A collection of codecs and related tools, K-Lite Codecs are required to encode and/or decode (play) audio and video. The K-Lite Codec Pack is designed as a user-friendly solution for playing all your movie files.
It is an excellent tool to solve the problem that can not play or convert diverse files such as FLV format etc. With the K-Lite Codec Pack you should be able to play 99% of all the movies that you download from the internet

XP Codec Pack is one of the most completed codec packs which helps you to play all major audio and video formats.
If you can not play or convert RM format file,Now XP Codec Pack can solve the problem easily.

A DirectShow filter pack specifically built for playing anime, it has been assembled by some of the most knowledgeable people in online anime distribution, and one of the primary design goals is to play as much as possible with as little as possible. The CCCP(Combined Community Codec Pack) attempts to be as unintrusive on your system as possible.

you can play QuickTime files (.mov, .qt, .3gp and other extensions) without having to install the official QuickTime Player. It also supports QuickTime content that is embedded in webpages.

you can play RealMedia files without having to install RealPlayer/RealOne Player.

It's Format including Windows Media Video and Audio

Using the OGM instead of the common AVI wrapper has several advantages, namely the fact that the audio and video should always, under virtually any circumstances, maintain synch. The package contains the actual DirectShow filters as well as various tools for handling .ogm streams, such as Ogg Splitter and Ogg Multiplexer.