Configure video poster

Hi all,
How can I configure a video poster?
I’ve found that there are useful and related stuff un edxval project, and it’s installed in LMS/admin/edxval
But I cannot find out how to use it.

I’m using Hawthorn edX version.

Thanks in advance!
Juan

Having the same question… looks like poster images are only set using the (deactivated in openedX) video pipeline.

Video blocks look pretty dumb without a poster image…