For a good subtitle editor check out http://www.aegisub.org - there is a mac version.
Or you could simply adjust the subtitle delay on the fly in VLC player. Check Preferences - Hot Keys and look for "Subtitle delay up" and "Subtitle delay down". In my VLC the keys are "g" and "h".
Or you could simply adjust the subtitle delay on the fly in VLC player. Check Preferences - Hot Keys and look for "Subtitle delay up" and "Subtitle delay down". In my VLC the keys are "g" and "h".