Comcast (s CMCSA), the corporate parent of tape-delay network NBC, lost 176,000 basic video subscribers during the second quarter of 2012, but saw 156,000 net new additions to its broadband subscriber base, which now stands at 18.74 million subscribers. During the same quarter in 2011, Comcast added 144,000 broadband subscribers but lost 238,000 video customers. Comcast’s growth in broadband subsc