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Settings (continued)
Ⅵ5-3 Encoding Page
This page is for setting JPEG encoding parameters.
This page can be used upon access via AadminB or AoperatorB. Press the AOKB button to enable the new settings upon changing. If
the AOKB button is pressed upon entering an invalid value, a warning message will appear and entry will be denied. Press the
ACancelB button to restore the invalid entry to the current value.
A Encode Number Up to 8 types of encoding are possible using different combinations of the input channel and
frame size. Turn on the check box for items to be used. Deselect unnecessary items to enable
effective allocation of the processing capacity of VN-E4.
B Quality For specifying the rate control mode and target file size.
When A1-high-B to A7-high-B is selected, the quantization table of JPEG encoding is fixed and the
file size will increase/decrease according to the input signals. Default value of each option is
displayed in the target file size. Be careful when recording JPEG data to a recorder with limited
recording capacity, as file sizes may increase or decrease, so the maximum recording time may
be changed (When AAverage File SizeB or AConstant File SizeB is selected, input of target file size
will be enabled.)
WhenAAverage File SizeB is selected, encoding is performed such that average file size of
multiple JPEG images becomes the target file size.
WhenAConstant File SizeB is selected, encoding is performed such that each JPEG file size
becomes the target file size. When AConstant File SizeB is selected, the processing load of
VN-E4 is heavy and the maximum frame rate becomes a quarter of the maximum frame rate in
other rate control modes
C Frame Rate For specifying the number of frames to encode per second. VN-E4 is limited in its processing
capacity and the specified frame rate may not be realized depending on the settings of
AEncode NumberB and AQualityB.
In particular, when AConstant File SizeB is selected or when the target file size is set to a large
value, the upper limit of AFrame RateB will be lowered.
An example of settings for which 120 fps (VN-E4U) or 100 fps (VN-E4E) can be realized is as
follows.
Encoding : 4 VGA set to ON
Quality : AAverage File SizeB selected and set to A24KBB
Frame Rate : A30B(VN-E4U), A25B(VN-E4E)
The unit will function as follows if the frame rate is altered when data distribution is in progress.
D Interpolate When AInterpolateB is off, video frame with 480 horizontal lines is encoded to JPEG. When
AInterpolateB is on, video field with 240 horizontal lines is interpoleted to 480 horizontal lines, and
encoded to JPEG. To get high resolution, AOffB is recommended. To avoid jaggy image caused
by fast moving objects, AOnB is recommended.
A B C D
When frame rate is increased When frame rate is decreased
Distribution via TCP
Frame rate of the distribution remains
unchanged.
Frame rate of the distribution
decreases accordingly with the new
settings.
Distribution via Multicast
Frame rate of the distribution
increases accordingly with the new
settings.
Frame rate of the distribution
decreases accordingly with the new
settings.