Metadata in video (mp4) files

I just converted 14 years of DV Video-Material to mp4 clips using handbrake and imported the clips in a newly created LR3 catalogue.
So far so good. After tagging the clips with keywords and descriptions I tried to save the metadata into the clips and here the proble starts.
As far as I know mp4 files are capable to carry metadata. When I use itunes or other programs like SimpleMovieX I can save and read metatdata directly from mp4 files. But in LR3 none of this data is displayed when I try to import a mp4 file already containing metadata or when I try to read metadata from an already imported file. It seems like LR3 is solely managing this kind of information in its database and there is no data interchange between the metadata section of the mp4 files and LR3. My expectation was obviously different.
Does anybody made similar experiences?

Chris_Germany wrote:
It seems like LR3 is solely managing this kind of information in its database and there is no data interchange between the metadata section of the mp4 files and LR3.
I think that is correct.

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