ViewCast Osprey-300, Руководство пользователя

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Chapter 5: Analog Video Driver Properties
• Select 480-line video for all normal
applications.
• Select 485-line video for specialized
applications.
When 480-line video is selected, you have the
option of treating the Closed Caption line, Line
21, as video or as Closed Caption data. If you
want to capture or display decoded Closed
Captions, you must uncheck the box titled
Include Line 21 in Video. If you are seeing an
unwanted stripe of black and white bands at the
top of your video, you will also want to uncheck
this box. With this box unchecked, the start and
end of the 480-line range of captured video are
both bumped down by two lines.
The checkbox titled Include Line 22 in Video
controls whether Line 22 is captured and
displayed. Some broadcast material encodes
data in this line. This checkbox removes that
data from your video; however, the driver
currently does not support decoding of this data.
Reference Size for Crop and Logo Placement
This part of the dialog is read-only because you
do not set it directly – rather, it shows the results
of settings made elsewhere in the dialog.
The settings shown by the 525-line / 625-line
buttons reflects the video standard selected in
the Input or Video Decoder tab. NTSC and PAL-
M formats result in 525-line, 29.97 frame per
second video. PAL (other than –M) and SECAM
formats result in 625-line, 25 frame per second
video.
The Height and Width boxes show the reference
size of the incoming video based on all the
settings you have made.
Refer to Video Driver Topics, Video Standards
and Sizes, for more information on how the
reference size is determined.