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16 MPEG-2 Encoder
Instruction Manual
5.4 "Main > Video" Screen
The "Main > Video" screen (Figure 5.4) is a "user-configurable" screen to select the video encoder parameters for the input
program:
1
Bitrate: must enter the bitrate for the input video. It is recommended to ensure that the sum of the bitrates of the
input videos #1 thru 4 do not exceed "TS Bitrate" selected on the "Main > TS Config" Screen (see
for details).
2
Closed Caption: is the process of passing the EIA-608 Closed Captioning (CC) information and displaying the CC text on
television or other visual display. Possible options are Enabled and Disabled. The factory default value is "Disabled".
Video Filter Level: is a two-dimensional low-pass filter controlling the degree with which the input video is filtered.
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Possible options are: Off (no filtering), On-Level 1, On-Level 2, On-Level 3, and On-Level 4 (highest filtering coefficient).
Level 1 filtering of the video will smoothen the sharp edges of the pixels and produce a softer image. The softer an
image, the less number of bits required to encode the image at the quantizer level.
Video Coding Mode: must select the Video Coding Mode. Possible options are: Frame and Field. The factory default
4
value is Frame.
GOP Size: The length between I-frames is known as the group of pictures (GOP) size. The factory default value is 15
5
i.e. 1 I-frame for every 14 non-I-frames. The range is 1 to 120.
Test Pattern: A user selectable screen pattern when no input is detected. Options are color bars, black, blue or red
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screens.
1
2
3
4
5
6
Figure 5.4 - "Main > Video" Screen
Remember to click on the SAVE button to apply the new values/configurations.
of section 5.7
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