Converting text subtitles to vobsub

[Michael Lange <klappnase@freenet.de>]

Hi,

is there a program (command line preferred) that is able to convert text
subtitles (.srt or .ass etc.) into vobsub "image" subtitles?
I think there must be something, since dvd authoring programs obviously
can do it, but find it surprisingly hard to find.

ffmpeg apparently fails at this; there is a program called spumux, but so
far as I can see it's not exactly what I am looking for (or maybe I just
don't get how to use it).
Does anyone have another suggestion?

Thanks in advance,

Michael


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