About AVI Video Quality
The AVI format is not a standard and it is designed by Microsoft
for use on Windows platforms. AVI does not specify a Video
compression format, but instead specifies methods to utilize
any format. You need to use a CODEC (Coder-Decoder pair)
to store video in AVI files. In #1 DVD Ripper you may select
the video codec for AVI output from a list of available (installed
and compatible with the source video) codecs. Each codec
has it's own settings and quality parameters, and you must
set them from the codec's windows and dialogs. You can reach
to the selected codec's settings window from the Setup button
on the output' setting window (please refer to the Video
Codec setting section in this help for further information.)
Since each codec has a different set of settings, you must
refer to the codec's help system to find out the best settings
for your target quality/filesize.
Since in AVI the video resolution as well as the encoding settings
are set by the user, the output quality may be disappointingly
low if they codec and its settings are not selected carefully.
As a rule lowering the video resolution almost always results
in higher-quality output than leaving the default full-size
When encoding in DivX remember to select the appropriate profile
for the source video. If you are converting at the highest
video resolution, the 'Home Theater' or 'High Def' profiles
must be selected. Also, depending on the type of video (fast
motion, action movie or slow motion movie) you will need to
select the bitrate. Faster-motion video require higher-bitrates,
while slower-motion ones can be encoded in lower bitrates.
But for the highest video resolution, setting the bitrate to
2000 or 2500Kb/s or higher will give good output quality. Also,
remember that setting the 'Performance / Quality' bar toward
the right (slowest) will give better results, especially if
the video resolution is high and/or the bitrate is low. For
the best results please refer to the DivX help files and to
any of the multitude online forums for help.
When encoding in XviD using the default settings, selecting
an appropriate bitrate will usually give very good quality
output, even for high video resolution. Although for best results
an understanding of the different settings is usually necessary.
Please refer to the help files and to any of the multitude
online forums for help.
In all events, when blockiness, or pixerlization is
noticed in the output video, it is usually solved by highering
the bitrate. Regardless of all other settings, the highering
the bitrate will result in higher quality output.
Choose a proper Codec
By far,DivX codec is the most popular codec for encoding
AVI file. Since its inception, DivX has been among
the world's most popular video technologies and has been
downloaded over 200 million times. DivX is helping to redefine
the media experience by enabling anyone to create, share
and play highly-compressed, high-quality video content. DivX
technology now powers an entire ecosystem of interoperable
products and services, from a secure digital video distribution
solution to tens of millions of consumer electronics devices
and popular video software applications. But DivX isn't just
a technology. It's a global community informed by creativity
and passion for all that is possible with digital media,
and that community is growing in strength and number every
We strongly recommend you install Divx codec,download it at http://www.divx.com/divx/windows/
Choose output resolution
The standard resolution for DVD movie is 720 x 480 for NTSC
DVD and 720 x 576 for PAL DVD. If you want to keep video quality
as original DVD you'd better keep original DVD resolution.Select
output resolution at output tag of settings dialog.
However, DVD has a concept of aspect ratio,like 16:9 for wide
screen TV and 4:3 for standard TV but AVI format does not has
such parameter. Aspect ratio effects the final display size
of DVD movie. So if you do not use "Crop" setting to crop
video source some DVD movies will result in black bar in final
DivX video.Please see Crop
source video for details.
Use 2-pass encoding
Using multipass technique when encoding video into another
format means basically that the video encoder analyzes the
video many(mostly 2) times from the beginning to the end before
the actual encoding process. While scanning the file, encoder
writes information about the original video to its own logfile
and uses that log to determine the best possible way to fit
the video within the bitrate limits user has set for the encoding
process -- this is why multi-pass encoding is only used in
VBR encoding (the CBR encoding doesn't offer any flexibility
for the encoder to determine the bitrate for each frame). Best
way to understand why this is used is to think of a movie --
when there are shots that are totally, absolutely black, like
scene changes, normal 1-pass CBR encoding uses the exact same
amount of data to that part as it uses for complex action scene.
But by using VBR and multi-pass, encoder "knows" that this
piece is Ok with lower bitrate and that bitrate can be then
used for more complex scenes, thus creating better quality
for those scenes that require more bitrate.
To use 2-pass encoding please goto output tag of settings
dialog, Check "Enable 2-pass encoding", Click "setup 1st
pass" and select 1st pass as "Multipass 1st pass", Click "Setup
2nd Pass" and select 2nd pass as "Multipass Nth Pass" in the
configuration window of DivX codec. 2-pass encoding
takes double time to encode compare to 1 pass mode but result
in best video quality.
Install DivX codec, select "High Definition Profile" of
DivX Codec, enable 2-pass mode, Crop Video source if needed.
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