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If you need to capture full screen video to get the best quality
image, you should use a step capture method—capturing one
frame at a time—and then compress each frame separately
before playback. This will produce a full screen video clip at a
low frame rate. See the documentation supplied with your Video
for Windows capture application for further details on
compressing video clips.
If you require full motion video, however, you should use the
Captivator Pro/TV capture driver to capture live video at a
smaller size—such as 160 x 120—at full frame rate, and then use
the acceleration and SmoothScale features on VideoLogic's
928Movie or PCI Movie to play the clip at full screen and frame
rate.
Capture performance
The quality of the video clips you capture is dependent on the
type of graphics card you are using and the maximum data rate
of your computer. The faster the graphics card bus, the quicker
the data can be passed across it, and the better the quality of the
movie that you can capture. Therefore to capture the best quality
movies, you should use a PCI Movie or VL bus 928Movie
graphics card in a 486 66 MHz or faster PC with a minimum of
8 MB of RAM.
Managing your hard disk
Do not use DoubleSpace, or a similar application, to compress
video data on your hard disk. DoubleSpace uses a considerable
amount of processor time to compress and decompress the data.
This results in a significant drop in the data rate that your PC can
maintain. If the data rate is low, your application will have to
drop frames as it is recording to keep up with the video source,
or you will have to record the clip at a smaller size or lower
frame rate.
We recommend that you defragment your hard disk before you
capture video clips, and at regular intervals afterwards, using the
Defrag command if you are running DOS 6.0 or later, or a disk
defragmenter such as Speed Disk from the Norton Utilities.
Defragmenting your disk improves the data rate of your
computer.
30 Captivator Pro & Captivator ProTV User Guide
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