–10s at 1080p/30fps
- DiT + 3D VAE architecture
- EN/CN audio co-generation
- 16:9, 9:16, 1:1 aspect ratios
Wan
Alibaba
Multi-Shot Character Continuity
Alibaba's multi-shot sequencing engine chains shots with persistent character identity — the same subject appears with consistent appearance across scene cuts, which single-shot models cannot maintain. Generates 5–15 second HD clips at 720p or 1080p with audio-visual lock: dialogue, foley, and ambient layers synchronize across the entire sequence. The right choice when your creative brief requires continuity across multiple scenes.
- 5–15s multi-shot sequences
- 720p/1080p output
- Character identity persistence
- Cross-shot audio sync
Seedance
ByteDance
2K Choreography + 8-Language Lip Sync
ByteDance's motion-specialized engine reproduces complex choreography, martial arts, and athletic movement with biomechanically faithful body dynamics at 2K resolution. Audio is co-generated alongside video — not assembled separately — eliminating post-sync entirely. Phoneme-accurate lip animation across 8+ languages makes it the engine for global content where synchronized speech and precise physical performance must appear simultaneously.
- Up to 15s at 2K resolution
- Biomechanical body dynamics
- Audio-video co-generation
- Lip sync in 8+ languages
Kling-Powered Text to Video with Native Audio Co-Generation
Most AI video tools treat audio as an afterthought — they generate silent footage and push you to a separate editor for sound. This platform generates audio alongside video frames as a unified output. Kling's DiT architecture and 3D VAE compression learn spatiotemporal patterns that let the model predict not just what a scene looks like but how it sounds: a glass shattering, a car accelerating, a character speaking in English or Chinese — all synthesized in a single pass. Veo adds cinema-level foley and dialogue. Sora matches audio to physical events. Wan locks audio sync across multi-shot sequences. Seedance co-generates choreography and sound at 2K. Prompt engineering handles the rest: include motion verbs, camera directions, and audio cues in your description and each engine responds with coherent visual and sonic output.
What You Can Build with Text to Video AI
From commercial video to physics education — six production scenarios mapped to the engine architecture that fits each.
Video Ad Scripts That Render Themselves
Recommended: Kling (fastest) or Veo (native voiceover)
Write a 30-word ad concept and generate a polished video in under 5 minutes. Kling delivers the clip with bilingual voiceover fastest. Veo synthesizes dialogue and foley for broadcast-quality spots. Test three creative directions in Fast mode — then render the winner in Quality mode for the final deliverable.
Vertical Short-Form Content at Scale
Recommended: Kling (9:16, 5s, fastest delivery)
Kling natively outputs 9:16 video — ready for TikTok, Instagram Reels, and YouTube Shorts without crop or reformat. Five-second clips with built-in English or Chinese voiceover deliver a complete hook without recording setup. Generate 10 variations in an hour and A/B test performance before scaling ad spend.
Scientific and Physics Concept Visualization
Recommended: Sora (physics simulation, 15s)
Sora's physics engine models gravity, momentum, fluid dynamics, and material interactions — making it the right tool for science education content. Generate accurate visualizations of orbital mechanics, fluid flow, chemical reactions, or structural stress without animation software expertise. Ten-second explainer clips keep lesson segments compact.
Pre-Launch Product Reveal Videos
Recommended: Veo Quality mode (foley + 1080p)
Generate product reveal sequences with environment-matched sound design — surface textures produce appropriate contact foley, packaging opening triggers realistic audio, ambient music layers beneath the visual. Veo Quality mode renders 1080p output suitable for landing page hero videos and investor pitch decks. No product shoot required at concept stage.
Multi-Scene Narrative Storyboards
Recommended: Wan (character continuity, up to 15s)
Wan maintains character appearance across sequential shots — the same person walks into a room in shot one and is still recognizably the same person in shot four. Generate a complete narrative storyboard with consistent subjects across scenes. Fifteen-second maximum duration per clip allows substantial story arcs in a single generation.
Choreography and Dance Visual Content
Recommended: Seedance (2K, biomechanical precision)
Seedance renders hip-hop, contemporary, and martial arts movement with frame-accurate body positioning at 2K resolution. Co-generated audio means the beat and the movement emerge from the same model pass. Lip-sync in 8+ languages allows you to localize a performance for different regional markets without re-generating the visual.
From Prompt to Downloadable Video in Three Steps
No timeline editor, no asset library, no audio post-production. Write the scene, pick the engine, download the result.
Describe the Scene in Detail
Write what the camera sees, where it moves, and what sounds fill the frame. Specify subject actions, lighting conditions, environment, and any dialogue. Both English and Chinese prompts are supported. The richer the prompt, the more precisely the AI video generator renders your intent.
