It was working OK on porteus 3.1 kde4 and 3.2.2 MATE caja showing video thumbs "out of box"
but i like to try the new kde5.
i managed to make an ffmpegthumbs-16.12.1-1-i686.xzm
with the help of xz2txz and txz2xzm
and it really added the correct option for video file on dolphin settings
control >> configure >> general >> previews
but no avail

any one can help with that matter?