melt -profile hdv_720_25p \
-track qtext fgcolour=white text="1234567890 1234567890 1234567890 1234567890" size=40 family="Ubuntu" weight=720 out=100 length=100 \
-track colour:red out=125 length=125 \
-track qtext fgcolour=white text="1234567890 1234567890 1234567890 1234567890 1234567890 123456" size=40 family="Ubuntu" weight=720 out=100 length=100 \
-transition composite a_track=1 b_track=0 geometry=0/0:1280x80:100 halign=left \
-transition composite a_track=1 b_track=2 geometry=0/100:1280:80:100 halign=left