GDCL's technology pages contain a substantial body of freely-reusable tools. The articles page contains papers and source code discussing advanced programming topics. It currently includes source code to a multiple-graph toolkit and working demultiplexor filters for mpeg-1 and MP4.

About GDCL

About Geraint Davies.

DirectShow and WDM

GDCL concentrate on development of DirectShow filters and device drivers for digital video and audio processing, and consulting on a range of system software areas.

Geraint Davies was the original designer of the DirectShow technology.

For more information, advice and sample code, see the GDCL Technology pages.

Windows Mobile graph editor and monitor filters here

Mpeg-4 File format filters available for download

GMFBridge Multiple Graph toolkit and article

Technology Overview

An overview of the DirectShow filter architecture

A technical Q & A for developers

List of downloads

News

• Windows Mobile graph editor tool and utility filters here.
• GMFBridge 1.0.0.18 fixes a problem with surface loss (change of display) that several people have reported. Includes 64-bit and 32-bit builds.
• Version 1.0.0.5 of the mpeg-4 mux and demux now support a wider range of encoders and decoders for mpeg-4 video and h.264. Details here.
• The mpeg-4 multiplexor now supports CTTS tables for re-ordered frames. See here.
• Updated versions of the MPEG-4 multiplexor and demultiplexor (1.0.0.4) are available here. These include 64-bit builds and numerous bug fixes.
• The GDCL website now has an RSS feed which is updated with all additions to the website and software updates.