Tag GoPro videos with GPS metadata in Photos.app (macOS)

gps_tag.js

// GoPro Hero 5/6 videos have GPS metadata but Photos doesn't recognize them for whatever reason.
// This script loads selected items from Photos, analyzes them with exiftool, and adds back the GPS metadata in a way Photos can understand.
// Run this in Script Editor, Automator or save it as a service. Change the export folder.
// Requires exiftool (https://www.sno.phy.queensu.ca/~phil/exiftool/)

function run() {
	const Photos = new Application("Photos")
	Photos.includeStandardAdditions = true

	const app = Application.currentApplication()
	app.includeStandardAdditions = true;
	
	const selected = Photos.selection()
	
	Photos.export(selected, {to: '/Users/quentin/Downloads/', usingOriginals: true})
	
	for (const item of selected){
		addGPSToMedia(item)		
	}
	console.log(`Processed ${selected.length} videos`)
}

function addGPSToMedia(item) {
	const filename = item.filename()
		
	console.log(`Looking at ${filename}`)
	
	if (item.location()) {
		console.log(`${filename} already has GPS info: ${item.location()}`)
		return
	}

	const lat = app.doShellScript(`export PATH=$PATH:/usr/local/bin/; exiftool -s -s -s -n -GPSLatitude /Users/quentin/Downloads/${filename}`)
	const lon = app.doShellScript(`export PATH=$PATH:/usr/local/bin/; exiftool -s -s -s -n -GPSLongitude /Users/quentin/Downloads/${filename}`)
		
	if (!lat || !lon) {
		console.log(`No GPS info for: ${filename}`)
		return
	}
	item.location = [lat,lon]
	console.log(`${filename} is at ${item.location()}`)
}