I had download some video files from the internet. The format is .mkv. When i play those file it showing titles and subtitles while playing. How can i remove those subtitles from the files. If I try to edit would it will affect the audio and video streaming quality of the files. Those subtitles are shown up in all the players i using. Well, i want to make a cd out those file and don't want those subtitles in the videos.