mkvisr converts your crap to ffv1 mkv specially formulated for mxf-wrapped j2k but should work for lots of stuff examples convert a file python mkvisr.py -i /path/to/file.mxf convert a directory python mkvisr.py -i C:/path/to/lotsOfFiles rename the output to different directory python mkvisr.py -i /path/to/file.mxf -o /path/to/output.mkv for more info see: matroska dev ffv1 dev flac dev LoC sustainability docs