How to convert .webm files to .m2ts format.
Converting WebM Videos directly to Blu-ray BDAV Video Files (.webm to .m2ts conversion) is certainly possible and quite straightforward.
Use one of several currently available video editing programs or converters, such as FFmpeg or Freemake Video Converter.
Alternatively, you can try some online conversion tools, which allow users to easily convert .webm to .m2ts.