4 clip3.mpeg in=100 out=299 \
5 -transition luma in=0 out=49 a_track=0 b_track=1 \
6 -transition luma in=150 out=199 a_track=0 b_track=1 reverse=1 \
7 -filter volume in=0 out=49 track=1 gain=0 end=1.0 \
8 -filter volume in=150 out=199 track=1 gain=1.0 end=0 \