User guide

Channel Setup
33
Lecture Recorder x2 User Guide
Table 6 DVI Channel settings
Show time label
If the video needs to be time labeled or timestamped, this
parameter allows how the date and time will be displayed.
Click on Show substitutions and use the Format
substitutions commands to select the desired date and
time format. The commands are described in table 7
below.
If time labeling is not required, leave this field blank.
Frame size
Select a frame size from the drop down list to limit the
width and height of the video image. If the video source is
sending resolutions larger than the resolution limit
configured, the video image will be scaled to the
resolution limit. Limiting the frame resolution can help to
reduce bandwidth usage.
Note that the final frame size can be larger in case the
Picture in Picture layouts are used.
For the Side-by-Side and Video-outside-DVI/VGA modes
the largest height from both resolutions is used. The
resulting width is equal to the total width amount for both
resolutions.
Key frame interval
Controls the number of frames. Key frames define the
starting and ending points of any smooth transition.
Limit frame rate
Enter a value in terms frames per second. This field is
used to set a frame rate that is lower than the maximum
frame rate at which the Lecture Recorder x2 can capture
images. Reducing the frame rate reduces the number of
images being captured by the device. Decreasing the
frame rate can help to reduce bandwidth usage.
Bitrate
Enter a DVI signal bitrate. A lower bitrate produces lower
quality videos and smaller file sizes. A higher bitrate
produces better quality videos and larger file sizes.
Please refer to the following diagrams:
Figure 73 Correlation Between FPS and Bitrate Values at
Resolution 1280x720
Figure 74 Correlation Between FPS and Bitrate Values at
Resolution 1920x1080
Figure 75 Correlation Between FPS and Bitrate Values at
Resolution 640x480
Quality parameter (for
This parameter is similar to Bitrate. Use bigger values to