Closed access features of video formats
Access technique DVD Laserdisc Videotape
Region 1 Elsewhere NTSC PAL
Line 21 closed captions Yes N/A Yes Yes No
Line 22 closed captions N/A No No N/A Yes
World System Teletext closed captions N/A No Yes N/A No
Subtitles Yes: From 32 streams Yes: From 32 streams Yes: 16 streams No No
“Subtitles for the deaf and hard-of-hearing” Yes: From 32 streams Yes: From 32 streams No No No
Dubbing Yes: Seven streams (plus main language) Yes: Seven streams (plus main language) Yes, in theory No No

You found this table here: joeclark.org/dvd/dvdtable.html. It is part of Joe Clark’s media-access pages at joeclark.org/access/.