Web-based TV production in Los Angeles has surged 353% from 2008 to 2013, according to a report by FilmL.A. Inc., which tracks film permits for the city and county. Web-based shows now account for as many production days in L.A. as sitcoms. Richard Verrier reports on how online video services such as Netflix, Hulu Plus, Crackle, YouTube and Amazon have been investing heavily in original programming to grab some business from traditional networks and cable channels.