inigo \
clip3.mpeg in=100 out=299 \
-hide-track \
colour:black out=199 \
-transition \
luma in=0 out=49 a_track=0 b_track=1 reverse=1 \
-transition \
luma in=150 out=199 a_track=0 b_track=1 \
-filter \
volume in=0 out=49 track=0 gain=0 end=1.0 \
-filter \
volume in=150 out=199 track=0 gain=1.0 end=0 \
$*