How to convert HD .mp4 (H.264/MPEG-4 AVC) to dvd format?

Convert the MP4 AVCHD file to MPEG2 format using Digital Media Converter Pro - http://www.deskshare.com/media-converter.aspx. Then burn the MPEG2 file(s) to a Video DVD using DVD Author Plus - http://www.deskshare.com/dvd-authoring-burning-software.aspx. This will give you a video DVD that should work in any DVD player. When using DVD Author Plus, just add multiple files into the list, they will be burned to a single video DVD that plays without any space between them.