Panasonic WJ-ND400 manual Restrictions when operating MPEG-4 images

Restrictions when operating MPEG-4 images

There are following restrictions when "MPEG-4" is selected for the image 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 displaying live images.

⋅When MPEG-4 live images are displayed (by switching camera channel, etc.)

⋅When MPEG-4 image is enlarged (or when enlarged MPEG-4 image is resized to the original size)

(2)It may take several seconds (*) for refresh interval of MPEG-4 image when displaying images on a 4-screen.

Example: When "3 seconds" is selected for the refresh interval on the camera, MPEG-4 image will be refreshed in 3 seconds intervals.

2.When displaying images sequentially

When "MPEG-4" is selected for the image compression method of the camera selected for a camera channel on the setup menu, the respective 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 playing recorded images

⋅When MPEG-4 recorded images are played (by changing camera channel, etc.)

⋅When MPEG-4 image is enlarged (or when enlarged MPEG-4 image is resized to the original size)

(When operating to zoom in/out a paused MPEG-4 recorded image, image of several seconds later than the displayed image may be enlarged.)

⋅When the [PLAY] button is clicked again while playing MPEG-4 image

⋅When the first frame is displayed by clicking the [NEXT IMAGE] button during pausing

(2)Playback may be performed in several seconds intervals (*) when the following operations are performed while playing MPEG-4 image. Refer to the Operating Instructions (PDF file) for further information.

⋅Reverse playback ([REV PLAY])

⋅Fast playback/fast reverse playback ([FF] / [REW])

⋅Reverse frame playback ([PREV IMAGE])

Example: When "3 seconds" is selected for the refresh interval on the camera, MPEG-4 image will be played in 3 seconds intervals.

(3)When two records are played sequentially, the last few frames of the former record and the first few frames of the next record may be displayed overlapped.

(4)When playing MPEG-4 image by designating time and date, playback may start from a point several seconds before or after the designated time and date or from the first frame of the next record.

4.When recording images

(1)Time and date displayed on the recording event list (actual start time of recordings) may not exactly indicate the actual time of recording trigger (event occurrence time, start time of the schedule recording, etc.), and also the recording duration may be shortened for seconds worth two times of the refresh interval set on the camera.

Example: When the set recording duration and the set refresh interval of the camera are 10 seconds and 1 second respectively

10 - (1 x 2) = 8 (sec)

The minimum actual recording duration is 8 seconds.

(2)When pre-event recording is set to be performed, pre-event recording duration may be longer than the set duration. Example: Depending on the size of the image data, pre-

recording duration may be around 10 seconds even when setting 5 seconds for the pre-event recording duration.

5.When copying images

Copying may start from a point several seconds (*) later than the designated start time when copying MPEG-4 images. To copy the desired images for sure, designate start time several seconds earlier than the time when the desired images are recorded, and set time range for copying longer than the refresh interval set on the camera.

6. When downloading recorded images

Download of recorded images may start from a point several seconds (*) earlier than the designated start time. Set time range for download longer than the refresh interval set on the camera.

7.When transmitting images recorded at an event occurrence to the FTP server

Duration of images to be transmitted to the FTP server, which are recorded at an event occurrence, may not be exactly the same as the duration set for "Duration-Pre" and "Duration-Post". Set "Duration-Pre" and "Duration-Post" longer than the refresh interval set on the camera.

8. Other

MPEG-4 images will not be attached to alarm mails.

Even when images are to be transmitted to the FTP server periodically, MPEG-4 images will not be transmitted.

*Time (seconds) differs depending on the refresh interval set on the camera (0.2 - 5 seconds). To shorten time lag, set the refresh interval on the camera shorter. Refer to the operating instructions of the camera for how to configure the refresh interval.

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