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4.6 Displaying video and RGB signals
Video and RGB signals can be displayed on an Barco display wall with the optional input cards
Q
A
V
C
, B
UAD
NALOG
IDEO
ARD
the X server the Barco video client xvideo allows the convenient handling of analog video and RGB signals.
Simultaneous operation
Several input cards can be operated simultaneously. In this case, the corresponding video windows may freely
overlap. For large display walls a distributed system with multiple PCI segments may be required.
OmniScaler
Due to the dual color mode capability of the O
mode with 16 bit per pixel while the X X Server operates in 8 bit PseudoColor mode with 256 colors. Please, refer
to section
4.2 Color management
One O
S
provides the capability to process up to 128 video and RGB inputs simultaneously.
MNI
CALER
Video and RGB data is triple buffered. Therefore only entire frames are displayed in sync with the graphical data
to avoid frame tearing.
As the O
S
is used together with graphic with digital output, an A
MNI
CALER
put can not take advantage of the O
Backend scaling
d scaling
The O
S
is able to do a backend scaling. Scaling the video data at the backend of data transfer chain (In-
MNI
CALER
put card -> PCI-Bus -> O
the O
S
provides up-scaling capabilities until full-screen resolution and far beyond.
MNI
CALER
The backend scaling uses linear interpolation for calculating new pixels.
In standard configuration the X server, depending on the size of the video window and the type of the input card
automatically controls the usage of backend scaling.
Dependant on the scaling factor either the O
video or RGB window is larger than 1:1 the O
played in a lower resolution than 1:1, then the input card itself performs a downscaling, to reduce the need of
bandwidth for the data transfer.
In a distributed system the display wall is controlled by multiple OmniBus devices. If a video
shall be displayed on modules belonging to different OmniBus devices, all concerned
OmniBus devices must be supplied with the video signal.
Module video
The Q
A
V
C C
UAD
NALOG
IDEO
and RGB signals respectively without borders and fitted to complete projection modules (1 to n×n, depending on
configuration). The display is always »on top«, other applications are »behind« and can not be manipulated by
accident. If the display is removed from the desktop (quit or iconified) all covered applications show up again
immediately. Module Video is especially helpful if an A
video together with an X server in 8 bit color depth.
Genlock
The A
system provides the ability for genlocking. Either a video of the Q
RGUS
UGX or AGX G
C
RAPHIC
ARD
lock is accessible via the window manager, please refer to section
genlock functionality is explained in section
Barco – Argus X Terminal – DOC-3265-2 – user's manual – Revision 04 – May-2004
GB signals
V
C
, D
RGB I
IG
IDEO
ARD
UAL
multaneously. In this case, the corresponding video windows may freely
MNI
for more details.
S
.
MNI
CALERS
S
) has its big advantage in a reduced need of PCI Bus bandwidth. Furthermore
MNI
CALER
MNI
MNI
, B
V
C
, the D
ARD
IG
IDEO
ARD
or an external studio signal can be used as reference signal. Basic functionality of gen-
4.8.8 Genlock
C
and RGB I
NPUT
ARD
NPUT
S
, A
can display video and RGB signals in RGB color
CALER
RGUS
RGUS
ze of the video window and the type of the input card
S
or the input card scales data. As soon as the size of the
CALER
S
scales data up to the displayed size. If the video is dis-
CALER
RGB I
C
and RGB I
UAL
NPUT
ARD
quit or iconified) all covered applications show up again
with analog output is used, to enable the display of
RGUS
4.5 Window manager
utility.
________________________________________________________________________
C
. Based on an extension library of
ARD
with graphic cards with analog out-
C
can also display videos
NPUT
ARD
A
V
C
, the clock of a
UAD
NALOG
IDEO
ARD
w
manager. Access to the complete
4. Operating
graphical data
4-12
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