I have added the filter to the MPEI installer (0.22).
It's still not a perfect solution, as sometimes MediaPortal freezes when seeking, but at least it shows the duration of the clip. If anyone is looking for a better filter, PowerDVD10 includes a splitter for FLV and does a much better job. So if you have PDVD10 installed, use their filter instead.
Hi.
What is the filename of this splitter?
EDIT:
Have it now.