hi i have a tv episode and the left and right audio channels are backwards, like the left channel is where the right should be and the right channel is where the left should be

in the show the character walks from the right side of the screen to the center and the sound is coming from the left side then ends up at the center, and no my speakers arent connected or placed backwards

is there a simple way to fix this?
i know u can with cool edit but its a pain in the ass and takes too long
is there a program with a function to just re-encode the mpeg stream to make it correct? an invert L/R function or something?
thanx