SCTE 104
messageSize
multiple_operation_message · Decimal
The size of the entire multiple_operation_message in bytes, covering the header, the timestamp(), and every operation in the data() loop.
Clause citations
Standards note
A multiple_operation_message begins with a 2-byte Reserved field set to 0xFFFF that precedes messageSize, so messageSize starts at byte offset 2. This differs from single_operation_message, which begins with opID at byte 0.