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ffdshow is an open-source unmaintained codec library that is 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.
The encoder and decoder have been part of the free, open-source library libavcodec in the project FFmpeg since June 2003. [5] FFV1 is also included in ffdshow and LAV Filters, [6] which makes the video codec available to Microsoft Windows applications that support system-wide codecs over Video for Windows (VfW) or DirectShow.
The options to use ffdshow for decoding is removed as well. However, after installation a user can still use them for decoding by enable them manually with Codec Tweak Tool. Moreover, the ffdshow processing filters are still kept, and new options to load them in all compatible DirectShow players are added. [7]
libavcodec is an integral part of many open-source multimedia applications and frameworks. The popular MPV , xine and VLC media players use it as their main, built-in decoding engine that enables playback of many audio and video formats on all supported platforms.
For instance, after the open source DirectShow decoding filter ffdshow has been installed, fast and high quality decoding and postprocessing of the MPEG-4 ASP, H.264, and Flash Video formats is available in the original MPC. MPC-HC and MPC-BE, however, can play videos in these formats directly without ffdshow.
The quality the codec can achieve is heavily based on the compression format the codec uses. A codec is not a format, and there may be multiple codecs that implement the same compression specification – for example, MPEG-1 codecs typically do not achieve quality/size ratio comparable to codecs that implement the more modern H.264 specification.
Open source [34] Yes Yes Yes Yes [35] Yes [36] As Vorbis comments [Y] WebM.webm Google: 2010-05 Royalty-free [38] Yes Yes Yes Yes Yes [39] Yes [39] RealMedia Variable Bitrate .rmvb RealNetworks: 2003 Proprietary: Yes Yes Yes Yes Yes [40] No DivX Media Format (DMF) .divx DivX, Inc. 2005-06 Proprietary: Yes Yes Yes Yes Yes Yes
Support for Quick Sync hardware accelerated decoding of H.264, MPEG-2, and VC-1 video is widely available. One common way to gain access to the technology on Microsoft Windows is by use of the free ffdshow filter. Some other free software like VLC media player (since version 2.1.0 "Rincewind") supports Quick Sync as well.