In iPhoto, convert MJPEG videos to H.264?

In iPhoto, convert MJPEG videos to H.264?

In iPhoto, I've got some old MJPEG videos that don't transfer to my iPod
Touch. I've got new videos that I took with my iPod Touch that are in the
H.264 format, so they transfer fine, of course.
How can I convert my MJPEG videos so that I can transfer them to my iPod?
I assume I'd need to convert them to H.264 somehow. Is it possible to
convert them, and keep the metadata associated with them as well,
especially the date that the videos were taken?