JVC VN-E4 manual
5-3 Encoding Page, Encode Number, Quality, Frame Rate, Interpolate

Settings (continued)

5-3 Encoding Page

This page is for setting JPEG encoding parameters.

A BC D

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-Bto A7-high-Bis 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-E4is 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-E4is 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.
				When frame rate is increased	When frame rate is decreased
				Frame rate of the distribution remains	Frame rate of the distribution
		Distribution via TCP		unchanged.	decreases accordingly with the new
					settings.
				Frame rate of the distribution	Frame rate of the distribution
		Distribution via Multicast		increases accordingly with the new	decreases accordingly with the new
				settings.	settings.
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.

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