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V-CamShow (free) - Webcam Slide Show and Screen Saver
Version 1.5.2.183 - released 1 November 2012
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  V-CamShow - Frequently Asked Questions:


  1. What is the criteria for a webcam to be considered as inactive?

  2. What will happen if I loose my internet connection? Will V-CamShow think the camera(s) are offline and disable them by mistake or does it see the connection is lost?

  3. Could you please explain how the refresh interval works? Intuitively, I would expect that to say 5 minutes or 1 hour or something, not an actual time setting.

  4. What are the conditions that would cause auto-adjust refresh rate not to work?



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1. What is the criteria for a webcam to be considered as inactive?
Any one of the following:
  1. image file time is same as previous image
  2. image is identical to previous image
  3. image not found
  4. could not connect to server


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2. What will happen if I loose my internet connection? Will V-CamShow think the camera(s) are offline and disable them by mistake or does it see the connection is lost?
There are several points here:
  1. The cameras are automatically disabled ONLY if Auto-adjust option is selected.

  2. If auto-adjust is selected, then it will be disabled only if the specified interval has elapsed.

  3. A loss of internet connection is treated the same as if the cam was inactive, but since this time is likely to be much smaller than the interval specified for above this should not be a major problem.

  4. You can also check disabled cams at regular intervals and automatically re-enable them if they should become active again.


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3. Could you please explain how the refresh interval works? Intuitively, I would expect that to say 5 minutes or 1 hour or something, not an actual time setting.
Yes, and it does say that except that the format is hh:mm:ss. For example, an interval of 90 seconds is the same as 00:01:30.

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4. What are the conditions that would cause auto-adjust refresh rate not to work?
To answer that it is probably best to tell you when it will work. When a file, in this case the webcam image file, is uploaded to the server it is time-stamped by the server. This is the normal operation and if this happens then auto-adjust will work. Conversley, if the file is time-stamped by any other means then auto-adjust may not work.

So what are the circumstances when the file might not be time-stamped by the server? A few possibilites are listed below:
  1. If the file is time-stamped by the webcam software. In this case, a time difference might exist between the server and the client system clocks which will cause auto-adjust not to work properly.

  2. If the time stamp is manually modified for some reasons. This is often the case with some satellite and weather images. For example if the image was snapped at 10:00 GMT, then the image may be time-stamped with 10:05 GMT for identification purposes.

  3. If the image is served by a script. In this case the time-stamp reported will be for the script and not the image.
There may be other reasons but these are the most common ones.

The program also compares the image downloaded with the previous image. This means it is still possible for auto-adjust to function despite the above - it just won't be as accurate.

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