Best place to store photo\video annotations data

I know how to persist photo\video annotations data\text. The problem is what is the best place to store them?

I can create another column in the database where I store other photo info.

OR

I see some people sto开发者_开发技巧ring them as xml in the JPEG header. Sounds weird but I might be wrong.

Any other option which might be better?

If you have experience with working with image\video annotations, please share your thoughts.

Thanks

EDIT: I use C# .NET 4.0

I use EXIF tags to store some metadata about photos (JPG files) we store from various sensor arrays. Specifically, a proprietary string of data which I place in the User Comment field. You didn't mention a programming language choice, but as an example, I use the ExifUtils library in a C# application.

I cannot comment as to best practices with video annotations.