http://media.ccc.de/browse/congress/2014/31c3_-_6554_-_en_-_saal_g_-_201412292200_-_automatically_subtitling_the_c3_-_timobaumann_-_arne_kohn.html

Transcribing a talk comes relatively easy to fast typists, whereas turning a transcript into time-aligned subtitles for a video requires a much larger human effort. In contrast, speech recognition performance (especially for open-source-based solutions), is still poor on open-domain topics, but speech technology is able to align a given text to the corresponding speech with high accuracy. Let's join forces to generate superior subtitling with little effort, and to improve future open-source-based speech recognizers, at the same time!

timobaumann, Arne Köhn