| originally written
and mastered by Elissaios K. - Greece 2002 - [email protected] | http://www.elissaios.tk/
Note: Before you continue, make sure you have what is takes to use a computer
and know its
in-depth capability good enough.
Every time you play a video file with windows media player, the player it self
scans the file and see
its format, format
is also known as ALGORITHM, which is the basis of ALL compressed files
images, video, ZIP etc...). ALGORITHM
is an arithmetic procedure, which simply is executed
compress a file (for example ZIP files). The same way is used for multimedia
Each compressed file must have its extractor, or in other words its unique decoder
to resolve the used ALGORITHM
in the specified file (like for example
to open ZIP files you need
WinZip installed in your computer). For video
files, the type of extractor/decoder is called
"codec", where "co" is "compressor" and "dec" decompressor.
"Codecs" can only be executed by media
players like windows media player. They're like *add-ons* for multimedia players,
and once a video
is loaded, the compatible codec is executed to start
and play finally the file.
is a cutting-edge technology video codec made by Jerome Rota "Gej" in
LOS ANGELES at 1999 using the standard ASF (MPEG4, Advanced Streaming
Format) protocol originally made and copyrighted by Microsoft Corp.
Codename "DivX" was meant to be "(D)(I)gital (V)ideo E(X)press" and it
was scheduled to be released in the market for public uses (like DVD and
VCD). But since the illegibility of its usage was extreme huge, the schedule
:::: DIVX FORMAT
DivX format delivers high video quality rates at a very low cost in size (megabytes).
It is well known as
the best compressor around the world and it is already being used by 2-3 million
users all over the world.
While a DVD disc can keep a movie in extreme quality in 4 Gigabytes, DivX can
keep it in a standard
CD-ROM disc (650 megabytes) with quality ratio 7/10 (which means its only 3
points worse in quality while
DVD haves 10).
Its conversion can reach unimaginable time rates in a standard pc PIII 500 with
Lets say you have a movie in 16:9 screen size (wide screen) and its length reaches
2 hours, for 1 CD,
DivX would take about 4-5 hours to encode the movie and for 2 CD about 3-4 hours.
Yeah it would take
less time to encode it in 2 CDs than 1, that's because the codec encodes the
whole file without using
high compression level which gives you high quality results.
:::: DIVX AUDIO
DivX simply uses standard MP3 format. MP3 and DivX format (video/audio) is the
combination for creating high-resolution copies (both video and audio). Of course
you can use whatever
format you wish. Some of them are MP2, WAV, RMA, OGG. Audio in DivX (also in
all formats) is a different
stream than video. A movie generally holds 2 streams, one video and one audio.
Each of them are
completely independent. Its like loading a media player for audio and a different
player for video.
When you change a scene in a movie in time 00:43, then audio skips to 00:43
Lots of people have report problems with audio-video synchronization (like delayed
searching/tracking the movie). This problems lies most in the codecs. Lets say
you use some codec to
encode audio, and after that install a new but different codec than the old,
then the new is used for
playback. That is THE problem; the DECODER is different than the ENCODER, and
the capability is certainly
Of course this is not the main problem while LOTS of other explanations can
While converting a movie, you can use various of encode types to control bitrate.
For example, you can
encode a file and tell the encoder to raise bitrate (quality) only when its
needed (for example when a scene
haves allot of colors, items etc.).
The following are the well known encode types:
:: CBR (Constant
Uses a standard bitrate for all movie frames. Perfect for archive purposes.
:: VBR (Variable
Encoder scans every frame and uses the needed bitrate (from 0) Good for
:: ABR (Average
Same as VBR, but result file size can be estimated more easily while the encoder
uses the given min/max
bitrate (for example min-500 to max-800).
:: SBC (Smart Bitrate
This is a special EXTERNAL encode type used with NANDUB (www.nandub.org). This
can only be done with
DivX 3.11 which is actually 2 codecs, the one is LOW MOTION and the other HIGH
MOTION. NanDub can
switch these codecs and use them properly to accomplish a perfect result in
quality. However SBC is not
as simple as it sounds, since it depends on how you configure its settings (nandub),
and believe me that's
certainly NOT an easy thing to do!
:::: FINAL WORDS
DivX is the most fast, simple, qualified and first of all, its a free encoder.
Free ONLY for personal usage.
To use the codec for commercial purposes you need a license from DivXNetworks,
visit www.divx.com for
:::: Thanks to Deathstar for spell checking: [email protected]