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Argus Encoder Family Version 2.6 API Developer’s Guide
The IBM Video Registry Table
First Active Video
Line
FirstActiveLine
Unsigned char
Possible settings:
20
21
22
Default: 22
This field determines
which line of video
will be the starting
line of each encoded
picture when the Ver-
ticalRes setting is
less than 480 for
NTSC or is less than
608 for PAL.
Only under special
conditions should
you change this
value to anything
other than 22. For
example, if you must
include closed cap-
tioning but cannot
use the VBI-mode
option
and
cannot
allow the encoder to
place the closed-cap-
tion data in the user-
data field, then you
may set the first
video line to 21;
doing so includes
line 21, with its
closed caption data,
among the 480
encoded lines.
IBM Video Registry Table (Continued)
Property
Registry Key
Data Type
Value Set
Comments
Table A-1. IBM Video Registry Table (Continued)