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Running tvtime and using its command line tool to tell it to take a snapshot at a set interval with crontab, with at, or with while in a BASH script. It will be something like this in crontab
*/1 * * * * tvtime-command SCREENSHOT
It will take a screenshot every minute. With at or using while in a BASH script they will give you intervals in seconds. Do not forget to set the filename so you can easily upload the file. If you do not you will have to do more work.
Using JAVA to refresh the picture is too extreme because you can easily do it with HTML with the meta refresh tag.