K-Lite Codec Pack

"K-Lite Codec Pack is a collection of codecs, DirectShow filters and tools."
EditByBrothersoft: The K-Lite Codec Pack is a free collection of codecs and related tools. Codec is short for Compressor-decompressor. Codecs are needed for encoding and decoding (playing) audio and video. The very user-friendly installation is fully customizable, which means that you can install only those components that you want.
There are three versions of the K-Lite Codec Pack: The Standard version contains everything what is needed to play all the commonly used formats. The Full version contains even more codecs and also has encoding support. The Corporate version is a special version for use in a corporate environment.

Features of the K-Lite Codec Pack 4.8.5 Full:

Player:
Media Player Classic Homecinema 1.2.1008.0
Media Player Classic 6.4.9.1 rev. 100 - This is a full-featured player with many options and useful functionality. It has internal filters for opening various container formats such as MP4, Matroska, FLV and Ogg. It is also capable of playing QuickTime and RealMedia content if those frameworks are installed. The Home Cinema version has internal DXVA decoders for H.264 and VC-1 video.

ffdshow:

ffdshow revision 2954 - ffdshow is a very powerful DirectShow filter that can decode many audio and video formats. It also contains lots of options for manipulation of the audio and video, such as resizing and post-processing. Examples of supported video formats are: DivX, Xvid, MPEG-4, H.264/AVC, MPEG-2, VC-1, H.263, FLV1, FLV4, VP3, VP6, Theora, SVQ1, SVQ3 and MJPEG. Examples of supported audio formats are: MP3, AAC, AC3, DTS, LPCM, Vorbis, MP1, MP2, E-AC3, Dolby TrueHD, AMR, Nellymoser and IMA ADPCM.

ffdshow VFW interface - VFW decoder that supports many video formats. VFW encoder for a few video formats: MPEG-4, DV, H.263, Theora, MPEG-2, MPEG-1, MJPEG and a couple more.
Extra plugins: Kernel and TomsMoComp deinterlacers and DScaler plugin. you can free download K-Lite Codec Pack 4.8.0 now.