Getting Started
3.18 How to Splice and Insert Digital Programme Insertion (DPI)
Splicing is used to insert Digital Programme (DPI), e.g. advertisements, into an
MPEG-2 Transport Stream. DPI is available when the DPI license is purchased.
One licence is required for each video component.
3.18.1 Splice Point Operation
The VCM is capable of storing up to 10 splice events, which can be inserted up to
13 hours before the event is due, but no less than 4 seconds to the splice point. If
splicing is disabled all stored pending splice events will be deleted.
Splice point insertion can be controlled from SCTE104 messages, either in VANC or
from the IP input, or from GPI triggers (see Section 3.19 for GPI details)
Table 3.13 Example Multiple Operation SCTE104 Message Structure
Data Comment
0xFF, 0xFF reserved
0x00, 0x27 message size = 39 bytes
0x00 SCTE-104 protocol version
0xAA AS index
0xBB message number
0x01, 0x01 DPI PID index (slot 1, channel 1)
1
0x00 SCTE-35 protocol version
0x00 timestamp type = zero (no timestamp)
0x02 number operations...(2)
0x01, 0x01 op ID = splice request data
0x00, 0x0E data length = 14 bytes
0x01 splice insert type - splice start normal
0x12, 0x34, 0x56, 0x78 splice event ID
0x66, 0x99 unique program ID
0x0F, 0xA0 pre-roll time = 4000ms
0x00, 0x64 break duration = 10s
0x01 avail num
0x01 avails expected
0x01 auto return flag
0x01, 0x0A op ID = insert avail descriptor request data
0x00, 0x05 data length = 5 bytes
0x01 number of avails = 1
0xA1, 0xB2, 0xC3, 0xD4 avail ID = 0xA1B2C3D4
1
The DPI_PID_index value contained within the SCTE-104 message is not a PID. It provides a way of addressing a
particular VCM within a multi-module unit to ensure that the SCTE104 messages are received by the specific
encoder. It is a 2 byte value.
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