Panasonic WJND400 - NETWORK DISK RECORDER Operating Instructions Manual

Also see for WJ-ND400/1000: Product catalog Reference Manual Specification Quick reference guide

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Panasonic WJND400 - NETWORK DISK RECORDER Operating Instructions Manual Manual pdf 7 page image

7Restrictions when operating MPEG-4 imagesThere are following restrictions when "MPEG-4" is selected for theimage compression method on the setup menu. ("NW camera"under "Camera")1. When displaying live images(1) Black screen may be displayed for the first few seconds (*)when the following operations are performed while displayinglive images.⋅ When MPEG-4 live images are displayed (by switchingcamera channel, etc.)⋅ When MPEG-4 image is enlarged (or when enlargedMPEG-4 image is resized to the original size)(2) It may take several seconds (*) for refresh interval of MPEG-4image when displaying images on a 4-screen.Example: When "3 seconds" is selected for the refreshinterval on the camera, MPEG-4 image will berefreshed in 3 seconds intervals.2. When displaying images sequentiallyWhen "MPEG-4" is selected for the image compression method ofthe camera selected for a camera channel on the setup menu, therespective sequence step will be skipped.3. When playing recorded images(1) Displayed playback time may be fast for several seconds (*)when the following operations are performed while playingrecorded images⋅ When MPEG-4 recorded images are played (by changingcamera channel, etc.)⋅ When MPEG-4 image is enlarged (or when enlargedMPEG-4 image is resized to the original size)(When operating to zoom in/out a paused MPEG-4recorded image, image of several seconds later than thedisplayed image may be enlarged.)⋅ When the [PLAY] button is clicked again while playingMPEG-4 image⋅ When the first frame is displayed by clicking the [NEXTIMAGE] button during pausing(2) Playback may be performed in several seconds intervals (*)when the following operations are performed while playingMPEG-4 image. Refer to page 20 for operations duringplayback.⋅ Reverse playback ([REV PLAY])⋅ Fast playback/fast reverse playback ([FF] / [REW])⋅ Reverse frame playback ([PREV IMAGE])Example: When "3 seconds" is selected for the refreshinterval on the camera, MPEG-4 image will beplayed in 3 seconds intervals.(3) When two records are played sequentially, the last few framesof the former record and the first few frames of the next recordmay be displayed overlapped.(4) When playing MPEG-4 image by designating time and date,playback may start from a point several seconds before orafter the designated time and date or from the first frame ofthe next record.4. When recording images(1) Time and date displayed on the recording event list (actualstart time of recordings) may not exactly indicate the actualtime of recording trigger (event occurrence time, start time ofthe schedule recording, etc.), and also the recording durationmay be shortened for seconds worth two times of the refreshinterval set on the camera.Example: When the set recording duration and the setrefresh interval of the camera are 10 seconds and1 second respectively10 - (1 x 2) = 8 (sec)The minimum actual recording duration is 8seconds.(2) When pre-event recording is set to be performed, pre-eventrecording duration may be longer than the set duration.Example: Depending on the size of the image data, pre-recording duration may be around 10 secondseven when setting 5 seconds for the pre-eventrecording duration.5. When copying imagesCopying may start from a point several seconds (*) later than thedesignated start time when copying MPEG-4 images. To copy thedesired images for sure, designate start time several seconds earlierthan the time when the desired images are recorded, and set timerange for copying longer than the refresh interval set on the camera.6. When downloading recorded imagesDownload of recorded images may start from a point severalseconds (*) earlier than the designated start time. Set time range fordownload longer than the refresh interval set on the camera.7. When transmitting images recorded at an eventoccurrence to the FTP serverDuration of images to be transmitted to the FTP server, which arerecorded at an event occurrence, may not be exactly the same asthe duration set for "Duration-Pre" and "Duration-Post". Set"Duration-Pre" and "Duration-Post" longer than the refresh intervalset on the camera.8. OtherMPEG-4 images will not be attached to alarm mails.Even when images are to be transmitted to the FTP serverperiodically, MPEG-4 images will not be transmitted.* Time (seconds) differs depending on the refresh interval set onthe camera (0.2 - 5 seconds). To shorten time lag, set the refreshinterval on the camera shorter. Refer to the operating instructionsof the camera for how to configure the refresh interval.