Timing theatrical subtitles?

Hello.


I am currently working with a DVD release of a film that lacks English subtitles. To my knowledge the only available releases with English subtitles were an old laserdisc and a vcd. I have a transcript of these subtitles. Presumably these are also the theatrical subs.


If I go to time them in Subtitle Workshop they run in and out of sync. I tried timing them to the Chinese subtitles that were also on the disc but they still run out of sync. Is there something I am missing (I've tried changing the frame rates), or am I going to need to retime them one by one?


Thanks.