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The K-Lite Mega Codec Pack is a free software bundle which includes the K-Lite Codec Pack Full and Real Alternative. Codec is short for Compressor-decompressor. Codecs are needed for encoding and decoding (playing) audio and video. With the K-Lite Mega Codec Pack you can play almost all audio and video files there are. It also has encoding support. The very user-friendly installation is fully customizable, which means that you can install only those components that you want. You can also make an unattended installation.

Same as Full, plus:

A few ACM/VFW codecs such as x264VFW
This type of codec is used by certain video editing/encoding applications for working with AVI files.
These codecs are not used or needed for normal playback.
The codec pack does not magically expand the import abilities of professional editors such as Vegas or Premiere. Those applications usually (only) use their own internal codecs and only support import of specific file formats.

Contents of K-Lite Mega Codec Pack

Below you can find a list of all components that are included in the pack. Please note that not all of these components will be installed. There are some groups of two (or more) components that share a similar purpose. During installation at most one component from each group can be selected. Furthermore, some of the included components are not needed by the average user, and therefore they will not by installed by default. The installer is fully customizable, so you can let it install exactly those components that suit your specific needs.

Contents of version 16:
Player:

Media Player Classic Homecinema [version 1.9.14.18]
DirectShow video decoding filters:

LAV Video [version 0.75.1-0-gc0e87]
ffdshow [version 1.3.4534] *
XviD [version 1.3.7] *
DirectShow audio decoding filters:

LAV Audio [version 0.75.1-0-gc0e87]
ffdshow [version 1.3.4534] *
AC3Filter [version 2.6.0b] *
DirectShow source filters:

LAV Splitter [version 0.75.1-0-gc0e87]
DirectShow audio parsers:

DC-Bass Source Mod [version 1.5.2] [x86]
DirectShow subtitle filters:

DirectVobSub [xy-VSFilter version 3.2.0.806]
XySubFilter [version 3.2.0.806]
Other filters:

MPC Video Renderer [version 0.5.5.1733]
madVR [version 0.92.17]
Haali Video Renderer [version 1.13.138.14]
VFW video codecs (for video editing):

ffdshow VFW interface
XviD [version 1.3.7]
x264 [revision 2851]
Lagarith [version 1.3.27]
huffyuv [version 2.1.1 CCE Patch 0.2.5]
ACM audio codecs (for video editing):

MP3 (LAME) [version 3.99.5] [x86]
AC3ACM [version 2.2] [x86]
Tools:

Codec Tweak Tool [version 6.5.3]
MediaInfo Lite [version 21.03]
GraphStudioNext [version 0.7.1.62]
VobSubStrip [version 0.11]
FourCC Changer
Shell extensions:

Icaros ThumbnailProvider [version 3.2.1]
Icaros PropertyHandler [version 3.2.1]
* = These components are not installed by default, but are alternative choices.