POIS conditioning
Elemental Live events can be configured to communicate with a POIS server. During processing of the input, each time a SCTE-35 message is encountered, Elemental Live sends the message contents to the server. The POIS responds with SCTE-35 content that might be identical to the original, slightly different from, or completely different from the original.
Elemental Live also supports handling of “out-of-band” SCTE-35 messages from the POIS – messages that are not a response to a message originally sent by Elemental Live. If such a message is received, Elemental Live accepts and processes it.
POIS conditioning and other SCTE 35 features
This section describes how POIS conditioning interacts with other SCTE 35 features that you can set up.
Ad avail mode
When POIS conditioning is enabled, the ad avail mode is always set to splice insert. For information about how this value affects the behavior of manifest decoration and ad avail blanking see Setting the ad avail mode to support manifest decoration or ad avail blanking for all outputs.
SCTE-35 messages inserted by REST API
All these messages are sent to the POIS along with messages that are already in the input.
Manifest decoration
The effect of POIS conditioning on manifest decoration is as follows:
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HLS Outputs – A message received from the POIS might include instructions to decorate an HLS manifest (not other types of manifests). This information is used to decorate the HLS manifest.
How Elemental Live processes the decoration information depends on how the event or event has been configured:
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If the event or event does not have manifest decoration enabled for HLS outputs, then the information is ignored.
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If the event does have it enabled, then the decoration information is inserted in the manifest.
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The information is inserted into the manifest “as is.” The style of the information might not match the styles (ad marker styles) specified in the event. Elemental Live doesn't check for format inconsistencies between these instructions and the ad marker style.
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Other Outputs – Decoration of other manifest types is according to the information in the SCTE-35 message and how the Elemental Live event is set up for manifest decoration and which ad avail mode is enabled. The POIS conditioning has no effect on these manifest types.
Blanking and blackout
The effect of POIS conditioning on blanking and blackout is as follows:
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Extra Blackout Instructions – A message received from the POIS might include explicit “blank the content corresponding to this SCTE-35 message” instructions for any SCTE-35 message.
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Blanking Image – A POIS response might include reference to a blanking .png or .bmp file. Elemental Live uses this file for any blanking/blackout if it can find the file at
/data/server/esam/on the Elemental Live node.If Elemental Live cannot find the file, it uses a black slate.
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Restriction Flags – In ESAM mode, the Override restriction flags in the Elemental Live event (Ignore Web Delivery Allowed flag and Ignore No Regional Blackout flag) are always cleared (not selected). See Ad avail blanking and blackout.
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Passthrough or Removal – Without POIS conditoin, if passthrough is enabled in the Elemental Live event, then the rule is that all SCTE-35 message are passed through.
But when POIS conditioning is enabled, the POIS can override this rule: if the POIS instruction is to remove a given SCTE-35 message, then that message is removed and is not passed through, even though passthrough is enabled in Elemental Live.
Procedure to enable POIS conditioning
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In the Profile or Event screen, select Advanced Avail Controls (in the Input section towards the top of the screen):
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In Ad Avail Trigger, choose ESAM. More fields appear.
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Complete the fields as follows:
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Complete the first 6 fields to identify the endpoints on the POIS.
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For Response Signal Preroll, change the value as desired to set the distance (in milliseconds) between the time that the SCTE-35 message is inserted and the start time of that ad avail.
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