ffdshow is an open-source unmaintained codec mainly used for decoding of video in the MPEG-4 ASP (e.g. encoded with DivX or Xvid) and H.264/MPEG-4 AVC video formats, but it supports numerous other video and audio formats as well. It is free software released under GNU General Public License 2.0, runs on Windows, and is implemented as a Video for Windows (VFW) codec and a DirectShow filter.
ffdshow does not include a media player or container parsers. Instead, after installation of ffdshow, compatible DirectShow or VFW media players such as Media Player Classic, Winamp, and Windows Media Player will use the ffdshow decoder automatically, thus avoiding the need to install separate codecs for the various formats supported by ffdshow. The user configures ffdshow's audio and video settings by launching the ffdshow video decoder configuration program independently of any media player.
For playing transport stream files such as AVC(H.264) an additional media splitter should also be installed. There are several free media splitters available such as the LAV Filters and Haali Media Splitter.