how to fix mirror image writing on the screen?

If you use FFDSHOW(and if you don't, use it) u have an option to flip the video. So, install the latest ffdshow version(look it up on google), open your movie and you will see in the right bottom side of your screen near the clock two white F's(FF). Double click on them and select from the right output and there you have the option "flip video".

Alex
February 2007