Acquiring and buffering a video signal without additional software

Hi
I have a generic USB capture box to which I am inputting an RCA video signal only (no sound).
Am I able to display the video feed in Labview and continuously buffer 30 seconds of it?
The idea is that when an input trigger fires the buffered video is saved and the live stream continues to save another 30 seconds. Once the trigger has been fired the video does not need to be displayed. When the recording is finished the program continues to monitor and wait for another input.
I have been told that activex will work, but I don't have any idea how to implement it.
I am using Labview 8.0 and as this is at University I don't have access to any labview plugins.
Any help will be very greatly appreciated.
Mike

Hi Mike,
Thanks for using our discussion forums.  In
regards to your USB device, we do offer an NI IMAQ driver for USB which can be
found here http://zone.ni.com/devzone/cda/epd/p/id/5030
.  Though it is not supported by our application
engineers, this will allow you to perform very basic image acquisition with
your camera.   
If you are able to use our Vision products in the future, a
simple way to save a buffered video in LabVIEW is just to build an array of
images until you reach 30 seconds (you can calculate this based on your
frames/sec rate).   In a case structure, we can subset the most
recent items into a sub array and save that to file depending on the data
type.  In regards to triggering, we can
software trigger this configuration using another case structure in the while
loop so that when it fires the “buffered” image video will be saved.  
If you would like to use ActiveX you can learn more about
this application with LabVIEW at our Developer Zone tutorial http://zone.ni.com/devzone/cda/tut/p/id/2983
 .  I hope this gives you a good start.
Regards,
Vu Doan
Applications Engineer
National Instruments

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