June, 2022

  • 21 June

    SVT-AV1 and Libaom Tune for PSNR by Default

    As of June 22, 2022, libaom-AV1 and SVT-AV1 tune for PSNR by default, and libaom-AV1 doesn’t appear to have a mode that optimizes actual video quality. Be sure to verify and consider this when comparing the codecs to others. Most of the time with codec experimentation, a lapse in attention …

May, 2022

  • 12 May

    Finding the Optimal Top Rung Data Rate

    Table 2. Top-rung quality of these UGC and premium services.

    The top rung of your encoding ladder is the most expensive to deliver, and in many regions, it’s also the most frequently viewed. Encode at too high a bit rate and you’re wasting money; encode too low, and you’re potentially reducing viewer quality of experience. This makes choosing the top …

March, 2022

  • 2 March

    MSU Updates Video Quality Measurement Tool

    Video Quality Measurement Tool

    Moscow State University’s Video Quality Measurement Tool (MSU VQMT) is my go-to utility for computing and visualizing objective metrics like VMAF, PSNR, and SSIM. In version 13, MSU increased codec compatibility and metric performance, added new HDR metrics and display capabilities, and enhanced VQMT’s already best-in-class visualization tools. If you’re …

October, 2021

  • 11 October

    Announcing Updates to Video Quality Metrics Course

    Just a brief announcement that I’ve updated the course, Computing and Using Video Quality Metrics: A Course for Encoding Professionals, that teaches encoding professionals how to measure and apply metrics like VMAF, SSIMPLUS, MS SSIM, SSIM, and Apple’s AVQT. The updates include: Lessons on computing and applying Apple’s AVQT metric. …

September, 2021

  • 8 September

    What are QoS and QoE?

    Figure 1. How QoE and QoS interrelate. From here.

    This article is derived from a lesson in Streaming Media 101: Technical Onboarding for Streaming Media Professionals. If you’re looking for an efficient way to get up to speed on key streaming terms, technologies, workflows, and best practices, check out the course here.  Companies distribute videos for a myriad of …

August, 2021

  • 6 August

    AVQT Compared to VMAF and SSIMPLUS

    Author’s note: After completing this long and arduous post, Apple sent a note that I was interpolating their scores incorrectly, leading to more analysis shown as an addendum below.  What: This article compares Apple’s AVQT metric to VMAF and SSIMWAVE’s SSIMPLUS metrics, with very limited subjective testing from The …

July, 2021

  • 27 July

    Testing Video Quality With Apple AVQT

    In the first article in this series, Baby Steps with Apple’s Advanced Video Quality Tool and Quality Metric, I detailed what Apple’s Advanced Video Quality Tool (AVQT) is and how to use it. In this article, I tested multiple video files with Apple AVQT and describe my user experience. In …

  • 8 July

    Baby Steps with Apple’s Advanced Video Quality Tool and Quality Metric

    I’m adding some lessons that identify and describe the operation of Mac video utilities to the online course Streaming Media 101 and took this as an opportunity to have a look at Apple’s Advanced Video Quality Tool  (AVQT) which launched at the company’s 2021 World Wide Developers Conference. I’m making …

May, 2021

April, 2021