JVC VN-X235VPU Instruction Manual - Page 27

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(TV) is applicable to VN-V series only. (TX) is applicable to VN-X series only. A Frame Size JPEG B Quality/Size For selecting the frame size of each JPEG or MPEG4 screen to Quad VGA (1280 ‫ ן‬960) (TX), VGA (640 ‫ ן‬480) or QVGA (320 ‫ ן‬240). Select one of the four (TV) or eight (TX) different patterns. (A Page 19) 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 D Bitrate Control E Frame Rate F I Frame Interval G Priority For setting the MPEG4 encoding bit rate. [Setting range: 64 kbps to 8000 kbps] 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. For setting the MPEG4 frame rate. [Setting range: 1 fps, 7.5 fps, 10 fps, 15 fps, 30 fps (TV)] For setting the I-frame interval. MPEG4 starts encoding from the Iframe. 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] 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. 27

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27
(
T
V) is applicable to VN-V series only. (
T
X) 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
µ
960) (
T
X), VGA (640
µ
480) or QVGA (320
µ
240).
Select one of the four (
T
V) or eight (
T
X) different patterns. (
A
Page 19)
JPEG
B
Quality/Size
For specifying the JPEG picture quality (rate control mode) and size
(target file size).
When
A
VFS1
B
to
A
VFS7
B
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
A
AFS
B
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 ]
(
T
X)
[
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
(
T
V)
]
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.