Select Engine, Duration, and Mode
Pick Kling for fastest delivery with bilingual audio, Veo for native foley and dialogue, Sora for physics-accurate motion up to 15 seconds, Wan for multi-shot character continuity, or Seedance for 2K choreography with co-generated audio. Choose Fast mode for rapid prototyping or Quality mode for final deliverables.
Download HD Video with Synchronized Audio
Generation completes in 1–5 minutes depending on engine and quality mode. Output is 1080p at 30fps (Kling) or 720p/1080p at 24fps (other engines). Audio is embedded in the video file. Download directly to your device.
Ready-to-Use Text to Video Prompt Templates
Four production scenarios with complete prompts. Copy and adapt — each is engineered to trigger specific model strengths.
Product Commercial with Dialogue
Best with Kling — bilingual audio co-generation
"A luxury fountain pen rests on a mahogany desk beneath warm directional lamp light. Camera performs a slow orbital movement from above left to a tight close-up of the nib. A calm, authoritative voice says: 'Every sentence is a decision.' Ambient leather-and-paper room tone underneath. Cinematic color grade, 16:9, 10 seconds."
Nature Documentary with Physics
Best with Sora — gravity and fluid simulation, 15s
"Slow-motion waterfall in Iceland. Water strikes the plunge pool and erupts upward in physically accurate droplet patterns. Mist catches the low Arctic sun, generating a partial rainbow. Camera starts at cliff height and descends slowly toward the base. Rocks in the pool visible through clear water. Natural ambient audio: rushing water, wind. 15 seconds, documentary cinematography."
Culinary Social Hook
Best with Kling — 9:16 vertical, 5s, instant delivery
"Molten chocolate poured over a scoop of vanilla ice cream in extreme close-up. The ice cream begins melting on contact, liquid pooling in slow motion. Overhead angle, warm food-photography lighting, shallow depth of field on the pour stream. Soft sizzle and dripping audio. 9:16 vertical, 5 seconds."
Abstract Physics Explainer
Best with Sora — physics simulation accuracy
"Magnetic field visualization in slow motion: iron filings arrange themselves into arc patterns around two opposing poles. Camera slowly orbits the field at tabletop level, revealing the 3D structure of the field lines. Scientific documentary style, neutral gray background, precise even lighting. No narration, subtle electronic ambient tone. 10 seconds."
How to Write Prompts That Work for AI Video
- • Lead with the main subject and its action - AI video generators prioritize the first noun-verb pair in your prompt. Start with the primary subject and what it does: 'A barista pours steamed milk into an espresso shot' gives the model a clear render target before camera and atmosphere details.
- • Specify camera movement with cinematography language - Generic prompts produce locked-off shots. Use cinematography terms: dolly in, rack focus, steadicam follow, overhead crane descent, handheld close-up. Kling and Sora both respond to camera direction vocabulary with measurably different framing results.
- • Name audio elements explicitly - Kling co-generates audio from prompt text — include dialogue in quotes, sound effects by name ('shattering glass', 'distant thunder'), and ambient layers ('street noise', 'cafe murmur'). Veo, Wan, and Seedance apply the same principle: named audio cues produce more faithful sound synthesis.
- • Anchor the visual style to a genre or medium - Unanchored style produces generic output. Reference a specific medium or genre: 'Arri Alexa film grain, anamorphic lens flare', 'BBC nature documentary, shallow depth of field', 'product launch commercial, clean white studio', 'noir wet street, high contrast 35mm'. Style anchors steer color science and lens behavior.
What Separates This AI Video Maker from Single-Model Tools
Four platform-level advantages no single-engine competitor can replicate.
Kling DiT Architecture — Fastest HD Output
Kling's Diffusion Transformer with 3D VAE spatiotemporal compression delivers 1080p/30fps video with native bilingual audio in a single generation pass — no separate audio render step
Five Engines, One Workspace
Run any prompt on Kling, Veo, Sora, Wan, or Seedance and compare outputs side by side — each architecture produces different visual physics, audio style, and motion characteristics from the same text
Prompt-to-Download in Under 5 Minutes
Fast mode across all engines returns a viewable, downloadable video in 1–3 minutes — iterate on creative direction without waiting for full-quality renders on every draft
Commercial Rights on All Paid Generations
Every paid-tier video generation includes full commercial usage rights — advertising, social media, broadcast, and client deliverables with no additional licensing fees
More Tools in Your Creative Pipeline
AI Video Generator FAQ
Architecture details, prompt strategies, output specs, and model selection guidance for text-to-video generation.
Your Scene Exists — You Just Haven't Written the Prompt Yet
Kling's DiT architecture and 3D VAE compression deliver 1080p/30fps video with native audio in English and Chinese. Veo produces cinema-grade dialogue and foley. Sora applies physics simulation for up to 15-second clips. Wan chains multi-shot sequences with character continuity. Seedance renders 2K choreography with co-generated audio in 8+ languages. Choose the engine that fits your creative brief.