SCTE 104/35 refers to a pair of related standards used in digital television broadcasting for ad insertion and program signaling:

SCTE 104 is the "Automation System to Compression Equipment Communications API" standard. It defines how automation systems (like traffic and billing systems) communicate with video compression equipment to insert cue messages and control ad insertion timing.

SCTE 35 is the "Digital Program Insertion Cueing Message" standard. It specifies the format and syntax of cue messages that are embedded directly into MPEG transport streams to signal when commercial breaks, program boundaries, or other events should occur.

Together, these standards enable:

• Dynamic ad insertion - Allowing different ads to be inserted for different viewers or regions
• Program splicing - Seamlessly switching between network feeds and local content
• Blackout management - Replacing restricted content in certain geographic areas
• Emergency alert insertion - Overriding regular programming for emergency broadcasts

The typical workflow involves SCTE 104 messages being sent from automation systems to encoding equipment, which then embeds SCTE 35 cue tones into the video stream. Downstream equipment (like cable headends, streaming platforms, or broadcast stations) can then detect these SCTE 35 markers and take appropriate actions like inserting targeted advertisements or switching to alternate content.

This technology is widely used across cable TV, satellite TV, IPTV, and increasingly in streaming video services to enable sophisticated content management and targeted advertising capabilities.

The SCTE 104/35 license  allows the following on Prism devices

• Ingest SCTE 104 triggers and encode them into the MPEG Streaming types (MPEG TS, SRT) as SCTE 35 triggers
• Decode SCTE 35 triggers and embed SCTE 104 onto the SDI.

1. Before you begin, make sure to purchase the SCTE 104/35 license. If you don't have a license, contact [email protected] to purchase one.
2. Navigate to the IP address of your Prism device to open the web UI.
3. From the web UI, open the Licenses page and click the Enter License Key tab to enter the Decode License key. 

3. Open the Metadata settings and turn on DPI (SCTE 104/35) to Enable

3. Send a test message