I have a movie with subtitles in streams, as VLC shows.
There is also a sub file, but ffmpegx does not think it is valid.
How do I get these subtitle tracks in the movie into the ffmpegx output for playing on a dvd player?

I have experimented with each option of subtitle filters, but haven't had a result as yet...

I think this topic isnt really covered in the howtos, which seem to start from you already having the extracted subitle file, unless I have missed something...