(TV) is applicable to VN-V series only. (TX) is applicable to VN-X series only.

A Frame Size

 

For selecting the frame size of each JPEG or MPEG4 screen to

 

 

 

Quad VGA (1280  960) (TX), VGA (640  480) or QVGA (320  240).

 

 

 

Select one of the four (TV) or eight (TX) different patterns. (A Page 19)

 

 

 

 

 

 

JPEG

 

 

 

 

 

 

 

 

 

B Quality/Size

 

For specifying the JPEG picture quality (rate control mode) and size

 

 

 

(target file size).

 

 

 

When AVFS1B to AVFS7B is selected, the quantization table during

 

 

 

JPEG encoding will be maintained and the file size will increase/

 

 

 

decrease according to the input signals. Typical sizes will be displayed

 

 

 

in the Size field. . When recording JPEG data to a recorder with a

 

 

 

limited storage capacity, note that the maximum recording time may

 

 

 

vary as the file size fluctuates under this setting.

 

 

 

When AAFSB is selected, encoding is performed such that the target

 

 

 

file size is the average size of multiple JPEG images. You can enter the

 

 

 

target size in the Size field.

 

 

 

[Quality field set values: VFS1 to VFS7, AFS]

 

 

 

Memo:

 

 

 

 

 

 

 

 

 

● The picture size can be specified only when the picture quality

 

 

 

value is set to AFS.

 

 

 

[Size setting range in Quad VGA mode:40 KB to 200 KB ](TX)

 

 

 

[Size field setting range for VGA:10 KB to 100 KB ]

 

 

 

[Size field setting range for QVGA:3 KB to 33 KB ]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MPEG4

 

 

 

 

 

 

 

 

 

C Bitrate

 

For setting the MPEG4 encoding bit rate.

 

 

 

[Setting range: 64 kbps to 8000 kbps]

 

 

 

 

 

D Bitrate Control

 

For selecting whether to set the MPEG4 rate control mode to CBR

 

 

 

(Constant Bit Rate) or VBR (Variable Bit Rate).

 

 

 

CBR

: Encoding is performed at a fixed bit rate regardless of the

 

 

 

 

 

condition of the input video signals. Enables easy forecast of

 

 

 

 

 

the bit rate.

 

 

 

VBR

: Changes the bit rate according to the condition of the input

 

 

 

 

 

video signals. Picture quality is stable, but forecast of the bit rate

 

 

 

 

 

is difficult.

 

 

 

 

 

E Frame Rate

 

For setting the MPEG4 frame rate.

 

 

 

[Setting range: 1 fps, 7.5 fps, 10 fps, 15 fps, 30 fps (TV)]

 

 

 

 

 

F I Frame Interval

 

For setting the I-frame interval. MPEG4 starts encoding from the I-

 

 

 

frame. Shortening the interval stabilizes the picture quality even when

 

 

 

there are rapid changes in the video image. However, the picture

 

 

 

quality for images with little change will deteriorate. In addition, when

 

 

 

multicast packet loss occurs, the time interval required to restore the

 

 

 

image is shorter.

 

 

 

[Set values: 15, 30, 45, 60, 75]

 

 

 

 

 

G Priority

 

For selecting whether to assign priority to the frame rate or picture

 

 

 

quality during MPEG4 encoding.

 

 

 

FPS

 

: Assigns priority to frame rate. Select this setting to enable

 

 

 

 

 

smooth monitoring of motion images.

 

 

 

Quality

 

: Assigns priority to picture quality.

 

 

 

 

 

 

 

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