In HEIF, or generally any ISO-BMFF file, does any know how to use pitm box in root meta box to parse the main image?
For example, the documents say the ID of the main image is stored in the pitm box, but when I obtain that ID and find the appropriate one in iloc box, it did not point to a valid offset and length.
Or should I search for other boxes for where to find the main image's media stream? Does anyone know what I've done incorrectly?