This page tries to collect some useful patches for FFmpeg that didn't make into the repository for some reason or another.
native Zlib decoder by Mans Rullgard
WMV3 encoder by Denis Fortin
Apple RPZA encoder by Todd Kirby
PES packetizer by Xiaohui Sun
Part of the work of Summer Of Code TS Muxer
vf_imlib2: a libavfilter filter by Víctor Paesa
"mem" file protocol by Lagrange Multiplier
The "mem" protocol simply uses RAM as a source for input multimedia data, akin to how the "file" and "pipe" protocols use filesystem files and pipes as sources.
Presets/profiles for usual targets by Panagiotis Issaris
Allow to keep in a text file groups of command options, and apply them at once by specifying the target name.
Handy for iPod, PSP, or any other picky multimedia player that otherwise requires lengthy command lines.
H264 encoder by Jori Liesenborgs & Panagiotis Issaris
Chinese AVS video encoder by Stefan Gehrer
Lossless msmpeg4v3 to mpeg4 transcoder
Fixed point cook decoder
GDI screen grabbing for Win32
There are two implementations in the thread above.
MPEG-4 ALS encoder by Justin Ruggles
Chromium security patches
Security/stability patches from Google's web browser http://src.chromium.org/viewvc/chrome/trunk/deps/third_party/ffmpeg/