Can ffmpeg demux BD subtitles?

[stax76]

I've tried following command line:

D:\Projekte\VS\VB\StaxRip\bin\Apps\ffmpeg\ffmpeg.exe -i D:\Temp\staxrip\syl.mkv -map 0:s:0 -c:s copy -vn -an -y -hide_banner "D:\Temp\staxrip\Neuer Ordner\syl ID20 German.sup"

Which outputs following error:

[NULL @ 00000000035eb900] Unable to find a suitable output format for 'D:\Temp\staxrip\Neuer Ordner\syl ID20 German.sup'
D:\Temp\staxrip\Neuer Ordner\syl ID20 German.sup: Invalid argument

[nevcairiel]

ffmpeg can demux them, but it doesn't have a muxer to write them into .sup format. You could like copy them into another matroska file.

[stax76]

Thanks