Fill the entire screen at the expense of mild distortion is what I want. I am trying those suggestions. I prefer to fill the screen than to have back border on either sides.

And yes, I am streaming video using kmplayer as frontend, so, they are in the situation as described by Serge, i.e., they are encoded correctly, so they play on the tablet with 4 borders. I would like to get ride the border even at the expense of mild distortion,

Thanks Ace and Serge,

Edit: I am using kmplayer, so I can only modified the config file. I tried

aspect=0
aspect=no
noaspect

and kmplayer will NOT play.

I also tried aspect=15:9 and it has very minimal distortion and looked great, but with all 4 borders. I think I need to add, "mplayer -vf crop=:$((width*9/15)) video.avi" will get what I what, how to add that as an option on the config file.............? TIA,

bun