I tried to add subtitles to a svcd, but when I multiplexed the .mpg file my movie freezes and the sound sometimes disapears. I used winsubmux to create selectable svcd subtitles. Also when I tried to burn the multiplexed file which is incorrect it gave me an error. It said that the file is not a valid svcd format. Are there some things I have to do before multiplexing the file?