I have solved the problem myself. Only question 3 remains:
Is it possible to use the time from the exif data of the JPG pictures?
My solution is below.
set "FONTFILE=courbd.ttf"
set "COLOR=white"
set "BOXCOLOR=black"
set "SIZE=30"
set "POSITION_X=0"
set "POSITION_Y=(h-th)"
set "S=72060" : timestamp of first picture in seconds
set "I=8" : Interval in seconds
drawtext='fontfile=%FONTFILE%:text=%%{eif\:mod((%S%+%I%*n)/3600,24)\:'d'\:2}"\:"%%{eif\:mod((%S%+%I%*n)/60,60)\:'d'\:2}"\:"%%{eif\:mod(%S%+%I%*n,60)\:'d'\:2}:fontcolor=%COLOR%:boxcolor=%BOXCOLOR%:box=1:fontsize=%SIZE%:x=%POSITION_X%:y=%POSITION_Y%'
Michael
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ASTRO ELECTRONIC Dipl.-Ing. Michael Koch
Raabestr. 43 37412 Herzberg
www.astro-electronic.de
Tel. +49 5521 854265 Fax +49 5521 854266
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