A system for development of authoring, editing, analyzing and compressing / decompressing algorithms for video and audio is presented. The system uses DirectShow, QuickTime and its own MPEG-4 framework. It supports multi-language and multi-platform (native, Java and .Net) plug-in system. The system's core as well as its GUI (graphical user interface) gives access to any data in the process of authoring, editing and analyzing. The system gives extensive access to compressed and non-compressed data in many of its representations. This way the system is suitable for developers of multimedia tools or for specialists who need to modify data that is inaccessible in other editing tools.