bit(6) reserved=0;
unsigned int(2) sample_depends_on;
unsigned int(2) sample_is_depended_on;
unsigned int(2) sample_has_redundancy;
bit(3) sample_padding_value;
bit(1) sample_is_difference_sample;
// i.e. when 1 signals a non-key or non-sync sample
unsigned int(16) sample_degradation_priority;
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