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Changing Port Settings
Each video port that i-Catcher Video Server captures from here its own group of settings, that determine how images are captured, and also what form they are presented in when requests through the embedded web server.
This check-box allows you to disable a port completely, i.e. no capturing of that port will occur. This has advantages in different ways for each capture card type. The Euresys cards cause a slight delay when an attempt is made to re-initialise a port that has no video signal on it. This delay may be an unwanted pause in the capture sequence of all the other ports. Disabling the port with no video signal will stop this delay occurring. The ViewCast cards have a design limitation that causes the video circuitry to alter valid video images if an attempt is made to capture from a port with no video signal. This is obviously an undesirable effect, and again, disabling the appropriate port will fix this.
Preview this port in your web browser
You can see how the server output will look with the current port settings by click on this handy hyperlink. Your default browser will open with a page showing the live output of the port you are adjusting. The image on the page will update as fast as your browser can load it.
In processing environments where the CPU has a high load, such as multiple copies of i-Catcher Video Server, other server processes running, i-Catcher Console running concurrently, etc, it may be preferable to reduce CPU usage as much as possible. A way to do this is to stop i-Catcher Video Server from updating the monitoring views when a capture is made. This saves on the processor time needed to redraw the views, especially if you are using all four ports on your capture card.
Another way to save on CPU usage, without compromising the ability to monitor the capturing, is to adjust the maximum monitor update speed. This setting does not effect the speed in which images are served by the embedded web server. Normally this setting is set at 25 (neither the Euresys nor ViewCast cards can capture faster than this), but you can reduce it to save on CPU time, without disabling monitoring completely. The speed is a maximum rating because the speed in which capture is achieved is not constant, so a setting of 25 means that the view will not be updated more than 25 times in one second. The updates will be spread out across one second, so that, for example, a monitor speed of 10 frames per second means that in ideal circumstances (nothing interrupting the capture card or i-Catcher Video Server) the view will update once every 10th of a second.
This setting controls how the served images will appear, and is customised to the capabilities of the capture card you are using. It determines the image size (resolution) and, in the case of the Euresys cards, whether or not an interlaced or non-interlaced format is used. In the largest size (768x576) you can only have an interlaced image. Note that for performance reasons, the image size for the ViewCast cards is fixed at 384x288.
i-Catcher Video Server is as international as your capture card supports, and this option will allow you to select what format to expect the video signal for the port being adjusted to be in. The list of supported formats varies between cards, but typically allows at least PAL and NTSC, and usually SECAM. If a previously used profile has this option set to a format that is no longer available, then a error will occur, and it will be reset to the default of PAL.
i-Catcher Video Server has four sliders that allow you to change the image appearance for each port, by directly controlling the picture adjustment properties of each input. The top three sliders allow you to change the brightness, contrast, and colour (saturation) of the image, and where available, the bottom slider allows you to adjust the hue setting (NTSC inputs only).