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I would like to know what each metadata track in step 4 is used for and how to configure it. Can we add code to the video we want to edit instead of copying a mov file track to the file we want to edit? I feel more flexible this way. thank you.
Unfortunately, I don't know how to parse the content in the metadata track, but I don't think this is the major problem to generate a smoothly and available livephoto.
If someone want to go deeper, with my expirence (just guessing):
1. Apple wallpaper trim about 40% ~ 50% of the video
2. then try to transform the frame to the cover image (if the contents is very different, set wallpaper as live will fail)
3. the objects in the video can't move too fast (so you cant just accelarate a very long video)
 
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