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