JVC VN-V686U Instructions Manual page 45

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.
[Quality settings:AFS, VFS1 to VFS7 ]
[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 values: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.
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