Sharpness on the account of frame rate

[triplebit]

I use UDP streaming (with a version that is earlyer then the newest) from my web camera using a dos box.
It works fine but since the line is quite bad I need to use low baud rate - around 100 kb/s. This causes quite a poor picture, though the frame rate is much above my needs. My thouts are to reduce the frame rate but to retain sharpness of the outcome.
Is that possible?
If so what are the command/paramters that would support the above conditions?
Regards
Jack