LTW_offset_lower_bound [MPEG-2 Semantics]
The LTW_offset_lower_bound is a 15-bit unsigned integer field in an MPEG-2 multiplex_buffer_utilization_descriptor that is defined only if the bound_data_flag in the descriptor is '1' or 'True'.
signals indicates that the values in the LTW_offset_lower_bound and the LTW_offset_upper_bound fields are valid.
See: multiplex_buffer_utilization_descriptor
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