Right now I'm ripping my blu-ray discs as m2ts files and playing them back in gb-pvr. However, some of my movies are foreign films and I need to use the subtitles; unfortunately, gb-pvr does not automatically play back my m2ts files with them. Is there a way to automatically read subtitles in m2ts files (either by "forcing" them in the m2ts file or having gb-pvr automatically use any subtitles it finds)?