MP4 Metadata

Hello,

I have been using iMovie to do some edits on home video. I would like to embed metadata into the file to make them searchable. For example, if the file contained footage of my son's first words or my daughter's first homemade cake in the same MP4 file I could add those tags without having to make the name of the file represent the data it contains.

thanks in advance for your assistance,
mitch