[nubinetwork]

I thought the first scanline was wacky because it's sending one extra pixel than the other ~239 lines...

Side rant, isn't that actually scanline 22? Scanline 21 is off-screen, its where closed captions used to come from...

[mrandish]

It turns out which scanline counts as "first" depends on whether we're talking about SMPTE 170M (analog composite video) or Rec. 601 (digital composite video). Per the specifications, in 170M there are half lines but in Rec 601 there aren't.