Real-Time Video Coding

From WirelessAfrica
Revision as of 12:21, 26 March 2009 by Ralf (talk | contribs) (→‎DirectShow Filter Downloads)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)


The objective of the Real-Time Video Coding group is to research and develop intelligent multimedia software components and delivery systems that adapt to congested and low infrastructure network environments. The emphasis is on jointly-optimised or co-operative behaviour between the delivery context, as in real-time network conditions, and the video/audio encoder rate control mechanisms. Innovative solutions are sought to enhance the Internet video experience in a developing world context where bandwidth is a scarce resource.

Current research within the group is concentrating on optimal and weighted context-based bit allocation techniques and implementations within international standard video codecs. A scalable and bandwidth adaptive multimedia broadcasting platform is under development to encompass the novelty of the bit allocation research.

Contact Details

Contact Person: Dr Keith Ferguson
Tel: +27(0)12 841 4433
Fax: +27(0)12 841 4720


30 September 2007 - IEEE students seminar at UCT

13 March 2008 - Seminar at UKZN

14 May 2008 - Guest lecture on Video Coding at University of Pretoria


Papers will be available here once complete.


A part of the objective of the Real-Time Video Coding group is to utilise open source frameworks and to contribute to the open source community as well as to provide source code that is available for general usage. Please send comments, feedback, suggestions to rtvc[at]

DirectShow Filter Downloads

DirectShow crop, scale, audio RTSP, RGB-YUV420 conversion filters can be downloaded from the sourceforge repository


Source Downloads

  • Base classes and interfaces - DirectShow base classes and interfaces have been written which simplify the creation of a transform filter.
    • The CCustomBaseFilter class provides a base class for filters with a single input and output pin.
    • The MultiIOBaseFilter class provides support for writing DirectShow transform filters with multiple input and output pins such as multiplexers and demultiplexers. All Meraka RTVC filters inherit these base classes, which are available in the download. The base classes have been compiled into a static library.
  • Filter Source Code
    • Scale filter
    • Crop filter
    • RGB to YUV420 Planar filter
    • YUV420 to RGB filter
    • RTSP audio source filter which can play 8/16-nit PCM audio streams. This filter uses the open source live555 streaming media library to handle the RTSP/RTP aspects of streaming audio. This filter shows how the DirectShow framework can be combined with the live555 library to facilitate standard compliant streaming over the Internet. It can be can easily be extended to handle other media types such as mp3, video data etc.
  • Image Utilities - The ImageUtils folder contains source code for various image processing such as cropping, scaling, etc. These files have been compiled into a static library which is also referenced by filters that require such functionality.

The entire source code is available at our subversion repository at


  • Consortium Wiki (secure login required)
    • Consortium Wiki This is the wiki for project information related to the Bandwidth Adaptive Real-Time Video Broadcasting over Internet project, known as ARTIST