Osprey-300 Capture Card
Special Registry Settings
A
PPENDIX
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107
The first character in each four-character descriptor
is a hexadecimal number for the color format. The
color format hex numbers that are currently valid
are as follows:
RGB32:
1
RGB24:
2
RGB15:
4
RGB8:
5 (or “Y8”, or Greyscale)
YUY2:
7
UYVY:
8
I420:
B
(11)
YVU9:
C
(12)
The second character in the four-character
descriptor may be either ‘1’ or ‘2’. If ‘2’, the
exposed format is the extended “VIDEO2” format
that includes interlace flags. If ‘1’, the format is
the simpler “VIDEO” format that is used for most
capture tasks. If “VIDEO2” is specified, typically
along with YUY2 format, on a pin that is being
directly rendered to screen, many display adapters
will deinterlace the video. Specify plain “VIDEO”
unless you are sure you want “VIDEO2”. Refer to
Microsoft DirectShow docs for more information.
The third character in the descriptor may be either
‘+’ or ‘-’. ‘+’ means capture or draw the image right
side up, ‘-’ means capture or draw it upside down.
YUV formats should always be ‘+’. RGB formats
should normally by ‘+’ but can be specified as ‘-’ if
a component is making the image upside down.
The fourth character is currently only used as a
visual delimiter. Treat it as reserved and always
make it a space ‘ ‘.
All of the registry variables described here affect all
devices and all capture or preview pins controlled
by the driver. They do not have to be present in
the registry and are not created by the basic driver
install. If they are not present then the driver
will use its internal defaults. These variables are
located in the registry at the highest level of the
driver’s directory twig.
\\HKEY_LOCAL_MACHINE\SYSTEM\
CurrentControlSet\Services\o300avs
Use RegEdit or similar registry editor to add or
modify them at this place. Generally, you will have
to restart the driver to force it to read the new
values – and the most foolproof way to restart the
driver is to restart the system.
With versions 3.1.1 and later of the AVStream
driver you can alter the list of video formats
available on capture and preview pins by editing
the registry. You can also alter the number of
video buffers that are allocated for each capture
pin.
Lists of video formats are represented as string
variables in the registry. They are located at the
highest level of the driver’s directory twig:
These variables affect all devices There are three of
these REG_SZ (string) variables:
• CaptureMap determines what formats are
exposed on capture pins.
• PreviewMap1 determines what formats are
exposed on preview pins when Hardware
Deinterlace is disabled.
• PreviewMap2 determines what formats are
exposed on preview pins when Hardware
Deinterlace is enabled.
The strings are organized as four-character
descriptors. The first descriptor describes the
first format to appear in the list, and so forth.
The strings can in theory each contain up to 24
descriptors, or 96 characters.
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