Hi Wolverine,
I see that subtitles don't work for you.
The problem is not much people around here use MAC OSX.
Well I think the site Admin does

Maybe he pays you a visit at this topic.
The other problem is that the Moderator Major4 doesn't come here so often since there's not much action.
So if you wait for either of them you'll get help.
BTW while they are out I would give you some advise so that when they show up they can help you easily.
Are you using the GUI for FFMPEG?
If so can you send us a printscreen from the GUI settings you choose to encode with?
If not can you send us the command line arguments you used?
Can you specify a bit more your problem?
Thanks