CHAPTER 10: DEMOD & MUX SETTINGS TAB
10-6
DigiVu
®
Series Multichannel MPEG-2/H.264 Encoder/Multiplexer with QAM &/or IP Output - Installation & Operation Manual
an encoder could exceed the output capability of the used encoder card (for example for SD it’s 8000 kbps). If this happens,
change the bit rate manually to a lower value. This can happen because the algorithm assigns all available bitrate in a QAM,
and if the QAM is ‘empty’ the available bitrate is high.
10.6.1 Program
This is the MPEG program number assigned to the program. This may be changed to any number as required by your system.
If a program is being dropped, the program number assigned to the inserted program is the number of the dropped program.
The program number assigned here will show up in ‘Encoder Settings’ page as greyed out numbers (in appropriate port view).
10.6.2 AV Channel
This is the number of the local encoder port. On the ‘Encoder Settings’ page,in the ‘Ports View’ section, this same encoder is
referred to as a ‘Port Number’. See
“6.5.1 Port Numbering Convention” on page 6-3
for the port numbering. By default this
value is set to ‘None’ which represents the program being dropped from the incoming QAM without replacement
10.6.3 Video Bit Rate
The bit rate assigned to the local encoder after clicking the
Set Bit Rates
button. This value depends on the installed encoder
card. If the bit rate configurator automatically assigns a bit rate that exceeds max allowed bitrate, manually set it to less.
A higher bit rate equates to higher quality video transmission but setting a high bit rate will not improve low quality video
presented to the encoder input.
10.6.4 Audio Bit Rate
This is the bit rate of the audio program. Depending on the encoder card installed, default values will be available to be chosen
as required by your system. Recommended setting is 192 kbps.
10.6.5 AV Channel Bit Rate
This is the aggregate bit rate for the overall program including the individual encoded video and the audio streams.
10.6.6 Total AV Bit Rate (kbps)
This is the aggregate total bit rate of all of the programs added in the ‘Add & Drop Settings’ section. The total includes the video
and the audio encoder bit rates. This value may equal but must not exceed the value of ‘Total Available Bit Rate’ displayed
below the ‘PID Display Tree’ section.
10.7 Add & Drop Settings Buttons
A description of the functionality of the control buttons of the ‘Add & Drop Settings’
feature.
10.7.1 Clear Add & Drop Button
If there are any programs entered into the program list, this button clears all entries. The added programs may also be
removed one at a time by right clicking the programs and select
Remove
when prompted. For programs that are dropped from
the ‘PID Tree’, they may be added once again only from the ‘PID Tree’ section.
10.7.2 Add Button
This enters new programs in the list that have no relationship with the incoming QAM; i.e. are not replacements for dropped
Figure 10-10:
Observe MUX Bitrate
Figure 10-11:
Add & Drop Settings
Buttons
