I’m reading the book “Mastering Internet Video” by Damien Stolarz. There is a table which lists 480/60i twice; once as NTSC broadast and again as NTSC DVD. Is that a typo?
No. NTSC is 480i, no matter what the source is.
The standard NTSC DVD frame sizes are 720x480 and 704x480. I think the latter is used for digital broadcasts, like DirecTV. DVD also allows a couple other frame sizes: 352x480 (“half D1”) and 352x240 (“SIF”).
I thought the “xxx” in xxx/60i referred to the horizontal resolution.
480 is vertical resolution. 60 is framerate. i is interlaced.
If it was progressive, it would be 480/30p (I think).