You can convert MKV3D videos to MKV using MKVtoolnix program. The resulting format will however loose the 3D stereoscopic aspect.
Convert Matroska 3D video format file to Matroska multimedia container.
We have found 3 software records in our database eligible for .mkv3d to .mkv file format conversion.
Microsoft Windows software - convert mkv3d to mkv on Windows
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.
Convert from mkv3d file
to mkv 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 mkv3d to mkv. 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.
Apple macOS / Mac OS X software - convert mkv3d to mkv 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 mkv3d to mkv on Linux
MKVtoolnix allows users to create, alter, split, join and inspect Matroska files (.mkv, .mk3d etc.)