There is no way how MKV multimedia files could be converted to SSA subtitles. However, you can simply export subtitles from existing MKV files and save them in one of the suitable formats like the SSA.
Convert Matroska multimedia container to SubStation Alpha subtitle data.
We have found 4 software records in our database eligible for .mkv to .ssa file format conversion.
Microsoft Windows software - convert mkv to ssa on Windows
Matroska (mkv) track extraction windows GUI tool for work with mkvtoolnix.
Convert from mkv file
to ssa file
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned mkv to ssa. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
A a set of tools to create, alter, split, join and inspect Matroska files (.mkv), MKVtoolnix offers users everything they need for handling Matroska format.
Apple macOS / Mac OS X software - convert mkv to ssa on OS X
MKVtoolnix for Mac is a video editing suite that allows users to create, alter, split, join and inspect Matroska files (mkv).
Linux/Unix software - convert mkv to ssa on Linux
MKVtoolnix allows users to create, alter, split, join and inspect Matroska files (.mkv, .mk3d etc.)