As I could not visit the HamRadio this year I took various chances to see whats going on down there. I kept an eye on APRS to see what the visitors are doing. To visualize this a bit I created a little script that compiles a movie from screenshots taken every minute. The screenshots are taken from the Gnome Desktop showing the FireFox browser with the aprs.fi page from the location. A cronjob executes the binary scrot for taking the screenshot every minute. The result looks like this:
The cronjob could look as this:
The scrot.sh script contains some code to save the screenshot with date and time as filename. That makes sorting unnecessary afterwards. The content is:
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I used avconv to make a little movie from the single screenshots. I just plays the pictures in a row with 30 frames per second (default). To visualize the time I added some imagemagick magic to print time and date into the pictures. All that is done using this script:
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The result is a movie showing the APRS activities during the HamRadio 2016 in Friedrichshafen. I uploaded four videos to YouTube, one for each day of the trade fair plus one day of travelling before. Ax example can be found under .