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subp2pgm - convert VobSub DVD subtitles into pgm files and xml description
subp2pgm [-hvf] [-o output] [-s sid] vobsub
subp2pgm converts DVD subtitles from the VobSub format into an intermediate form suitable for OCR extraction. subp2pgm takes two files as input, which should be named <vobsub>.idx and <vobsub>.sub, where vobsub is the basename of the files. subp2pgm outputs one .pgm graphics file for each subtitle image, and a .xml description file with correct timing annotation, where each subtitle entry is replaced by the corresponding graphics file. After OCR conversion, such a file can be transformed into a proper srt file by subptools(1). The options are as follows: -h, --help Display usage and quit. -v, --verbose Increase verbosity level. -f, --forced Extract forced subtitles only. -n, --normalize Normalize the palette. -o, --output output Basename for all pgm output files and the xml description. -s, --sid sid Selects subtitle id from a vobsub file with several subtitle streams. Defaults to 0.
Manual page by Marc Espie, Olivier Rolland