Source History Content Analysis
This graph shows the number of Content Analysis errors of each type (e.g. CC Errors, Blank Picture etc.) that occurred over time. Errors are shown separately for each PID.
The graph also displays the following quality scores:
ePSNR - For Broadcaster (v13 and up) streams, the estimated Peak Signal-to-Noise Ratio (ePSNR) is shown for each relevant PID. The scale for the ePSNR is shown along the right side of the graph. ePSNR values can range from 11 to 60, with 60 representing the highest quality.
- Additional ePSNR data is shown in the Source History Encoding Quality ePSNR section.
- ePSNR analysis is supported for MPEG2 or H.264 content, but not for most types of HEVC/H.265 content. Also, Sources must be 8-bit (not HDR) and Progressive (not Interlaced).
eVMAF - the estimated Video Multimethod Assessment Fusion is shown for each relevant PID. This quality score uses machine learning to predict how humans perceive video quality. The score can range from 0 to 100 , where a higher score represents better quality.
In both the PSNR and VMAF cases, Zixi trained Machine Learning models to estimate the score without needing to do the full calculation because in both cases the original, uncompressed reference is needed for the full calculation. The ML model is also computationally more efficient (less CPU) than the full calculations.
The Y-axis represent the following:
- Left axis - the number of CC Errors or TR101 misses.
- Right axis - the quality score (ePSNR/eVMAF)
ZEN Master shows data for the following Content Analysis parameters:
- CC (Continuity Count) Errors – incorrect packet order, a packet occurs more than twice, lost packet
- Blank Picture - blank frames of any color for a duration of ~60s or longer
- Frozen Video – no motion detected for a duration of ~60s or longer
- Audio Clipping - clipped audio on AAC or MPEG audio
- Silent Audio – silent audio (dBFS < -90) on AAC or MPEG audio with a duration of ~30s or longer
- CQA Misses - shows the number of frames for which CQA (Content Quality Analytics) was skipped (i.e. to conserve resources).
- TR101 Misses - shows the number of frames for which TR101 was skipped (i.e. to conserve resources).
- ePSNR - weighted average of estimated Peak Signal-to-Noise Ratio (PSNR).
- eVMAF - estimated Video Multimethod Assessment Fusion score.
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