[MPlayer-users] process an mplayer stream?

[Boycat]

Hi,
If I am playing back a live stream, does anyone know of any good 
utilities that I could pipe the video through feeding it coordinates, or 
something like that, so I can zoom into the playback at specific X/Y 
offsets?

IE: if the video is playing back (mjpeg, 640x480, 24fps) I basically 
want to zoom in on 40,80x60,90 (keeping the aspect ratio of playback 
window) during the playback.

on the 0 to 640 scale, we'd be jumping from 0 to 40, viewing 40 to 80, 
basically discarding 0-40 and 80-640.
on the 0 to 480 side, we'd be jumping from 0 to 60, viewiong 60 to 90, 
discarding 0-60 and 90-480.

So the pixels from 40-80 on the X side and 60-90 on the Y side should be 
"magnified" so as to occupy an entire 640x480 display area... so each 
pixel should be 16 times its original size.

Any hints? Any existing software out there that can do this?

Would mpeg video be easier than mjpeg to manipulate in this fashion, or 
another format for that matter?

Thanks!

-jre