A dependency-light Python script (standard library only) that reads a file of per-frame quality scores — a plain list, a CSV column, or a libvmaf JSON log — and prints every common pool side by side: arithmetic mean, harmonic mean, median, minimum, the 5th/10th/25th percentiles, and a Minkowski pool. It flags when the arithmetic mean floats more than a set gap above the worst 5% of frames (the signal that the average is hiding a bad stretch), supports an optional pass/fail quality gate on any po
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The handbook · 7 volumes
Fora Soft Video Engineering Handbook
This script pools per-frame quality scores with mean, harmonic mean, percentiles and Minkowski pooling, and flags when the average hides a bad stretch. We wrote seven volumes on the video stack; Volume 1 is where quality metrics, compression artifacts and encoder tuning are covered in depth, with Volume 3 on QoE and Volume 6 on AI models. Written by Nikolay Sapunov, CEO at Fora Soft.
Need a quality gate that catches bad stretches your average VMAF hides?
Share your encoding pipeline and current QC, and we will set pooling rules and pass/fail thresholds that fit your content. 250+ video products shipped since 2005.
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