How to add .ass subtitles to an .mkv file running stream

[olavarria]

I want to add subtitles to a running .mkv file stream. I tried this:

gst-launch-1.0 filesrc location=subs.ass ! ssaparse ! overlay. \
filesrc location=video.mkv ! matroskademux name=demux \
demux. ! queue ! decodebin ! videoconvert ! subtitleoverlay name=overlay !
autovideosink

But i'm getting this error: *Only SSA subtitles embedded in containers are
supported*

I'm sure that error means that i need an .mkv file with subs to use
ssaparse, but that isn't what i need.
It is possible to do this with other plugin or other solution?





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