System Requirements Document (SRD)

Project Name: emerald-story

1. Introduction

The emerald-story project is an innovative AI-powered application designed to transform user-provided story text into fully automated cartoon videos. This app aims to provide a seamless, one-click experience for users to create professional-quality cartoon movies. By leveraging cutting-edge AI technologies, the system automates every step of the process, from script analysis to video rendering, ensuring simplicity and efficiency for users.

The app is tailored for users in India (IN), with a focus on Hindi and English storytelling. It incorporates unique features like "Lalchi cartoon mode" for exaggerated comedic storytelling, making it a standout tool for content creators, educators, and entertainment enthusiasts.

2. System Overview

The emerald-story system is a fully automated pipeline that converts user-inputted story text into a complete cartoon video. The system performs the following tasks:

• Script Analysis: Breaks down the story into scenes, dialogues, and emotional tones.
• AI Image Generation: Creates cartoon-style visuals for each scene, ensuring character consistency.
• Multi-Voice Generation: Detects characters, assigns voices, and modulates tone based on emotions.
• Video Rendering: Combines images, voiceovers, background music, and transitions into a polished video.

The system is designed to be intuitive, requiring minimal user input while delivering professional results. Users can optionally tweak characters, voices, or scenes after previewing the video.

3. Functional Requirements

As story points:

• As a User, I should be able to paste or type my story text into the app.
• As a User, I should be able to select the story language (Hindi or English).
• As a User, I should be able to choose the video duration (8, 15, or 20 minutes).
• As a System, I should automatically analyze the story and divide it into scenes.
• As a System, I should generate short scripts, dialogues, and detect emotions for each scene.
• As a System, I should create cartoon images for each scene in styles like Kids Cartoon, Anime, Realistic Cartoon, and Lalchi Cartoon.
• As a System, I should ensure character consistency across all scenes.
• As a System, I should detect characters' names and genders from the story text.
• As a System, I should assign appropriate voices to characters based on gender and emotion.
• As a System, I should modulate voice pitch, speed, and tone based on emotions like Happy, Sad, Angry, or Horror.
• As a System, I should sync dialogues with lip movements and scene transitions.
• As a System, I should add background music and sound effects based on the story's mood.
• As a User, I should be able to manually override voice assignments and styles.
• As a User, I should be able to preview the video and make unlimited corrections.
• As a User, I should be able to export the video in 720p or 1080p resolution.
• As a User, I should be able to share the video directly to platforms like YouTube, Facebook, and WhatsApp.
• As a System, I should generate a viral hook for the first 5 seconds of the video.
• As a User, I should be able to build custom characters by modifying their face, clothes, and voice.
• As a System, I should support Hindi ↔ English translation for multi-language storytelling.
• As a System, I should provide a "Lalchi Cartoon Mode" with exaggerated expressions and comedic storytelling.

4. User Personas

1. General User

• Description: Individuals who want to create cartoon videos from their stories for personal or professional use.
• Goals: Simplify the process of creating engaging cartoon videos.
• Needs: Easy-to-use interface, automated features, and customization options.

2. Content Creators

• Description: Social media influencers, YouTubers, and educators creating content for their audiences.
• Goals: Produce high-quality, unique videos quickly.
• Needs: Advanced customization, multi-language support, and direct sharing options.

3. Children and Educators

• Description: Parents, teachers, and children using the app for storytelling and educational purposes.
• Goals: Create fun and engaging cartoon videos for learning and entertainment.
• Needs: Kid-friendly visuals, simple workflows, and educational themes.

5. Visuals Colors and Theme

Color Palette:

• Background: #F4F8FB (Soft Sky Blue)
• Surface: #FFFFFF (Pure White)
• Text: #2C3E50 (Deep Navy Blue)
• Accent: #FF6F61 (Vibrant Coral Red)
• Muted Tones: #B0BEC5 (Cool Gray)

This palette reflects a playful yet professional tone, suitable for both children and adults.

6. Signature Design Concept

"Living Storybook" Homepage

The homepage will resemble an interactive storybook that comes to life as users scroll.

• Visuals:

  • A 3D animated book opens as the user lands on the page.
  • Each section of the homepage (features, testimonials, etc.) appears as a new "page" in the book.
  • Cartoon characters from the app's library pop out of the book, interacting with the user (e.g., waving, pointing to features).

• Animations:

  • Smooth page-turning animations as users scroll.
  • Characters move dynamically, reacting to user actions like hovering or clicking.

• Interactions:

  • Users can "flip" through the book manually or let it auto-scroll.
  • A glowing "Start Your Story" button on the last page invites users to begin their journey.

This design creates an unforgettable first impression, immersing users in the storytelling experience from the moment they arrive.

7. Non-Functional Requirements

• Performance: The system must generate a 15-minute video within 5 minutes on average.
• Scalability: Support up to 1 million active users per month.
• Availability: 99.9% uptime guarantee.
• Security: Ensure data privacy and secure storage of user-generated content.
• Localization: Support Hindi and English languages with accurate translations.

8. Tech Stack

Frontend:

• React for web application.
• React Native for mobile application.

Backend:

• Python with FastAPI for API development.

Database:

• MySQL for structured data.
• MongoDB for unstructured data.

AI Models:

• GPT 5.4 for user-friendly text analysis.
• Stable Diffusion for image generation.
• ElevenLabs for voice synthesis.

Tools:

• FFmpeg for video processing.
• Docker and Kubernetes for containerization and orchestration.

9. Assumptions and Constraints

• Assumptions:

  • Users will primarily use the app on mobile devices.
  • Internet connectivity is required for all AI-powered features.

• Constraints:

  • Video export resolution is limited to 720p and 1080p.
  • Character customization is restricted to predefined templates.

10. Glossary

• AI: Artificial Intelligence.
• Lalchi Cartoon Mode: A comedic cartoon style with exaggerated expressions.
• FFmpeg: A tool for video processing and editing.
• Voice Modulation: Adjusting pitch, speed, and tone of a voice.

This document provides a comprehensive blueprint for the emerald-story project. Let me know if you'd like to refine or expand any section further, Manoj!