Well, in the 'old days' of Laserdisc, in English movies that have another character language, say Chinese, those subtitles would be hard coded into the main MPEG, especially for widescreen releases, with them being in the black bar beneath the action. I discovered, like you did, that DVD rips would miss these if the uploader forgot to HC the file themselves. Then I started to d/l torrents and the packages you get would many times include more than one type of subtitle. Since, if you've noticed if you play such a dvd at home, the UI would give you a choice of subtitles to run with the movie, this is because the data is spread among several channels. In a torrent package the subtitles would either be a .srt extension, which will run your native language all through the film, or a .sub extension, which will also have a much smaller file size, that would display only when the language spoken changes from yours to a foreign tongue. The preferences would have to be set in both VLC and KMPlayer. I don't recall VLC but KMP allows you to run both in different colours for those that are hearing impaired, or for when audio is not the best, with one in the top black bar and the other on the bottom black bar. Current versions of VLC should also have this feature. IIRC...VLC..[toolbar] Subtitle..add subtitle and sub track. I like the flexibility of KMP, though I stopped d/l ing that at 18.104.22.168 when it became compatible with the new x265 compression format. In the forum, many users were complaining about the 4.x versions being buggy, that was a while ago, it may have been corrected now. Also, you may have to tweek your firewall and OS because the lovely thing likes to call home, so I just block it in my firewall and have done upgrades in the past, the slow way. Those like myself after being displeased with ver.4.x.x have rolled back to the versions we can live with, and I admittedly, have been too busy to go back and check the KMPlayer forum recently. The best place to download it is at Majorgeeks, they screen for viruses. Older versions are at Filehippo. Don't trust the CNET archives, files from there are known to harbour malware.
Thank You to Russtronic™ for my sig!