XSTE Preview

The mpv file I swiped from Kino export whilst it was in the middle of working (it deletes it after mplex) caused this error from xste: Frames per second error in /video/.vie/project/project.mpv
29.970 is different from 29.970 specified in main form
this will give timing errors

WTF?

Tried SMILutils. This is a tar xf; configure; make; make install type installation. The magic incantation this time is smil2yuv kino.smil -a project.mp2 | yuvscaler -O VCD | mpeg2enc -o project.mpv -f 1. Same error from xste unfortunately.