JVC VN-E4U Instruction Manual - Page 24

Settings (continued) Ⅵ5-3 Encoding Page This page is for setting JPEG encoding parameters. A B C 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 B Quality C Frame Rate 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. 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 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. Distribution via TCP Distribution via Multicast When frame rate is increased Frame rate of the distribution remains unchanged. Frame rate of the distribution increases accordingly with the new settings. When frame rate is decreased Frame rate of the distribution decreases accordingly with the new settings. Frame rate of the distribution decreases accordingly with the new 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. 24