JVC V685U Instructions - Page 57

I Frame Interval, Bitrate Control

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JPEG B Quality/Size MPEG4 C Bitrate D Bitrate Control E FPS F I Frame Interval G Priority For specifying the rate control mode and target file size for JPEG. 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. Stipulated values 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. [Size field setting range for VGA: 10KB to 100KB (Only when setting AAFSB)] [Size field setting range for QVGA: 3KB to 33KB (Only when setting AAFSB)] For setting the MPEG4 encoding bit rate. [Setting range:64kbps to 8000kbps] 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, 25 fps, 30 fps] 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. [Setting value:30, 60, 90, 120, 150] 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 : Prioritizes image quality. Memo: ● Valid when [Bitrate Control] D is ACBRB. When a very small bit rate is set for the frame rate or frame size, ACBRB or AVBRB will become the lowest images and a difference will appear in the frame rate. AQualityB which skips frames will be able to realize small bit rates better than AFPSB. 57

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57
JPEG
B
Quality/Size
For specifying the rate control mode and target file size for JPEG.
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. Stipulated values 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.
[Size field setting range for VGA: 10KB to 100KB (Only when setting
A
AFS
B
)]
[Size field setting range for QVGA: 3KB to 33KB (Only when setting
A
AFS
B
)]
MPEG4
C
Bitrate
For setting the MPEG4 encoding bit rate.
[Setting range:64kbps to 8000kbps]
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
FPS
For setting the MPEG4 frame rate.
[Setting range:1 fps, 7.5 fps, 10 fps, 15 fps, 25 fps, 30 fps]
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.
[Setting value:30, 60, 90, 120, 150]
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
:
Prioritizes image quality.
Memo
:
●
Valid when [Bitrate Control]
D
is
A
CBR
B
. When a very small bit rate is set
for the frame rate or frame size,
A
CBR
B
or
A
VBR
B
will become the lowest
images and a difference will appear in the frame rate.
A
Quality
B
which
skips frames will be able to realize small bit rates better than
A
FPS
B
.