Heartbeat
The lecturesight-heartbeat bundle provides the Heartbeat service.
It is responsible for controlling the execution of the video analysis
services. It listens for several OpenCL service signals that indicate
that all services have finished their work for the current frame and
kicks off the analysis of the next frame.
Configuration
| Key |
Default |
Description |
|---|
| cv.lecturesight.heartbeat.aut
ostart |
2500 |
Delay time in ms after startup
before enabling tracking and
camera control. Set to -1 to make
LS wait for ‘ls:run’ command in
the console before tracking. |
| cv.lecturesight.heartbeat.lis
tens.to |
VA_DONE |
A comma-separated list of signal
name the Heartbeat service waits
for before kicking off the
processing of the next frame. Do
not change this property. |
Console Commands
| Command |
Description |
|---|
| ls:run |
Activate the
video analysis
subsystem. |
| ls:step [frames] |
Run the video
analysis
subsystem run
for the given
number of
frames. If the
argument is
omitted, the
video analysis
is run for 1
frame. This
command is
especially
useful for
debugging when
working with a
video file frame
source instead
of a live video
input. |
| ls:pause |
Pause the video
analysis service
without
de-initializing
the service. |
| ls:restart |
Re-initializes
the heart beat
service and
start the video
analysis
subsystem. This
command might be
used when the
listens.to
property was
changed since
the internal
signal barrier
will be newly
setup up. |
| ls:stop |
Stops the video
analysis
subsystem and
de-initializes
the heartbeat
service. |
