How to have a bouncing effect using MLT framework?

MLT framework has many interesting features .So here is one of the effect in which the video will bounce like a ball..........do have a try and send me your valuable comments

melt clip2.dv -filter watermark:clip1.dv composite.start=10%,10%:20%x20% composite.key[33]=30%,70%:25%x25% composite.key[66]=70%,30%:15%x15% composite.end=70%,70%:20%x20%
composite.out=100 -consumer avformat:mixer.avi fps=30 fullscreen=1 -profile dvd_ntsc



With Regards,
Er. Animesh Nanda
Manusis Technology,Bengaluru,Karnataka.