The DefilerPak is a minimalist collection of video and audio codecs designed to keep you up to date with the latest developments.

Note: I do my best to select the optimal component versions, but this has become a very complicated task.
There are now several hundred possible DefilerPak installation scenarios, and tens of thousands of possible ffdshow settings combinations.
Even these numbers fail to take into account the possibility that some other codec pack you tried once didn't uninstall cleanly,
or that the file you are attempting to play was encoded with a broken version of some hacked implementation of something or other.
All of the DefilerPak components undergo extensive testing, both alone and together, but as you can see:
Results may vary. Use only as directed. Consult your physician before using any decoder pack.
If you mention that you use a codec pack on the Doom9 forums, someone may hurt your feelings.

For playback, I recommend Media Player Classic or Zoom Player.
These two are, in my opinion, the best. However, DefilerPak is compatible with all DirectShow players.
Feel free to choose one that sucks.

What's included?
ffdshow: Rapidly making codec packs obsolete. Plays almost everything.
Haali Media filter: Supports the Matroska, MP4, and OGM A/V container formats.
VSFilter: Supports a wide variety of subtitle formats.
DivX ;-) Audio: Just in case.
AC3 XForm filter: Makes life a little easier for folks with external Dolby Digital decoders.
HDTVPump: Support for HD/ATSC transport streams.

CodecPack All in 1 - Стандартный набор аудио и видео кодеков для работы и просмотра видео.

Ace mega codecs pack - a free collection of codecs, filters and tools that you'll find useful
This is the latest and greatest release of the famous ACE Mega CoDecS Pack. In this codec collection you can find plenty of useful CoDecS (CoderS/DeCoderS), Media Players, Media Player Filters and other Utilities. Also I added Authoring ToolS for video watchning, audio and video processing. In Add-On Pack you can found Authoring ToolS for content creation.

ACE Mega CoDecS Pack uses a brand new filter manager technology! Please refer with DashBoard section!

Because of ACE Mega CoDec Pack DashBoard the installation process has been changed! Please read the INSTALLATION Section carefully!

The ACE Mega CoDecS Pack installer from version 6.00 only unpacking the files, then the DashBoard registers and configures them. So never remove files, except when you know what do you do! DashBoard registers and configures CoDecs and FilterS and from this unified User Interface you can do every settings you want.