I was searching about how to convert MKV to another format so i could edit it on Vegas Pro 12... But now i'm stuck on AvsPmod. I wanna treat my image and get rid of some artifacts that appear but i don't know the command for that... They look like big pixels with many colors, some times almost half of the image is with the wrong color and I really don't know what to do with them. Any help?

Oh! And just to be sure. After a treat my image with AvsPmod i'm gonna use VirtualDub to convert to AVI...