convert pgssub to dvdsub

[jack616]

I have an MKV file that contains one video stream, one audio and one subtitle stream
I'm using ffmpeg and trying to convert the subtitle stream from pgssub to dvdsub so my playback device can recognise it.

Can anyone tell me how to convert the subtitles - preferably in one command without extracting them then reading them
back if thats possible but if it has to be so be it.

As things stand I cant get ffmpeg to even recognise the pgssub stream in spite of
ffmpeg -codecs returning Decode compatible for pgssub.
(dvdsub returns decode and encode in my compile)

p.s.
I don't want to burn the subtitles on the video - I want them left in a seperate stream.

[KarMa]

Subtitleedit is pretty good at converting sup files to sub/idx, but you need to extract the sup files. Along with any other subtitle conversion. MKVExtract will do the trick of getting the subtitles out.

I know this is not what you asked for but this is what I do.

[videobruger]

Beside the Subtitle Edit solution: Extract the PGS with gMKVExtractGUI and convert to IDX/SUB with BDSup2Sub.

(PS: And you don't need to extract first to use MKV in SE)

[videobruger]

Never used it but BDSup2Sub can be used as CLI

https://github.com/mjuhasz/BDSup2Sub/wiki/Command-line-Interface

[jack616]

Thanks for the input guys - I'll try the suggestions.

It does seem odd that there isnt something that just does this in a simple manner.