GGCX

GGCX, short for Graphical Codec/Filter Configuration Extension, is a Windows-based plugin framework designed to manage graphical configuration for external video filters and codecs in AviSynth-centric workflows. It provides a generic runtime and user interface that lets host applications load third-party plugins and present their configuration dialogs to the user. By decoupling filter parameter dialogs from the host application, GGCX enables a consistent user experience across different video editors and processing tools that rely on AviSynth scripts.

Originally developed in the early 2000s by members of the community around AviSynth, GGCX aimed to simplify adding new filters without modifying each host program. It gained use through VirtualDub, AvsP, and other AviSynth-compatible tools, where users could install GGCX and a collection of filter plugins.

Architecture-wise, GGCX runs as a small executable or service that the host application can invoke when a filter needs to be configured. Plugins expose a configuration interface and declare their parameters; GGCX loads these plugins based on registration data and builds a dialog to capture user input. The values are then passed back to the host, which applies them to the underlying script or processing pipeline.

Usage typically involves installing GGCX, a plugin pack, and registration files. The user opens a project in a host application, triggers a filter configuration, and GGCX presents the relevant UI, after which the host applies the selected settings during processing.

GGCX is maintained by a community of contributors and appears in archival repositories and documentation alongside AviSynth and VirtualDub.