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dvdsub to kate subtitle transcoding fails after first subtitle for ogg container

Submitted by Eric

Link to original bug (#740565)

Description

This command goes on showing output for all subtitle entries:
gst-launch-1.0 filesrc location=Arigatou.Death.Note.Ep01.[x264.AAC][558F2901].mkv ! matroskademux ! dvdsubparse ! kateenc category=spu-subtitles ! fakesink silent=false -v

While this one stops immediately:
gst-launch-1.0 filesrc location=Arigatou.Death.Note.Ep01.[x264.AAC][558F2901].mkv ! matroskademux ! dvdsubparse ! kateenc category=spu-subtitles ! oggmux ! fakesink silent=false -v

I can sink the former one into a file, but ogg tools can't merge it with the video. I think because it's not an ogg container itself. I'm guessing it's just a raw byte stream of kate?

When I sink the latter to a file and merge it with video, I get the very first line of subtitle and then nothing else.

Running version: 1.2.4-1~ubuntu1:amd64 on Linux Mint

Version: 1.2.4