CHAPTER 6: ENCODER SETTINGS TAB - CONFIGURATION
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– DVIS/DVISm - Digital Video Insertion System & Mini Digital Video Insertion System - Installation & Operation Manual
6.8.2 Audio Input:
Selects between input types if more than one is available for the selected card. For the HD encoder the selectable input types
are L/R UB analog audio or S/PDIF. The S/PDIF input supports AC-3 only and PCM is not supported. For the SD encoders
the input type is L/R UB.
6.8.3 Video Input:
Selects between input types if more than one is available for the selected card. For the HD encoder the input types are VGA ,
and Component. For the SD Encoders the input type is Composite.
6.8.4 Audio Sampling Rate:
This value is preset at 48 kHz and is the number of samples per second (in kHz) taken from an analog signal to make a digital
signal.
6.9 Output Parameters
This group of configuration settings affect the video and audio program stream
properties.
6.9.1 Video Codec:
For encoder cards with more than one type of encoding profile, this allows selection of
the required profile. For the HD encoder card the profile types are MPEG-2 and H.264.
For the SD encoders, the profile is MPEG-2 for ATSC and ETSI.
6.9.2 Video Rate: [1000-20000]
FYI
: When the unit is operating in Add & Drop Mode, this setting is
greyed out as it is set in the configuration view
The video program elementary stream bit rate is entered in kbps and must be between
1000 and 8000 for SD programs, between 1000 and 20000 for H.264 HD programs
and between 1000 and 20000 for MPEG-2 HD programs. Increasing the bit rate
increases the resulting picture quality but consumes more bandwidth. The entered
value must be balanced against the number of other programs in the output MUX and the total amount of room within the MUX
for each program.
FYI: Although the HD resolution support is able to be set as low as 1000 kbps, this low bit rate
will not result in suitable quality and is only intended for the SD resolutions that this HD card
supports. Suitable quality for HD programs will be obtained at a bit rate of 6000 kbps or higher.
6.9.3 VBR:
Not functional at this time. Future implementation.
6.9.4 Video Resolution:
Video resolution refers to the number of discrete picture elements (pixels) in each horizontal line and the number of displayed
horizontal lines in the picture. (e.g. 720 pixels per line x 480 lines). The available video resolution settings depend on the type
of encoder installed. Higher picture resolutions require a higher video bit rate for the same picture quality and conversely,
a lower resolution picture can be encoded with a lower bit rate. Depending on the quality required and the resolution of the
source video, such as a lobby camera, lowering the resolution and bit rate may be used and more channels may be added
in available bandwidth. For all SD encoder cards, the Video Resolution setting determines the output resolution, however, for
the HD encoder card (for HD encoding resolutions), the Video Resolution setting must be set to match the input resolution.
FYI: It is important to note that the Video Resolution of the HD encoder card (for HD encoding
resolutions) must be set to match the input source resolution.
6.9.5 Brightness: [0-255]
This dialog allows modification of the video signal to increase or decrease brightness. There are 256 levels available (0-255)
The default value is preset at 138. This setting should not normally require changing.
Figure 6-5:
Output Parameters
