App previews
The videos at the start of a product page, checked against Apple's specification.
App previews are videos you record; the tool does not make them, but it checks them and uploads them with the default page.
Put them in store/previews/<locale>/. The readiness checks hold each one to
Apple's specification:
- 886 × 1920 or 1200 × 1600, either way round;
- 15 to 30 seconds;
- at most 30 frames per second and 500 MB;
- at most three per device.
appreview-6.9-886x1920 renders a poster frame, the still shown before the video plays.