V.I.O. Stream - Manual (Page 70)

STREAM User Manual
70
The first clip file in the DCIM directory is the segment that precedes the first tag, and the second clip file which
starts 30 seconds later is for the remainder of the video. Notice that there are two tag files. The first time a tag
command is sent it started the storage of the video but did not create a tag clip. The second and third time a
tag command is sent it did create tag clip files and they are associated with the second main clip file. All three
of the tags are recorded in the XML tag file.
Choosing a Record Mode
Clip – Loop and Loop & Forward provide advantages under some circumstances, but generally, recording using
the Clip method is the simplest and most effective approach. Using tags while recording with the Clip method
allows you to identify significant events in the video. These tags or book marks may be used for manual editing
at this time.
For any recording that will last only a few minutes, there is no reason to use any method other than Clip.
Loop & Forward – Loop & Forward allows you to get set recording, but allows you to limit your pre-event
video to just that video prior to the initial tag. It guarantees a minimum amount of pre-event video. This
feature uses the loopforwardtime to determine how much pre-event video to keep.
Loop – Every time you send the tag command through the Web Programmable HTTP/XML interface, you will
end up with a short clip that captures the action near that tag along with the previous loop clip and the
following loop clip if they exist.
Optimizing video quality
Ultimately video quality is in the eye of the beholder. We can measure and adjust clarity, color accuracy, color
depth, white balance, contrast, and all kinds of other things to make the video you take to look as good as
possible to you and your friends. The STREAM includes both automatic controls that ensure high quality video
under a wide variety of shooting conditions and manually adjustable settings for tweaking video quality.
One of the most difficult problems with hands-free POV video is that the scene you’re filming changes
continuously and since you may be busy hanging on and going as fast as you can, the camera needs to take
care of the second to second details.
The STREAM has built-in dynamic exposure control and white balance logic that constantly adjusts, not just
the exposure, but the white balance, contrast level, and color depth as well. Under almost any outdoor
shooting conditions this results in high quality video.
The STREAM adds four settings that give you the optional ability to tweak the frame processing logic to create
an optimal match between prevailing conditions and your preferences for the look of the final video. You can
shoot high quality video all day without ever thinking about these settings, but under certain conditions, using
the video adjustment settings can produce even better results. With just a bit of practice even a novice can
learn when and how to make beneficial adjustments. If you’re familiar with the adjustments available on a
DSLR still camera, you will already know about these settings.
Exposure Zone
The dynamic exposure control logic works by analyzing the light level and other key characteristics of the
image in frames as their captured by the camera head, and then adjusting the exposure level of the
imager in the camera head to compensate for changes in light levels. When you ride from sunlight into
shade, the STREAM will automatically increase the exposure level to compensate.
By default, the dynamic exposure control logic looks at all the pixels in the frame, which is referred to as
full-frame exposure zone.
Full frame exposure zone is generally the best overall strategy, but under some shooting conditions this
approach requires possibly undesirable compromises because different areas of the scene may have
significantly differing lighting. The solution to this is to measure the light level on just the area of greatest