I use KM Player, which allows up to 3 subtitles at a time, although the 3rd subtitle is placed right in the middle of the video (the first is on the bottom and

I use KM Player, which allows up to 3 subtitles at a time, although the 3rd subtitle is placed right in the middle of the video (the first is on the bottom and the second is on the top, which works very well).