Links

Codecs & DirectShow Filters:

Official DivX website

Official XviD website
Xvid source code. No codec downloads here!

AC3Filter & AC3File

Project Guliverkli (old)
Project Guliverkli2 (new)
Media Player Classic, VSFilter, RealMedia splitter, FLV splitter, etc.

ffdshow
A DirectShow filter that can decode many audio and video formats.

Haali Media Splitter
Source filter for the Matroska, MP4, Ogg, MPEG and AVI containers.

Monkey's Audio DirectShow decoder
Decoder for .ape files.

madFLAC
Source and decoding filter for FLAC audio.

MONGRAM Musepack Filter
Source and decoding filter for Musepack audio.

MONOGRAM AMR Filter
Source, decoding, encoding and muxer for AMR audio.

DC-Bass Source
Source and decoding filter for several audio formats. For example ALAC, AAC, Tracker and TrueAudio.

LAME MP3 binairies
Excellent open source MP3 encoder.

AC-3 ACM Codec
Decompressor for AC3 audio in programs like VirtualDub.

x264 CLI
x264 VFW

DScaler 5
MPEG2/DVD decoder.

ReClock

MediaLooks QuickTime DirectShow filter
A DirectShow filter that works as a wrapper for the QuickTime components. Can be used to play QuickTime files with Windows Media Player.

DC-DSP
Audio processing filter.

Tutorials:

Doom9
Lots of encoding tutorials

DVDR/SVCD/VCD Help
Encoding, converting and burning tutorials specifically for DVDr, SVCD and VCD.

Ripping Tools:

DVDFab Decrypter
DVD Decrypter

Exact Audio Copy

Encoding Tools:

Avidemux
Excellent video conversion tool.

MediaCoder

VirtualDub
Basic video editing and encoding tool.

Auto Gordian Knot

MeGUI

Video Tools:

AviSynth

AsfTools

File Analysis Tools:

GSpot Codec Information Appliance

MediaInfo

MPEG-4 Modifier
Tool for unpacking "packed bitstream" from AVI files.

Audio Tools:

BeSweet
Audio transcoding tool

mpTrim

Muxing Tools:

MKVToolnix

MP4box

Miscellaneous Tools:

ProgDVB

DVD tools:

FixVTS

DVD Rebuilder

DVDSubEdit

IfoEdit

VobBlanker

MenuEdit

Subtitle Tools:

SubRip / VobSubStrip

Players:

Media Player Classic

VideoLAN

BS.Player

ZoomPlayer

MPlayer

Burning Tools:

ImgBurn

Miscellaneous:

Monkey's Audio
Lossless audio compression format.

RareWares
Information about AAC, Ogg Vorbis and MPEG4.

Hydrogen Audio
Audio experts

Official Ogg Vorbis website

Official Matroska website

MSDN DirectShow

FourCC.org
List of common Four Character Codes that are used by codecs to identify themselves.

AudioTag
List of common audio tags used by audio codecs to identify themselves.

Comparison of container formats