cat VTS_04_[1-6].VOB | tcextract -x ps1 -t vob -a 0x20 > de
subtitle2vobsub -i VTS_04_0.IFO -p de -o subtitles_de
mkdir images_de
vobsub2pgm -i VTS_04_0.IFO -g 2 subtitles_de images_de/de
pgm2txt images_de/de
srttool -s -w < images_de/de.srtx > de.srt