Spyclops SPY-DVR4HYB Instruction Manual page 11

Encode format: For the main stream we recommend NTSC with 960H format
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QCIF
176 x
NTSC
120
176 x
PAL
144
Rate: In general, we recommend a bitrate of around 2 - 2.5 Mbps, which takes into account
•
the average worldwide broadband connections for video output
Quality: You can adjust your image quality fluctuation. Highest, High, Medium, Low, Lowest.
•
Highest is recommended, although it will affect your bandwidth
Frame rate: The frame rate is how many unique consecutive images are displayed per second
•
in the video to give the illusion of movement. Keep in mind, that the minimum limit that our
brain needs to perceive moving frames as a video is 24 Frames per Second, so there is no big
difference between 24 and 30 fps except the higher frame rate will affect your bandwidth and
data storage
960H is a step up from D1 resolution. D1 produces a lower quality image and stretches the
•
image, while 960H is a higher quality image with no image distortion.
Constant Bitrate
Average Bitrate
Variable Bitrate
CIF HD1 WCIF
360 x 352 x 480 x
240 480 240
360 x 352 x 480 x
288 576 288
This is the default encoding mode, and
also the most basic. In this mode, the
bitrate will be the same for the whole file.
It means that each part of your video file
will be using the same number of bits.
The complex parts will be of a lower
quality than the easiest ones. The main
advantage is that the final files size won't
change and can be accurately predicted.
This mode is not recommended
In this mode, you choose a target bitrate
and the encoder will try to constantly
maintain an average bitrate while using
higher bitrates for the parts of your video
that need more bits. The result will be of
higher quality than CBR encoding while
the average file size will remain
predictable, so this mode is highly
recommended over CBR.
In this mode, you choose the desired
quality on a scale going from 9 (lowest
quality/highest distortion) to 0 (highest
quality/lowest distortion). Then you
choose the optimal number of bits to
spend for each part. The advantage is that
you are able to specify the quality level
that you want to reach; the inconvenient
is that the final file size is totally
unpredictable.
D1 720P
960H
720 x 960 x 1280 x
480 480 720
720 x 960 x 1280 x
576 576 720
1080P-
1080P
H
960 x 1920 x
1080 1080
960 x 1920 x
1080 1080
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