I know its impossible if they coded into picture, but from what i know when i wanted to build in .sub to .avi file i read that there is some way subtitles stored in .avi not being hard coded into video, is there such way and how i extract/remove them is there is?
AVI-Mux GUI can mux certain formats of subs to an avi container. Remuxing with pretty much anything else will remove them.
