How to convert .m2ts videos to .h263 format.
Converting Blu-ray BDAV Video Files directly to H.263 Videos (.m2ts to .h263 conversion) is certainly possible, and should be quite straightforward.
You can use one of several video editing programs or conversion tools, such as FFmpeg or Freemake Studio Converter, which are capable of converting .m2ts to .h263.
Program for multimedia streaming and conversion
One of the most popular and successful free video conversion softwares