Edit media files metadata

Currently in Ubuntu you can change audio files metadata using some applications (I use Rhythmbox), but you cannot change video files metadata, unless you re-encode the complete clip (using for instance ffmpeg).
I think it is still necessary to add the possibility to change video (at first, since this feature is almost completely missing) and audio files directly in the file property box (for instance in Nautilus). At least for media types supported in your own Ubuntu installation.