Terence Devlin:
I used to import my videocam videos to iMovie and my iPhone videos to iPhoto (iPhoto didn't recognize my videocam MOD files). Photos converted my iPhoto library to Photos library and those videos (from iPhoto) maintained their geotag/keywords/dates.
Later I recovered some videos and picture from iPhoto trash and so had to export them and then import them to Photos . I tried also importing them directly from the iPhoto library (through "show package content" option) without exporting them. In both ways I lost keyword/geotags/dates.
I still have to deal with all my iMovie library videos which I would like to import to Photos.
Am I right then if I say that geotags/keywords/dates that iPhoto saves for videos are actually external to the video files themselves, whereas for pictures are inside the files? I don't know why iPhoto/Photos import iPhone videos with their correct dates and geotags and can't do that for videos from other sources.