19
Video Input/Output Interface Specifications
The specifications for the video I/O connections are provided below.
Composite Video Output
Output
Connection
Signal Level
Composite video
BNC coax cable
1V p-p into 75 ohms
S-video Output
Pin
Signal
Signal Level
1
Y + Sync
1V p-p into 75 ohms
2
Chroma
1V p-p into 75 ohms
3
Ground
4
Ground
SDI Video Input/Output
Output
Connection
Signal Level
SMPTE 259M video
BNC coax cable
1V p-p into 75 ohms
Real-Time Video Capture
The video data are received from the external video source (SDI Input) as fields of 243
(for 525/59.94 systems) or 288 (for 625/50 systems) visible lines. Input sequences vary
and can be as short as one frame, or as long as disk space and the application software
allows.
You can monitor the video capture process on the Composite, S-video, or SDI outputs.
The video output is line-locked to the input with a fixed delay between input and output.
In capture mode, the video input displays continually regardless of whether video
capture is enabled or disabled.
When video capture is triggered, capture begins with the next odd field of incoming
video. If the video sequence cannot be stored in memory quickly enough to maintain
full frame rates, you may encounter dropped frames. If this happens, StudioZ duplicates
input frames as necessary to produce a seamless video sequence.
