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