title: Speech recognition library for a specific task
body: <p>I want to extract all usages (with some margin of error) of a particular phrase from a set of audio files with total length of approximately 30 hours. I have no experience with speech recognition software, where should I start looking? Language/platform doesn't really matter.</p>
  
  <p>More details. What I want to do is to find all usages of a catchphrase in all episodes of a TV show. So, it doesn't have to be done in realtime and language model probably won't help here.</p>