I saw the code do ImageGrid::write() but I don't know how to use it. I think this is related with Box_iref, iloc and iinf box.
Is there spec or handbook to do this? I have 23008-12 and 14496-12 spec but don't understand how this works..
Could somebody give me some hint?

And is iref_box can reference to single image encoding, not grid?
How to create a grid HEIF
This is a GitHub Issue
repo:libheif
owner:strukturag
Title : How to create a grid HEIF
Issue date:

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I saw the code do ImageGrid::write() but I don't know how to use it. I think this is related with Box_iref, iloc and iinf box.
Is there spec or handbook to do this? I have 23008-12 and 14496-12 spec but don't understand how this works..
Could somebody give me some hint?

And is iref_box can reference to single image encoding, not grid?
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None