The K-Lite Mega Codec Pack is a collection of almost all codecs and related tools. Codec is short for Compressor-decompressor. This Pack includes codecs for the most popular compressions like Divx and Xvid as well as some of the less popular but still necesary codecs, needed for encoding and decoding (playing) audio and video. With the K-Lite Codec Pack you should be able to play 99% of all the movies that you download from the internet. The K-Lite Mega Codec Pack includes the K-Lite Codec Pack Full, Media Player Classic, BSplayer, Bink and Smacker playback support and Monkey's Audio DirectShow decoder.

Changes from K-Lite Mega Codec Pack 1.56 to K-Lite Mega Codec Pack 1.57 :
- Added: DScaler5 MPEG-1/2 decoder [version 0.0.8.0]
- Updated: Cyberlink MPEG-1/2 decoder to version 6.0.2.2806
- Removed: Ligos MPEG-1/2 decoder
- Merged: all DVD and MPEG decoders into one section.
- Removed: Ligos MPEG audio decoder
- Removed: Ligos MPEG demuxer
- Updated: Cyberlink MPEG demuxer to version 1.0.0.3726
- Updated: AC3Filter to version 1.09a
- Updated: CoreAAC to version 1.2.0.575
- Updated: ff_libfaad2.dll in ffdshow
- Added: oggdropXPd [version 1.8.9 aoTuVb4.51]
- ffdshow is now the default H.264 decoder instead of CoreAVC. It is slower, but more compatible.
- Updated: QuickTime components to version 7.1.0.210
- IMPORTANT: Windows 2003/XP64 users should run WindowsUpdate before installing. Patch KB921398 fixes an issue that causes QuickTime to crash on those systems.
- RealMedia and QuickTime browser plugin installation is now also able to detect the Seamonkey browser
- Minor changes