Please add VobSub2SRT to portage. VobSub2SRT is a simple command line program to convert .idx / .sub subtitles into .srt text subtitles by using OCR. It is based on code from the MPlayer project - a really really great movie player. Some minor parts are copied from ffmpeg/avutil headers. Tesseract is used as OCR software. There is an ebuild[1] available in the git repository. [1] https://github.com/ruediger/VobSub2SRT/blob/master/packaging/vobsub2srt-9999.ebuild
Ebuild available in my overlay: https://github.com/stefantalpalaru/gentoo-overlay