An upscaler that lives in your browser, CLI, and video pipeline

What it does

Anime4KCPP is a C++17 anime upscaler built around a CNN algorithm. It ships as a core library wrapped into a CLI tool, an optional Qt GUI, Python and C bindings, and even a WebAssembly playground that runs in your browser. If you are working with video, you can drop it into existing workflows instead of treating it as a separate app.

The interesting bit

Most upscalers are standalone programs; this one behaves like infrastructure. It offers DirectShow, AviSynth, and VapourSynth filters so you can slot upscaling into media pipelines without rewriting your workflow.

Key highlights

• CNN-based upscaling with a stated goal of simplicity and efficiency
• Compute flexibility: optional CUDA and OpenCL acceleration, plus auto-detected CPU SIMD ranging from SSE to AVX512, NEON, and WASM SIMD128
• Pipeline integrations: AviSynth, VapourSynth, and Windows DirectShow filters
• A browser-based playground for testing via WebAssembly
• Optional FFmpeg-based video module, Qt GUI, and language bindings

Caveats

• The WebAssembly playground requires disabling Microsoft Edge’s Enhanced Security for optimal performance
• DirectShow filter support is Windows-only
• CUDA, Qt, and FFmpeg are flagged as manual dependencies and must be provided by the builder

Verdict

Worth a look if you encode or archive anime and want a pipeline-native upscaler rather than a monolithic app. Casual users may find the CMake-heavy, feature-flag build process more work than it’s worth.