Optelecom-nkf Siqura C-54 E-MC User Manual page 45

Using the internal web pages
Note on encoder settings: Video bit rate mode can be set to be constant (i.e. the number of bits in a
group of pictures) or variable. Selecting the correct mode for a given application, with emphasis on a
good compromise between detail and good representation of frequent changes (motion), is generally
vital.
Constant bit rate mode (CBR) is generally safest: although the image quality may vary, the network load
generated will remain fairly constant.
If constant picture quality is required and a varying network load poses no problems, choose Variable bit
rate mode (VBR). Video streaming is generally smoother under VBR.
Improving video picture quality and video stream quality, in terms of, for example, latency and
smoothness, is subject to trade-offs. Many aspects of picture quality and stream quality are governed by
a series of compression and signal parameters which may work favorably on one aspect while adversely
affecting another. For example, increasing the bit rate generally improves video quality, but puts
additional load on the network. But even for a given bit rate and network performance, video quality and
streaming are influenced by other parameters and aspects. Please consult appropriate literature on
MPEG-2/4 and MJPEG, and application notes for clarification.
If in doubt about the effects of specific encoder settings, you are advised to select the profile offering the
closest match to your required application.
MX Transmitter settings and making video connections
Figure 7.15 MX Transmitter settings, C-54 E.
The destination address can be unicast or multicast (see Appendix 1).
Per stream: set destination IP addresses and port numbers (even), and then enable the
stream. See Appendix 1 for more information on port numbers.
These settings, in combination with decoder settings, can serve to make links. If in an
MPEG-2/4, MJPEG video decoder a source IP address and port number corresponding to a
multicast address have been set, or if it holds the Encoder IP address and the destination
port number, a video link will be established if the stream for that destination is enabled
('Enable' column). Do not forget to . See figure 7.15.
SAVE
If VMD (described in section 7.7.5) is configured and enabled on the codec, Transmitter 3 on
Encoder 2 will be used to transmit video to the browsing PC. The transmitters are
automatically enabled when the VMD tab is opened. The connection is disabled upon leaving
the VMD tab.
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