How to add .ass subtitles to an .mkv file

[olavarria]

I want to add .ass subtitles to an .mkv file using a GStreamer pipeline, I'm
trying with this pipeline

gst-launch-1.0 -e filesrc location=video.mkv ! matroskademux ! matroskamux
name=mux ! filesink location=rec.mkv sync=false filesrc location=subs.ass !
application/x-ass ! mux.subtitle_0

But i get this error:

(gst-launch-1.0:6753): GStreamer-CRITICAL **: 10:16:53.422:
gst_segment_to_running_time_full: assertion 'segment->format == format'
failed

And a corrupted output that can't be played.
I have no idea what this can mean, so why is this happening?



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