FirstVu™ HD Operation Guide 860-00177-00
REV D
Digital Ally, Inc. | Device Configuration - VuVault
3-3
Settings
Pre
‐
Event
Time
The Pre-Event Time option allows you to set the amount of time for the pre-
event buffer. The FirstVu HD will buffer the last 0-60 seconds of audio and
video so it can be recorded during a record event. If set for 0 seconds, pre-
event function will be disabled.
Settings:
0-60
seconds
[default
=
0
seconds]
Record
Quality
The Record Quality parameter allows the video compression bit rate to be
adjusted. Digital video is compressed by taking out data that remains
constant from each frame, and only storing data that actually changes. This
allows videos with still backgrounds to be much smaller than they would be
if the background had to be present in every single frame.
The
bit rate
is the amount of bits that can be used in one second of video.
The higher the
record quality
, the higher the bit rate and the size of the
event files. The default setting is “
high”
for excellent video quality, and can
be lowered or raised to adjust the bit rate and storage space. (
VuVault 4.2
Update 2
or newer is required for the
super high
setting).
Settings:
Standard
(2Mbps),
Medium
(4Mbps),
High
(6Mbps)
[default],
Super
High
(12Mbps)
Record
Size
The Record Size parameter allows the video image size to be adjusted from
VGA (standard definition) to 720p (high definition). VGA has a picture size
of 640x480 pixels, whereas 720p has a picture size of 1280x720 pixels.
720p will provide a larger & more defined video picture, but because of its
larger size, will require about 3 times as much storage space as VGA. Also,
the shape of the final video frame will be slightly different, with 720p being a
longer and thinner frame (higher width ratio to height).
Settings:
VGA
(640x480),
and
720p
(1280x720)
[default
Audio
Mode
The audio mode determines how audio will be recorded to your device. If
enabled, audio information is recorded during the recorded event and
during the configured
pre-event time
.
If enabled (w/o Pre-event), audio will be recorded during the event but not
recorded during pre-event. If this option is disabled, no audio will be
recorded.
If the
Pre-Event Time
is set for 0, there cannot be pre-event audio.
Settings:
Enabled,
Disabled,
Enabled
(w/o
Pre-Event)
[default]
Frames
Per
Second
This parameter sets the number of frames per second the FirstVu HD will
record. The higher the setting, the better the video quality, and the larger
the size of the event files.
Settings:
5,
10,
15,
30fps
[default
=
30fps]
