I do all three steps, but my AVS file is just MPEG2Source("C:/shati/omganepisode.d2v"). I think Telecide and Decimate in combination will reduce your frame rate, which will reduce video quality if you don't need them, but it sounds like you do (they're for interlaced footage, iirc). I am surprised that SPN is interlaced, though. Can you see interlacing or does DGIndex just tell you it's interlaced?