I'm trying to learn about IPTV and I see talk about ''encoders'' everywhere.  There's the Windows encoders and MPEG-2 and MPEG 4 (I see MPEG-4 has 2 or more versions as well. Now, I know that obviously it seems MPEG-4 is better quality than Windows Media, but Windows Media has a higher compression, and uses less bandwidth. My main confusion ...