User manual

17
Image Size, Image Quality, Image Rotation
Image Size: Select the image resolution from the drop-down list. Possible values are: 720x480, 640x480,
720x240, 640x240, 352x240 and 320x240.
Frame Rate: FPS stands for frames per second, or images per second. To conserve bandwidth, you may
lower the overall maximum frame rate of the live video. Select 25/30 for the best possible frame rate.
Image rotation: Flip the image in your Web browser. Note: This setting does not have any effect on videos
transmitted via FTP or E-mail.
VBR - CBR:
With activated MPEG4 compression mode, you can select either VBR mode or CBR mode.
Variable bit rate (VBR)
varies the amount of output data per time segment. VBR allows a higher bit rate (and
therefore more storage space) to be allocated to the more complex segments of media files while less
space is allocated to less complex segments. This means that the video stream size is constantly adjusting
to the video material currently being transmitted. If there is a lot of motion in the video and a lot of details,
the bit rate goes up and the frame rate drops. If the image shows little motion or areas with little detail (walls,
etc.), the bit rate goes down and the frame rate goes up. VBR produces a better quality-to-space ratio
compared to an equivalent CBR algorithm and is therefore the recommended option.
Constant bit rate (CBR)
means that the rate at which a codec's output data should be consumed is constant.
CBR is useful for streaming multimedia content on limited-capacity channels since it is the maximum bit rate
that matters, not the average, so CBR would be used to take advantage of all of the capacity. CBR would
not be the optimal choice for storage, as it would not allocate enough data for complex sections (resulting in
degraded quality) while wasting data on simple sections.
Image quality (VBR): Select the image quality level of the video output. Select Level 1 for the best possible
quality and Level 28 for the best possible compression at the highest possible frame rate. A good value is
Level 4. It generates a full-motion video (30 fps at highest image resolution) over a 100 Mbps network
connection with a very good image quality. Higher values (Level 3, 2, 1) increase the image quality even
more, but at the cost of frame rate.
Bit rate (CBR): Specify the bit rate. Possible values range from 1 (30 kbps = highest compression, smallest
image frame, highest frame rate) to 130 (3900 kbps = lowest compression, biggest image frame, lowest
frame rate).
Lowest Bit Rate/Quality -> smallest network bandwidth usage
The above image illustrates the effects of lowering the video quality. You have full control over the amount of
bandwidth the camera can use, to the point where it becomes difficult to identify any objects in the image
due to heavy compression damage.