Encoder: Alerting

The alerting feature configures Volicon Media Intelligence service to constantly monitor program streams. If the stream does not meet the monitoring criterion for the duration specified, an alert is generated. A single alert is dispatched for each event. If the stream returns to normal in excess of the recovery time, a new alert is generated if the stream once again falls outside monitoring parameters.

Figure: Encoder alerting video

Table: Video alerting

Video loss	When video framing loss (commonly known as “sync”) is detected by hardware and persists over video duration threshold, then VIDEOLOST alert generated; only duration threshold is configurable, not level threshold; e.g., video lost signal = TRUE over duration of 31 sec exceeding cycle time and duration threshold; when notification enabled, SNMP trap and email messages are sent (if configured by admin)
Detection	Default: 30 seconds
Recovery	Default: 10 seconds
Black screen	When percentage of black pixels (BS) in video frames of incoming video signal exceeds certainty threshold and persists over duration threshold; when notification enabled, SNMP trap and email messages are sent (if configured by admin)
Detection	Default: 30 seconds
Recovery	Default: 10 seconds
Threshold	Default: 95%
Static screen	Detected when video frame pixels at same frame location are compared (for color and luminosity) to pairs of consecutive video frames; and percentage of matching pixels exceeds static screen (SS) threshold and duration threshold; when pixel color, luminance and locations matching between pairs of consecutive video frames exceed 95% of all video frame pixels for longer than 30 seconds, video static alert is declared When notification enabled, SNMP trap and email messages are sent (if configured by the admin)
Detection	Default: 30 seconds
Recovery	Default: 10 seconds
Threshold	Default: 95%

Figure: Encoder alerting audio

Table: Audio alerting

Audio high	Audio high fault is detected when the incoming audio stays above the high-level threshold long enough to exceed the audio duration threshold. Audio high alert example: Audio alert is configured on a channel. Certainty threshold = -1 dB; duration set to default of 30 seconds; audio input signal detected = 2 dB (above certainty) for six minutes (exceeding the cycle time for the lineup plus the duration threshold). A media fault, therefore, is detected, generating an audio alert and automatically creating a fault clip, which is stored under the clips (fault clips section on the Volicon Media Intelligence service media player). When the notification is enabled, SNMP trap and email messages are sent (if configured by the admin). If you wish to change any certainty, duration or recovery levels, please contact Volicon Media Intelligence service Support.
Detection	The default is 30 seconds.
Recovery	The default is 10 seconds.
Threshold	The threshold is -1dB.
Audio low	Low audio fault is detected when the incoming audio stays below the low-level threshold, and the duration of the fault exceeds the duration threshold. Disable audio alert detection on channels with frequent silence. When the notification is enabled, SNMP trap and email messages are sent (if configured by the admin).
Detection	The default is 30 seconds.
Recovery	The default is 10 seconds.
Threshold	The default is -40dB.

Figure: Encoder alerting metadata

Table: Metadata alerting

Metadata	Monitors embedded channel metadata
Detection	Default: 30 seconds
Recovery	Default: 10 seconds
Threshold	Defines number of metadata instances missed in detection threshold duration; e.g., if threshold set to 5, and more than 5 instances missed during 30-second window, then alert generated

Table: Sync

Sync mode

Determines how quickly NTP sync will compensate for real-time clock drift