Converting HD File Formats

Hi Maria,

First off, Thank you for assisting us in improving the quality of our videos.  While I consider myself to be ok with technology, I am still a bit clueless with regards to video conversion.  I love getting new gadgets, so with Julianna having this role, I went out and bought a Sony HD Handycam.  The first few uploads had some issues because the format is in m2ts -->  I have no idea what that means, but is that format OK?  I have been uploading 2 versions with each review, the m2ts and then a converted mpeg file. 

Regards
Chris