I used Adobe Media Encoder to convert some widescreen H.264 video (720p) to DV. I tried converting it to DV Widescreen, and then DV, in a separate file, to see what the difference was.
To my surprise, they looked identical! They were both 720x480, and had slim dark gray bands on the left and right, and thick dark gray bars at the top and bottom.
Isn't there supposed to be a difference between these two formats?
Hmm, I did notice one difference. The thumbnails in Windows Explorer look different. The DV one has black bars at the top and bottom, while the DV Widescreen one is vertically stretched to fit the box.
But when I play them in Windows Media Player, they look identical.
OK, I think I figured it out. The DV Widescreen image is stretched vertically to fit the 720x480 pixel frame, then marked with an "anamorphic widescreen" setting. Windows Media Player knows it needs to squash it vertically on playback.
That does allow me to get a little more information into the frame than regular DV, since it's from an HD source, so I think I'll use the DV Widescreen encoding.
Glad we could help.