Then it's going to be quite difficult for me to check what's going on, and what the urls are of the streams
Can you attach mediaportal.log (from a debug run where you select eurosport)?
For a debug-run, go to the mediaportal configuration, select "general" and at the right set "log verbosity" to "debug".
Then start mediaportal, select onlinevideos, select eurosport.
Close mediaportal, goto "C:\ProgramData\Team MediaPortal\MediaPortal" locate mediaportal.log, and attach to your post.