How do I convert DVD or sub/idx to text srt subtitles?

download text srt subs for many movies and tv-series from
http://www.subtitlesource.org/
http://www.divxstation.com
http://www.divxsubtitles.net
http://www.opensubtitles.org
http://www.subbiee.com
http://titles.box.sk
http://www.podnapisi.net/
http://www.opensubtitles.org/
http://www.undertexter.se/
http://forum.swesub.nu/
http://subscene.com/
http://www.tvsubtitles.net/
http://www.moviesubtitles.org/
http://www.subbiee.com/
http://www.subtitleseeker.com/
http://www.subtitlesource.org/
http://divxnorway.com/m
http://lx.divxstation.com/
http://subsearch.org/
http://subtitles.shadowork.net
http://subtitlesbox.com/
http://titles.box.sk/
http://titlovi-extra.com/search.php
http://www.all4divx.com/
http://www.allsubs.org/
http://www.anysubs.com/
http://www.divxsubtitles.net/
http://www.divxtitles.com/
http://www.findsubtitles.com/
http://www.free-subtitles.org/
http://www.seriessub.com/
http://www.subcentral.de/
http://www.subdivx.com/
http://www.subs4free.com/
http://www.sub-talk.net/
http://www.sub-titles.net/
http://www.thesubfactory.net/foros/search.php
http://www.tusseries.com/index.php
http://www.u-sub.net/sous-titres/

if you can't find it you must convert manually:

DVD to srt text subtitles:
Use subrip or dvdsubedit. (See guides below)

idx/sub to srt text subtitles:
Use Subtitle Edit or subrip or subresync (included in vobsub) or AviDemux(Tools->OCR(sub to srt)).