can't play mp4 on supported mp4 bluray player

[crusty_shane]

I have recently started ripping blurays to avchd, and these play successfully on my lg bluray home theatre, but when I have an mp4 copy of one of my bluray movies, I can't get my bluray player to recognize these files on a disc, even though this player is supposed to play mp4 files. I have tried to burn to disc with udf 2.50 and this doesn't work, even tried to burn just normally with drag and drop. Do these need to be patched or something??
Any help will be appreciated.