Currently Being ModeratedNov 6, 2012 4:49 PM (in response to Bansaw)
Here's what the DVDSP manual has to say:
Beware of Similar-Sounding Buttons
The remote controls of most DVD players include stream select buttons labeled Angle, Audio, and Subtitle. These are not the same as the remote control buttons you can assign menus to. These three buttons allow the viewer to directly select the angle, audio, and subtitle stream without going to a menu first.
The Angle, Chapter, Audio, and Subtitle remote control buttons that you can assign menus to are in addition to these three stream select buttons, and are found only on a few remote controls, typically grouped in a “Menus” section of the remote control.
It is important to include alternative methods for viewers to get to these menus. You cannot count on all remote controls to have these buttons.
Hope that helps
Currently Being ModeratedNov 7, 2012 11:26 AM (in response to Bansaw)
"Hardware" would be the closest answer. It would be more accurate to say that the behaviour of the Subtitle button on a remote control is "spec" driven, meaning DVD spec. If I remember correctly, you can expect the Subtitle button to show and hide the current subtitle stream. There's a variable that sets the stream while the title is playing and that's what'll show until the stream is changed. And, changing the stream is typically menu driven (you have a "Setup" menu, right?).
And, as RatVega™ mentioned, there's no guarantee that the DVD remote will even have the button.
While I've never tried it, you could probably code the number buttons to change the variable which would change the subtitle stream; however, the user would have no way of knowing that you've cutomized the title to play in this manner.