FLAC uses the ID3v2 spec for tagging, but Ogg does not, so MP3TS won't work. In fact, IMHO, this is the one area that Ogg lags in. Its tagging spec is not very complete, in either documentation or number of tags, again, IMHO.

And to respond to other comments, here's my ``why you should care about Ogg Vorbis'' post, and an important follow-up.