Reword restriction on `obu_size` about iamf

[sunghee-hwang]

In Propositional Logic, when the conditional statement Clause 1) -> Clause 2) is true, it does not mean that the inverse is always true.
I mean what the sentences say is that the maximum value of the obu_size is limited to 2^21-4 as long as the size of an OBU is limited to 2MB but they say nothing about the inverse.

[felicialim]

Would it help to add a clarification that Clause 2 holds if it is not written with padded bytes?

[jwcullen]

mean what the sentences say is that the maximum value of the obu_size is limited to 2^21-4 as long as the size of an OBU is limited to 2MB but they say nothing about the inverse.

I agree. The statement spec is logically correct/consistent. Just worded in a way that can be slightly misleading. I think this is strictly an editorial problem.

Would it help to add a clarification that Clause 2 holds if it is not written with padded bytes?

Yes. I think this would make it clearer.