Operating the Multiplexer using nCompass Control
4.5.5.4
Minimum and Maximum Bit rates
4.5.5.4.1
Minimum Bit rate
Configuring the minimum bit rate too high reduces the available bit rate for other
Components in the group.
4.5.5.4.2
Maximum Bit rate
Configuring the maximum bit rate too low downgrades the video quality.
A video component may be excessively noisy. Under these conditions, the
associated Encoder may attempt to command large bit rates in the group and
compromise the picture quality on other video components. To avoid this situation,
set the maximum bit rate according to
Table 4.7 Bit rate Requirements Relative to Video Resolution
Encoder Resolution (Pixels)
625 Line Mode
525 Line Mode
Max. Bit rate
704 x 576
704 x 480
10.0 Mbps
544 x 576
544 x 480
8.0 Mbps
480 x 576
480 x 480
7.0 Mbps
352 x 576
352 x 480
6.0 Mbps
544 x 288
4.0 Mbps
480 x 288
3.5 Mbps
352 x 288
3.0 Mbps
4.5.5.5
Group Performance
4.5.5.5.1
Defining the Term
The Group Performance provides a performance check on the statistical
multiplexing process. In general, the bigger the Encoder group the more scope for a
better performance figure. A group containing reasonable weighting factors
compared to the group bit rate will also have a better group performance figure.
4.5.5.5.2 Monitoring
Group
Performance
Group Performance can be monitored on the Activity Viewer via nCompass Control
user interface. The Reflex performance screen shows bit rate and quality plots, and
the group performance meter.
4.5.5.6
Grouping of Encoders by Picture Material
If possible, create a group of Encoders carrying a mix of programme types. This is
likely to create the conditions required to achieve an optimal group.
2/1553-FGC 101 1014 Uen B
4-10
Summary of Contents for MX8400
Page 1: ...MX8400 Multiplexer Software Version 5 2 0 and later REFERENCE GUIDE 2 1553 FGC 101 1014 Uen B...
Page 26: ...Installing and Powering Up 2 1553 FGC 101 1014 Uen B 2 4 BLANK...
Page 94: ...Operating the Multiplexer using nCompass Control 2 1553 FGC 101 1014 Uen B 4 18 BLANK...
Page 96: ...Preventive Maintenance and Fault finding 2 1553 FGC 101 1014 Uen B 5 2 BLANK...
Page 146: ...Technical Specification 2 1553 FGC 101 1014 Uen B B 20 BLANK...
Page 148: ...Static Parameters 2 1553 FGC 101 1014 Uen B C 2 BLANK...
Page 186: ...Redundancy Modes 2 1553 FGC 101 1014 Uen B E 2 BLANK...
Page 192: ...IP Protocols 2 1553 FGC 101 1014 Uen B F 2 BLANK...
Page 196: ...IP Protocols 2 1553 FGC 101 1014 Uen B F 6 Figure F 3 Editing Stack Download Ports...
Page 198: ...ProMPEG FEC Support for IP Streaming 2 1553 FGC 101 1014 Uen B G 2 BLANK...
Page 204: ...Setting up the SFN Functionality 2 1553 FGC 101 1014 Uen B H 2 BLANK...
Page 212: ...Setting up the SFN Functionality 2 1553 FGC 101 1014 Uen B H 10 BLANK...
Page 214: ...PSIG Support 2 1553 FGC 101 1014 Uen B I 2 BLANK...
Page 220: ...BISS Support 2 1553 FGC 101 1014 Uen B J 2 BLANK...