High Quality Content by WIKIPEDIA articles! ffdshow is a media decoder and encoder mainly used for the fast and high-quality decoding of video in the MPEG-4 ASP (e.g. encoded with DivX, Xvid, or FFmpeg MPEG-4) and AVC (H.264) formats, but it supports numerous other video and audio formats as well. It is free software released under the GPL license, runs on Windows, and is implemented as a DirectShow and VFW decoding filter.