[FFmpeg-user] Changing scale of the video

Shiwani Agrawal agrawalshiwani30 at outlook.com
Tue May 26 19:57:36 CEST 2015

Hello , 
I am overlaying two videos and I read in the documentation that on default value of x and y is evaluated for every frame and also the x and y values consists of the overlay_w and overlay_h .
So please help me to figure out how to change the value of w , h after 50 frames for next 100 frames ?
Thanks ,Shiwani 		 	   		  

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