gpgm2srt is Perl script for the conversion of
graphical DVD subtitles into SRT/SUB text
subtitles. It contains its own OCR (Optical
Character Recognition) algorithm mastering
diacritics and italics, and is equipped with a
graphical interface. It can also manipulate SRT
text subtitles (time corrections and shift, etc.).
It requires the Perl-Tk interpreter, libnetpbm9,
transcode, and optionally other binaries.