I used CloneBD trial to copy from an hard disk .iso of a Blu-ray movie to an mp4 file using Copy Mode: Files/mp4 Container. Although the audio is in English, I also wanted the English subtitles, so I checked "English" in the subtitles list at the top of the "Selection" screen. The resulting mp4 file seems to have the subtitles hard-burned into the video track. I can't turn them off in a software player. (I could see the subtitles in the preview screen while CloneBD was processing the movie, so I thought it might be permanently burning them into the video, and apparently it did). What I want is to include the subtitles in the copy, but preserve the ability to turn them on or off during playback, when desired, like you can with the original Blu-ray disc. How do I do that? Thanks.