automatic playback at half width and hieght?

[DreamCoDec]

okay, here's my question

Is it possible to tweak an existing mpeg file (or any video file) so that it automaticly plays back (on a computer) at half its actual width and height?

i'm asking because i've noticed that more quality is preserved when encoding files with lower bitrates at larger resolutions when you play them back at half thier size

[Tony D]

Freeware multimedia player Irfanview has the option to play video at 1/2 size by default.

Http://www.irfanview.com

[DreamCoDec]

no, i asked if a file can be tweaked so that it will play that way in any player, without anything needed to be done by the user.