When doing a timelapse, the annotation only shows the initial timestamp, not the current timestamp of each frame - which makes imho no sense? Am I doing something wrong? Is there any quick workaround?
raspistill -o /home/pi/sync/test/image_%04d.jpg --nopreview -tl 1000 -t 0 -a 12
raspistill
you can always use your own script to invoke it to take one image at any given time with a filename of your choosing. Essentially like this (shown under "Bash script") thus getting the timestamp you'd like.