SCTE 35 Part 1
splice_immediate_flag
splice_insert
When true, there is no splice_time and the splicer acts at the nearest opportunity in Splice Immediate Mode. When false, an explicit splice_time is present.
splice_insert
When true, there is no splice_time and the splicer acts at the nearest opportunity in Splice Immediate Mode. When false, an explicit splice_time is present.