Flowframes is a Windows desktop application for AI-based video frame interpolation. It provides a GUI (WinForms) to orchestrate interpolation using models like RIFE, DAIN, and FLAVR, running on CUDA (PyTorch) or NCNN (Vulkan) backends. The core pipeline extracts frames from input videos via FFmpeg, runs AI inference to generate intermediate frames, and re-encodes the result. It supports batch processing, resume from interruption, various output formats (video, GIF, image sequences), and hardware acceleration detection. The architecture is a monolithic C# application that spawns external processes (FFmpeg, Python scripts, NCNN binaries) and manages their lifecycle. The codebase includes a legacy CodeLegacy folder with near-duplicate files, indicating incomplete refactoring. It also bundles a large vendored Python environment (pip, setuptools, etc.) for the AI runtimes, which introduces maintenance overhead. Despite these issues, the application is functional and actively maintained, with useful utilities like a Fraction struct for rational FPS arithmetic and a rolling average class for performance monitoring.