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How It Works

Understanding VPA's analysis pipeline and prompt generation.

VPA uses a multi-stage pipeline to transform visual content into optimized AI video prompts. Here's what happens behind the scenes when you run an analysis.

The Analysis Pipeline

1. Frame Extraction

VPA extracts key frames from your video at strategic intervals. The number of frames depends on your selected frame count setting (2-8 frames). For YouTube videos, we download and process the video server-side.

2. Visual Analysis

Each frame is analyzed by a vision-capable AI model from the main ai vendors (like OpenAI, Antropic or Google). The model identifies:

  • Camera Movement: Pan, tilt, zoom, dolly, tracking, static
  • Composition: Rule of thirds, symmetry, leading lines, depth
  • Lighting: Direction, quality, color temperature, contrast
  • Color Palette: Dominant colors, grading style, saturation
  • Subject Matter: People, objects, environment, actions
  • Mood/Atmosphere: Emotional tone, energy level, genre indicators
  • Motion: Speed, direction, fluidity of movement

3. Temporal Analysis

By comparing multiple frames, VPA understands how the scene evolves over time. This helps identify:

  • Camera movement patterns
  • Subject motion and behavior
  • Lighting changes
  • Pacing and rhythm

4. Generator-Specific Optimization

The raw analysis is then transformed into a prompt optimized for your selected AI video generator. Each generator has different:

  • Character Limits: Sora (1000), Veo (800), Runway (500), Kling (600)
  • Preferred Vocabulary: Technical vs. descriptive language
  • Emphasis Areas: What each generator responds to best
  • Structure: How information should be ordered
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Why optimization matters

A prompt that works great for Sora might produce poor results in Runway. VPA's generator-specific optimization ensures you get the best results from each tool.

Style Anchors (Alternative Path)

When using Style Anchors instead of a video, VPA skips frame extraction and visual analysis. Instead, it builds a prompt from your selected style attributes:

  • Mood (cinematic, dreamy, energetic, etc.)
  • Camera Movement (slow pan, tracking shot, handheld, etc.)
  • Lighting (golden hour, dramatic shadows, soft diffused, etc.)
  • Color Palette (warm, cool, desaturated, vibrant, etc.)
  • Era/Style (vintage, modern, futuristic, etc.)
  • Genre (documentary, commercial, music video, etc.)

Refinements

After generating a prompt, you can apply refinements - one-click adjustments that modify specific aspects of the prompt without starting over. Refinements use the AI to intelligently adjust the prompt while maintaining coherence.

Technical Details

Supported Video Formats

  • MP4, WebM, MOV, AVI
  • Maximum file size: 100MB
  • Recommended length: 5-60 seconds

Frame Selection Algorithm

VPA uses intelligent frame selection to capture the most representative moments:

  • Evenly distributed across the video duration
  • Avoids duplicate/similar frames
  • Prioritizes frames with clear subjects