Quality Check Guide
This guide provides an overview of the quality check parameters and SNMP notifications used for monitoring video and audio recordings. The system is designed to detect and report issues related to video black frames, freeze frames, audio silence, loudness levels, and monotone audio. Additionally, it ensures that recording processes run smoothly by monitoring disk space and file transfers.
Quality Check Parameters
Video Survey Grid
The video is analyzed based on a predefined grid with X x Y dimensions, ensuring a structured approach to quality control.
Detection of Black Frames
To identify video blackouts, the system checks for black frames using the following parameters:
- Enabled: This feature can be turned on or off.
- Video Threshold: RGB values are used to determine black frame detection.
- Tolerance: The number of pixels that can be ignored while still considering a frame as black.
- Reporting Criteria: A black frame is reported only if it lasts for a specified number of seconds.
Detection of Freeze Frames
To identify instances where the video remains static, the system includes freeze frame detection:
- Enabled: Can be activated or deactivated.
- Tolerance: Defines the acceptable percentage of unchanged pixels before a frame is considered frozen.
- Reporting Criteria: A freeze frame is logged if it persists beyond a certain threshold in seconds.
Loudness Calculation
The system can measure the loudness level across the duration of a video chunk:
- Enabled: This feature can be turned on or off.
- The analysis covers the entire chunk duration, ensuring a comprehensive measurement.
Audio Channel Selection
Since some input sources contain multiple audio channels (e.g., 8-channel Decklink inputs), the system allows selection of specific channels for loudness measurement and audio checks:
- Enabled: This can be toggled on or off.
- Only the selected channels will be considered for analysis, avoiding unnecessary processing of silent or irrelevant channels.
Detection of Audio Silence
The system detects and reports periods of audio silence using the following settings:
- Enabled: Can be switched on or off.
- Minimum Volume Threshold: Defines the decibel (dB) level below which audio is considered silent.
- Minimum Duration: The silence must persist for a specified number of milliseconds before being reported.
Detection of Abnormal Audio Levels
To monitor and report excessively loud audio, the system includes an audio level check:
- Enabled: This feature can be enabled or disabled.
- Maximum Volume Threshold: Sets the upper limit in dB for acceptable audio levels.
- Minimum Duration: Only audio that exceeds the threshold for a defined duration (in milliseconds) will be flagged.
Detection of Monotone Audio
Monotone audio detection helps identify prolonged segments of audio with no significant variation:
- Enabled: Can be activated or deactivated.
- Minimum Duration: A section of audio is considered monotone if it remains unchanged beyond a specified number of milliseconds.
SNMP Notifications
Overview
To ensure real-time monitoring and issue detection, SNMP messages are sent based on the "Enable SNMP Sending" setting in the Recording Check tab. To prevent excessive notifications, the same error message will not be resent within one hour.
SNMP Error Codes and Their Meaning
The system generates SNMP messages for the following conditions:
- 0x14000002: Recording error detected. This may indicate process termination; the system will restart the service if configured to do so.
- 0x14000008: Video blackout detected.
- 0x14000009: Freeze frame detected.
- 0x14000020: Audio silence detected.
- 0x14000021: Excessive audio loudness detected.
- 0x14000022: Monotone audio detected.
- 0x1400000C: Storage disk space check failure.
- 0x14000007: Error encountered while swapping or copying files to storage.
- 0x14000036: SQL error detected, possibly related to file ingestion.
By implementing these quality checks and SNMP alerts, the system ensures a robust monitoring process, enabling proactive identification and resolution of issues in video and audio recordings.