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DivX Codec 4.12
============================
Version: 4.12
README file updated on: 2001-12-20
(c) Copyright DivXNetworks, Inc. All Rights Reserved.
"DivX" is a trademark of DivXNetworks, Inc.
Table of Contents
-----------------
1. Introduction
2. Installation instructions
3. DivX encoding and decoding
4. Known issues
5. What's new in the DivX codec
Introduction
------------
The DivX(tm) codec v4.12 is the latest and greatest release of DivX,
the best compression technology for high-resolution movies. The DivX
codec (short for COmpression-DECompression) is becoming the standard
for high quality video over IP networks because it hits the sweet spot
between superior visual quality and small file size. With a broadband
connection, you can download a full-length feature film in the time it
takes to have a pizza delivered!
Installation instructions
-------------------------
To install the DivX codec, you should follow the following simple steps:
1. Copy the installer program (DivX412Bundle.exe) to a location on
your hard drive (e.g., C:\temp).
2. Run the installer program by double-clicking on the
deainstaller.exe icon.
3. Follow the instructions of the installer program to install the
DivX Codec.
4. Done! The CODEC should be installed in your Systems directory.
**What files are installed?**: The DivX Codec installer will install the
following files on your system:
* divx.dll (DivX Codec)
* divxdec.ax (DivX Decoder Filter)
* Help.chm (DivX Help File)
* README.txt (This README file.)
* License.txt (License agreement for the CODEC.)
**Uninstalling the DivX Codec**: To remove the DivX Codec from your
system, you should use the "Add/Remove Programs" control panel in
Windows. To this by selecting "Start -> Settings -> Control Panel ->
Add/Remove Programs" from the Windows Start menu. In the listbox that
is presented to you, choose "DivX 4.12 Codec" and click "remove."
DivX encoding and decoding
--------------------------
How do I use this thing? Please refer to the Help File included in
the installer. You can find the help file in Start -> Programs ->
DivX -> DivX Codec -> Help
Known issues
------------
Please send submit all bugs to http://www.divx.com/feedback.
What's new in the DivX(tm) codec
--------------------------------
**Bug Fixes of DivX 4.12:**
* Crash and burn bug on Pentium-IV when encoding in YV12 mode
* Crash and burn bug on buggy VIA motherboards (decoder/encoder)
* Support for future advanced features
**Features of DivX 4.11:**
* Up to 78% times faster encoding performance than previous
versions when using the YUV color coordinate and the Intel P4 Processor.
* Improved decoder performance. Real-Time Decoding at HD resolutions with P4
* Multi-pass encoding and 2 different variable bit rate modes
* Improved visual quality
* Highly scalable codec from 16x16 to 1920x1280 (i.e. HDTV). All even
integer dimensions greater than 4 are acceptable
* Support for popular encoding/editing applications
* Plays all DivX content
**Change Log:**
-- Changes since 4.02 --
* Up to 78% Increased Encoding Performance with Intel P4 processor
* Fixed more problems with decoding 3.x
-- Changes since 4.01 --
* Fixed more problems with decoding 3.x
* Increased Encoding Performance
* New Post-Processing/Deringing Algorithm. Very noticeable improvement in video playback quality.
* Fixed known AMD related bugs.
* Minor MPEG-4 Compliance changes.
-- Changes since 4.0 --
* Fixed more problems with decoding 3.x
* Incompatibility of codec with Vidomi encoder
* Incorrect bitrate achieved during capture in '1-pass' mode
with AVI_IO capture application
* A few bugs in decoder implementation MPEG-2 inverse
quantization ( not really used now, but necessary to claim that
decoder is 100% compliant with MPEG-4 simple profile )
* Slightly improved accuracy of RGB->YUV MMX/SSE conversions
* Increased version number ( 4.0 -> 4.01 )
* Some cleanup in help file, topic 'deinterlacing'
* most important: hopefully fixed problem with some DivX 3.11
clips fading to green between keyframes.
-- Changes since beta 3 --
* Fixed more problems with decoding 3.x
* Removed last SSE instruction from YUY2->YV12 MMX conversion function
* Added sanity checks for log file contents
* DirectShow filter was not applying brightness/contrast/saturation
settings when starting playback
* Reverted DirectShow filter overlay operation to beta2 style due to
reports about decreased performance on some computers
* Fixed few problems in 2-pass VBR ( sorry guys! )
* Fixed memory leak at highest postproc levels
* Fixed bug with coding as 'skipped' macroblocks that differ only in
chrominance
* Fixed buffer overflow in decoder
* Purple areas were appearing sometimes near right edge of picture ( bug
in encoder )
* Added support of log file format version 2 ( should add minimal
ability for external programs to control 2nd pass )
* Encoder assumes that 1 kbps = 1000 bits per second
* Crash with YUY2 output, height=16*x+2, width!=16*x
* More fixes for decoding 3.11 with non-16*x dimensions
-- Changes since beta 2 --
* DivX decoder registered itself for 3.x formats even if user answered
'No' when installing
* Found one more bug in 3.x decoder
* Fixed problem with quality loss when encoding at height not multiple
of 16 and low resolution
* Fixed crash when encoding on Pentium II / Celeron machines (
accidentally introduced in beta 2 )
* Fixed noise problems in playing 3.x content
* More accurate 2-pass VBR
* Rearranged controls in encoder config dialog
-- Changes since beta 1 --
* DivX DirectShow filter was not working on Windows NT 4.0.
* Encoding was broken at very high bitrates. You would receive scrambled
picture if you tried to encode either in quality-based VBR at quality
level >=95% or in two-pass VBR at bitrates roughly higher than
1500-2000 kbps.
* Decoder was crashing in some cases on Pentium II / Celeron machines (
a few SSE instructions were accidentally put into MMX YUV->RGB
conversion routines )
* Decoder was crashing with postproc level 6 or 7 and 16*N < height <=
16*N+8.
* Fixed one obscure DivX 3.x decoder incompatibility issue.
* DivX decoder filter was crashing when used by BSPlayer (
http://bsplayer.cjb.net )
* There was a parameter in encoder settings, which was called
'crispness' in config dialog and 'frame dropping' in help file. It
causes a lot of confusion.
* In the help file, on the page about postprocessing, there was a
duplicating paragraph, written in slightly different ways.
* 'About' dialog box of the codec showed an unreadable character after
the word 'DivX'. On machines with installed Russian it is a 'TM' sign,
but there are lots of machines out there which do not have Russian
fonts :-)
* Added brightness, contrast and saturation sliders.
* Encoder now stores its settings in the registry.
For information about commercial licensing please email licensing@divxnetworks.com