This system analyzes silent video files and generates synchronized audio by processing visual cues, motion patterns, and contextual information through a multi-modal AI pipeline. The system examines each frame to understand scene context, then synthesizes environmental sounds, effects, and ambient audio that matches what's happening on screen.
The core architecture processes video through several parallel analysis streams. One pathway extracts visual features like objects, lighting, and scene composition. Another tracks motion vectors and temporal changes. A third interprets contextual information about the environment, whether it's indoors, outdoors, urban, or natural. These streams feed into an audio generation model that creates sound matching the analyzed content. The default output runs 8 seconds, with duration controls available through advanced settings.
Beyond video-to-audio conversion, this system handles multiple input types through a credit-based system. Text prompts generate standalone audio files at 1 credit each. Background music creation from text descriptions costs 4 credits and produces 30-second tracks. Text-to-speech conversion scales at 1 credit per 1000 characters. Text-to-video generation requires 5 credits per output. Each generation task processes independently but uses the same underlying multi-modal analysis approach.
Users can modify generated audio through built-in customization tools. Sound levels adjust independently. Effects stack and combine. The system supports negative prompts to exclude unwanted audio elements. Auto-translation handles non-English prompts, though optimal results require English keywords separated by commas. This preprocessing limitation stems from how the model was trained and what linguistic patterns it recognizes most accurately.
API access becomes available starting with the Basic plan at $12.49 monthly when billed yearly. Key management handles authentication and rate limiting. Lower tiers restrict format support to MP4 only, while Advanced and Premium plans process all video formats. File size caps vary considerably across tiers. Starter and Basic plans max out at 50 MB. Advanced allows 200 MB. Premium handles up to 500 MB.
The credit allocation system determines practical usage limits. Free accounts receive 1 credit daily through login rewards. Starter offers 150 monthly credits at $0.028 each. Basic offers 450 credits at the same per-credit rate. Advanced jumps to 1,000 credits at $0.025 each. Premium delivers 2,000 credits at $0.021 per unit. These credits don't appear to roll over based on the monthly allocation structure.
Processing speed completes most transformations within minutes, though exact timing depends on video length and complexity. The system outputs studio-quality audio with tight synchronization to visual events. Comparisons with Movie Gen Audio demonstrate how it handles specific sound scenarios like frozen water breaking, gentle wave patterns, and metal shovel digging into surfaces.
This system doesn't integrate with external tools or services. Everything processes through the web interface or API. No mobile apps exist. No browser extensions. The workflow stays entirely within its ecosystem, which simplifies the technical stack but limits automation possibilities.
Format restrictions on lower tiers create real constraints for professional workflows that handle diverse video codecs. The 50 MB limit on Starter and Basic plans excludes most high-resolution footage. The English keyword requirement for optimal prompt results adds friction for non-English speakers, even with auto-translation attempting to bridge the gap.
