Chapter 5 Web GUI Setup and Monitorin g
5 Choose the transcode manual GOP format value from the User GOP drop-down
list. 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 Choose to enable or disable the 3:2 Pulldown.
7 Choose the SD transcode channel output aspect ration from the Output Aspect
Ratio drop-down list. The options are 4:3 and 16:9 (wide aspect ratio). The
default is 4:3. Set it to the corresponding value.
8 From the Aspect Ratio Conversion drop-down list, choose the SD transcode
channel aspect ratio conversion. This is the conversion that the transcoder will
perform on the output signal for the picture to be displayed correctly (that is, to
correspond to the aspect ratio of your TV) on your TV, based on your selection.
The options are: Auto, None, 16:9 L/B (letter box), 4:3 CCO, 14:9, 4:3 P/B (pillar
box), 16:9 SCALE, or Auto AFD (Auto setting using Active Format Descriptor).
The default is set to Auto.
9 Choose the order to output the closed caption packets on the transcoded SD
output from the Closed Caption Packet 1 and Closed Caption Packet 2 drop-
down lists. The options are None, SCTE-20, or CEA 708.
10 Click OK.
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