The main HD video format supported over DLNA by Sony equipment (up until the 2010 models at least) seems to be AVCHD. This may also be true for other renderers built into other brands of TV (though I believe most others support HD MKVs, and possibly HD MP4s). HD MPEG 2 is also supported, but has enormous file sizes.
AVCHD is, believe it or not, the industry standard for distribution of HD media. It is used both on Blu-ray disks and in DVB-S/T/C 2 broadcasting. It is also used in...