MySQL AB - (Free)
The collection of codecs and filters of K -Lite Mega Codec Pack allows to play any video no matter the format it has.
With K-Lite Mega Codec Pack, it seems difficult to miss a video, whatever its format. This codec pack contains all the elements needed to read the files to the most popular audio and video formats: DivX, XviD, 3ivX, QuickTime, AC3, FLAC, CoreAVC, Cyberlink DVD decoder, MPEG-2, On2, Windows Media 9, etc.
The pack also includes multimedia BSplayer and Media Player Classic readers.
It contains DirectShow video decoding filters (XviD, DivX, DivX H.264, On2 VP7, MPEG -2) DirectShow audio decoding filters ( AC3/DTS/LPCM, Vorbis , AAC), DirectShow audio parsers (FLAC, WavPack, MusePack, Monkey 's Audio, OptimFROG, AMR, DC- Bass Source, AC3/DTS Source), DirectShow source filters (Haali Media Splitter, AVI Splitter, MP4 Splitter, Matroska Splitter, Ogg splitter, MPEG PS / TS, FLV, CDXA ), Real Alternative ( RealMedia codecs, RealMedia plugin for Internet Explorer / Firefox / Mozilla / Netscape / Opera / Chrome, RealMedia DirectShow splitter) and other various tools (Codec Tweak Tool, Win7DSFilterTweaker, MediaInfo Lite, GSpot Codec Information Appliance, VobSubStrip, GraphStudio, Haali Muxer, FourCC Changer Bitrate Calculator) that makes it a good choice for any movie passionate.