SCTE metadata type
crc_32:Null<UInt>
cw_index:Null<UInt>
encrypted_packet:Null<UInt>
encryption_algorithm:Null<UInt>
private_indicator:Null<UInt>
protocol_version:Null<UInt>
pts_adjustment:Null<Int>
section_length:Null<UInt>
section_syntax_indicator:Null<UInt>
splice_command:Null<ScteSpliceCommand>
splice_command_length:Null<UInt>
splice_command_type:Int
splice_descriptors:Array<ScteDescriptor>
table_id:Null<UInt>
tier:Null<Int>