Hi Jean,
I'm having the same problem, I've updated the "video clip get length" action from the eco system, and it's still not getting a length.
It was working fine when using "Video Clip" but using a URL is returning 0 on the clip (the clip has loaded and is playing fine).
Edit:
Turns out that "Get video clip length" won't work for URL, and Jean updated the script "Video Player Get Frame Count"
For a URL video clip, to work out the length I did the following: