Cisco D9858 Installation And Configuration Manual page 245

Setting
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2 From the Bitrate Mode drop-down list, choose the transcode channel output
bitrate mode. You can select VBR or CBR.
3 In the Rate field, enter the HD rate that sets the transcode channel output bit rate
when HD MPEG-4/AVC to HD MPEG-2 transcoding is selected. The range is
from 10 to 25 Mb/s in 400 b/s increments.
4 Choose the Transcode Group of Pictures (GOP) format from the GOP Control
drop-down list. The options are User Gop (MN) or I Frame Sync.
5 Set the transcode manual GOP format value (User GOP). The transcoder
attempts to reuse information from the encoded bit stream to improve the video
quality of the transcoded stream. Amongst others, if the incoming GOP structure
is similar to that of an MPEG-2, it will reuse the frame allocations from the
incoming stream as long as GOP Control is set to I Frame Sync. If the
downstream transcoder does not support altering GOP structures, set the GOP
Control setting to User GOP (MN). This will also require the setting of the GOP
structure which is given as two numbers, where the first is the length of the GOP
and the second is the number of B-pictures per sub-GOP. The supported GOP
structures are 1.0, 12.2, 15.2, 24.2 and 30.2.
6 Enable or disable the 3:2 Pulldown.
7 Click OK.
If the selected channel is set to SD Output, proceed as follows:
1 In the SD Settings section, select the transcode channel SD horizontal output
video resolution (HRes). The parameters are 352, 480, 528, 544, 704 or 720.
2 Select the transcode channel output Bitrate Mode. You can select VBR or CBR.
3 Set the transcode channel output bit Rate when HD to SD transcoding is selected
for the output channel. You can enter a range from 2 to 15 Mb/s, in 400 b/s
increments.
4 Select the Transcode Group of Pictures (GOP) format under GOP Control. The
options are User Gop (MN) or I Frame Sync.
Description
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Configuring Transport Stream Information
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