"The only suggestion I can make there is to complain to whatever company mastered the film onto DVD. They had full control over what was, and what wasn't mastered, and how it would be done."
That would be a waste of time. They probably be more than happy that I cant encode my movie properly. Who would ever actually call the company mastering the DVD to complain. Deaf ears there.
"When I watch a film like that (Sci-Fi) or like the Bourne Identity, where only certain subtitles are displayed in scenes where English is not spoken, I always thought the subs displayed were added to the film stock (and not removeable) and would be mastered that way, also."
"I guess not - DVD mastering seems to be an all-or-nothing for subtitles. If you're ambitious, you cold get a subtitle writing program, write you're own for the segments you want them to appear in, and take a clean, un-subtitled copy of the movie and re-author them in, but that's an awfully long way to go to get around the block."
Not that ambitiuos.
"The only other thing you might try is, if you have a copy of The Hunt For Red October (or know someone who does - the store-bought version, ie.), put DVDFab into Main Movie mode (as I know the film displays subs for the first few minutes of the film), let the disc be scanned, then see what the list of substreams covers... if there are two for English, one small, and one larger, the smaller one may be 'forced' on DVD playback and cover the moments where only Russian is spoken, and the larger file may be the regular, hearing-impaired, all-thru-the-film subs."
I have hunt, and that one seems to have subs as part of the film stock as you said & so does bourne, both of these when encoded I left the english checked and also checked display forced subtitle and they work fine, however title like house of sand & fog show nothing after encoding when the charecters speak iranian. The DVD plays just fine so I wont complain to the mastering company.
I will try encoding to mpv with one of my other encoders to see if I get better results.