All players do that. Additionally, they zoom the output regardless of input.
My advice would be Media Player Classic,
http://sourceforge.net/projects/guliverkli[
^].
But better obtain it from there, better use K-Lite Codec Pack:
http://codecguide.com/[
^]. Why? Because you need the codec anyway. Media is done by codecs, not by the player; and this is the codec pack which will solve nearly all problems.
There are many other opinion about the subject (and even flame wars). I prefer this one because it is
not cool, it is mature, reliable and convenient.
—SA