OVI Image to Video - AI Model Guide

OVI Image to Video (character-ai/ovi-i2v) is a multimodal AI model developed by Character.AI. It transforms static images and text prompts into 5-second video clips with synchronized audio in a single generation pass, using the Twin Backbone Cross-Modal Fusion architecture described in arXiv paper 2510.01284.

Yes. OVI performs simultaneous audio-video co-generation in a single inference pass. Unlike most video AI models that require separate audio post-processing, OVI produces both the video stream and a matching audio track together, making it one of the few publicly accessible models with true audio-video co-generation capability.

OVI supports speech synthesis through special prompt tags. You embed spoken dialogue directly into your text prompt using the format <S>...<E> tags. The model will synthesize the spoken content and include it in the generated audio track, allowing you to create videos with character dialogue without any external text-to-speech tools.

OVI outputs video at 720×720 area resolution across multiple aspect ratios: 9:16 (portrait), 16:9 (landscape), and 1:1 (square). All outputs are rendered at 24 frames per second. This flexibility makes OVI suitable for social media content, cinematic clips, and square-format storytelling.

OVI generates 5-second video clips. Each clip includes synchronized audio produced in the same generation pass. While the duration is fixed at 5 seconds, the model supports rich text conditioning to control motion, scene atmosphere, sound design, and spoken dialogue within that timeframe.

Twin Backbone Cross-Modal Fusion is the neural architecture underlying OVI, detailed in arXiv paper 2510.01284. It enables simultaneous processing of visual and audio modalities, allowing the model to co-generate video and audio that are semantically and temporally synchronized from a single image and text prompt input.

Yes. OVI includes a seed parameter that enables exact reproduction of any generated video. By using the same seed, image, and prompt, you can recreate identical outputs, which is useful for iterative refinement workflows where you want to make incremental adjustments while keeping other elements consistent.

OVI is best suited for story-driven video content that requires both visuals and audio. Ideal use cases include animated storytelling, character dialogue scenes, social media short clips, and creative projects where synchronized sound design matters. It is the recommended model on CRAISEE when audio and video must be created together in one step.