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• AVI
Digital file format developed for Windows
by Microsoft. If a video is recorded in AVI
format (without using codec), the recorded
file size becomes larger because video
compression is not used (if recorded at
320 x 240 resolution, 30 minutes of video
requires about 5GB of space). Advantages
are that files can be processed simply using
editing software, but video and audio timing
may become out of sync if recorded for a
long period of time.
• CBR: Constant Bit Rate (Constant
bitrate)
Videos are usualy recorded at the same
bitrate (amount of data). For this reason,
there may be reduced image quality if
you compare scenes that have a lot of
movement with those that have little
movement. Furthermore, block noise may
also occur in scenes that contain intense
movement because of the lack of bitrate.
• CQ: Constant Quality (Constant quality)
The bitrate is changed automatically to
keep image quality constant. As the bitrate
changes according to the video, the size
of the recorded files will differ greatly
depending on the video being recorded
(videos with lots of movement are larger).
• CVBR: Constrain Variable Bit Rate
(Variable bitrate)
This mode records within a bitrate range
(data size) set prior to recording. Recording
is performed with a higher bitrate when there
is a lot of movement, and a lower bitrate
when there is only a little movement. On
LinkTheater, you can specify the (average)
bitrate and maximum bitrate, and record
using the (average) bitrate value as the
average value.
• MPEG
International standard of animation
compression defined by the Moving Picture
Expert Group (commonly known as MPEG
format forum). MPEG format adopts a
method that compresses the video and
audio data separately, and is the format
used on DVD-Video and Video-CD. There
are a number of formats within MPEG
format, such as [MPEG-1] or [MPEG-2].
Glossary
• MPEG-2
Like MPEG-1, but much better. This is the
format used for DVD-Video.
• WMV
WMV is Microsoft's Windows Media Video
format.
• Codec
Codec is the collective name for coding
and decoding. A codec is a program that
compresses/decompresses video and audio,
and is required for playing/saving video on a
computer. There are many types of codecs,
and different codecs are required for different
video files. If there are no codecs that suit a
particular file on the computer, the video may
not be displayed, or the audio may not be
outputted.
• Bitrate
Rate of data flow for a video file. Higher
bitrates give better quality video, but increase
network traffic and file size.
Mini LinkTheater User's Manual
21
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