Just cannot get "hard-subbing"/embedded subtitling to work

[JollyRoger]

Hi there, embedding subtitles is a fairly easy task on the Windows versions of Avidemux but on the Mac, I just can't get it to work: under Snow Leopard or Mavericks and with the nightly build and the main version. Perhaps I'm doing something wrong because this YouTube member is able to do it on their Mac:

https://www.youtube.com/watch?v=8TrpAmVGzkw

The closest I've ever got was with the nightly build, where I was able to at least select the subtitle filter and choose the subtitle file but the text doesn't appear in the filter preview Window or in the processed video. Does this feature no longer work on the Mac OS X versions or have I missed something? Any pointers or advice would be appreciated.

[AQUAR]

I don't own a MAC nor do I run the Snow Leopard OS on my PC.
But I've had this kind of issue before and they related to not having the font files needed by the SSA subtitles filter.

Maybe this is an area that you might want to investigate.