Automating Video Generation with Remotion and VOICEVOX: From Environment Setup to Performance Optimization

Introduction: An Approach to Automating Video Generation When attempting to generate videos programmatically with Remotion, you may encounter issues such as ffmpeg or ffprobe downloads never finishing, or processes stalling. The evolution of AI and LLMs is significantly changing the content creation process. Historically, video production required extensive time and specialized knowledge, from scriptwriting to editing, speech synthesis, and rendering. However, with the maturation of AI technology, the barriers to video production are lowering, making programmatic automated video generation a realistic option. This article explains how to build a video generation system combining the React-based video generation framework "Remotion," the speech synthesis engine "VOICEVOX," and AI tools like "Cursor AI" and "Gemini 3.1 Pro." We will introduce rendering errors encountered during actual development and performance tuning techniques. From environment setup to code implementation, and optimi