Cisco D9800 Configuration Manual page 28

Configuring the HD and SD Transcode Settings
Configuring the HD and SD Transcode Settings
Step 1 From the D9800 web GUI, choose Transport Stream > Transcoder Setup. Or, from the Main Menu of the D9800
front panel, choose Setup > Outputs > TS Out > Transcode.
Step 2 Click the Transcoder 1, 2, 3, 4, 5, 6, 7, or 8 Output radio button to select the channel you want to configure, and click
Transcoder Config. Or, from the PE front panel menu, choose the program entry index, as referenced by the DPM.
Step 3
On the web GUI, if the selected channel is set to HD Output, set the following in the HD Settings column. If the selected
channel is set to SD Output, set the following in the SD Settings column.
a) From the HRes drop-down list, or the HD HRes or SD HRes front panel menu, choose the transcode channel HD
or SD horizontal output video resolution. The table below displays the HD settings and resolutions.
HD HRes Setting
Full
3/4
b) From the Bitrate Mode drop-down list, or the HD B/R Mode or SD B/R Mode front panel menu, choose the transcode
channel output bit rate mode (VBR or CBR).
c) In the Rate field for HD Settings, or the HD Bitrate front panel menu, enter the transcode output bit rate when HD
MPEG-4 or AVC to HD MPEG-2 transcoding is selected. The range is from 8 to 25 Mb/s, in 400 b/s increments.
In the Rate field for SD Settings, or the SD Bitrate front panel menu, enter the transcode output bit rate when HD
to SD transcoding is selected as the output channel (2 to 15 Mb/s, in 400 b/s increments).
d) From the GOP Control drop-down list, or the HD GOP Control or SD GOP Control front panel menu, choose
the format when transcoding a Group Of Pictures (GOP). The options are User GOP(MN) or I Frame Sync.
If User GOP is set as the GOP Control, choose the transcode manual GOP format value from the User GOP drop-down
list, or the HD User GOP (M N) or SD User GOP (MN) front panel menu. 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.
e) From the 3:2 Pull Down drop-down list, or HD 3:2 Pulldown or SD 3:2 Pulldown front panel menu, choose to
enable or disable the 3:2 pulldown.
Step 4 If you are configuring SD settings, the following are additional parameters, specific to SD only:
a) From the Output Aspect Ratio drop-down list, or the SD Aspect Ratio front panel menu, choose the aspect ratio
for the SD transcode output channel. The options are 4:3 and 16:9 (wide aspect ratio).
b) From the Aspect Ratio Conversion drop-down list, or the SD AR Conv front panel menu, choose the SD transcode
channel aspect ratio conversion. This is the conversion that the transcoder will perform on the output signal for the
Cisco D9800 Network Transport Receiver Version 3.01 Installation and Configuration Guide
28
Input Resolution
1080i
720p
1080i
720p
Configuring the Transport Stream Information
Output Resolution
1920
1280
1440
960