How to resume a download

[Boesj]

Hi guys, how do i resume a download ?
Do i just change the -v in the beginning of the link with -e in the same cmd screen ?
When i tried this i got a error massage saying it's not the right screenframe (or something like that, didn't copy the message).

So lets say my link is:

rtmpdump -v -r "rtmp://stream2.prolibraries.com/play" -a "play" -f "WIN 17,0,0,188" -W "http://www.prolibraries.com/player/flash/player.swf" -p "http://www.prolibraries.com/player/?libname=nscaa&sessionID=777" -y "mp4:/prolibraries/nscaa/9/777/777.mp4" -o "Jason Grubb - Review of World Cup Goalkeepers.flv"

and it stops download do i just change it to:

rtmpdump -e -r "rtmp://stream2.prolibraries.com/play" -a "play" -f "WIN 17,0,0,188" -W "http://www.prolibraries.com/player/flash/player.swf" -p "http://www.prolibraries.com/player/?libname=nscaa&sessionID=777" -y "mp4:/prolibraries/nscaa/9/777/777.mp4" -o "Jason Grubb - Review of World Cup Goalkeepers.flv"

Or do i need to do something else ?