iTunes 12.3.0.44 HD tag for MP4s

The HD tag for videos [ITUNESHDVIDEO 1] no longer works in itunes version 12.3.0.44

Anyone know of a way to fix this?

I have the same problem, anyone can help me? Thanks in advanced.

Could you specify what you mean by having that problem?
e.g. have a look at this thread on a different site:
http://forum.videohelp.com/threads/340675-...v-to-Mp4/page14

that says that you have to use value 1 when the file is 1280x720 and value 2 for files of 1920x1280, (... HD=1, FHD=2)