also worth noting, maxcll and maxfall describe the light peak and average light levels of the mastered content.
The ST2084 metadata (i.e. master-display-parameters in x265 speak) describe the characteristics of the mastering display. For example, a 4000 nit Dolby Pulsar is sometimes used for grading content. So you would set the mastering display metadata to describe this. However, the content is most likely not graded up to 4000 nits. Content is quite frequently graded down to 1000 nits or less. THAT is what MaxCLL and MaxFALL describe.
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