fix a few videos with bad white balance? I have a few video that i made with my olympus though and i made the mistake of not setting my white balance to sunny (or auto)

it was set to incandescent while being outdoor scenes.

now I got a few blueish videos

what is the best way to fix this? 

can it be done with a free / opensource product?
I have used virtualdub with avisynth ColorYUV(autowhite=true)

it seem to have done an "ok" job