Subtitle editor for OSX? I have a video in mp4 (MPEG-4) and I would like to add subtitles to it. What tool or application would you recommend to help me write and sync the subtitles with the video?
Never tried this, but is is cross-platform: http://www.aegisub.org/

After i read your comments - IMHO you will need:


Make .srt subtitles in any tools what you can manage to work (timing)
Optionally repair .srt files in any texteditor - skip this if not needed
Test the .srt subtitles with VLC or Quicktime/Perian
If everything is OK - embed subtitles into video with http://code.google.com/p/subler/