Metrics

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March, 2020

  • 9 March

    Lesson of the Week: Computing VMAF with FFmpeg

    This lesson teaches you how to compute VMAF with FFmpeg. It includes a download link to a specially compiled version of FFmpeg that can compute VMAF and to a zipped file that contains the batch files and input/output files shown in the lesson. I’m adding it as a lesson to …

December, 2019

  • 18 December

    When and How to Use Objective Quality Metrics

    Recently, video quality metrics have gotten a lot of hate, primarily from codec vendors. For example, yesterday on LinkedIn, respected Beamr CTO Dror Gill wrote, “everyone agrees that subjective (human) testing is the only accurate way to measure true perceptual quality.” After I pointed out industry support for using video …

  • 11 December

    Fine-Tune Your Encoding With Objective Quality Metrics – Video and Handout

    My Streaming Media session on using video quality metrics is now available for replay immediately below. You can download the handout here. Here’s the session description. T101. HOW-TO: Fine-Tuning Your Encoding With Objective Quality Metrics Tuesday, November 19: 10:30 a.m. – 11:15 a.m. Choosing the number of streams in an …

  • 10 December

    Buy Moscow State University Video Quality Measurement Tool; Get Video Quality Metrics Course for Free

    The Moscow State University Video Quality Measurement Tool has long been my go-to desktop tool for computing video quality metric scores. When I created my course on Video Quality Metrics, I included six lessons on using the tool. Here’s a brief video that shows operation and the new features in …

  • 4 December

    My Three Favorite Features in MSU VQMT Version 12

    Moscow State University’s Video Quality Measurement Tool (VQMT, $999 with volume discounts available) is my go-to desktop tool for computing metrics like VMAF, PSNR, and SSIM. The program is easy to use, has great visualization tools, and lets me inspect videos on a frame-by-frame basis. MSU recently released version 12 …

November, 2019

  • 25 November

    Download Handout from Video Quality Metric Session

    I had a 45-minute session at Streaming Media West 2019 entitled HOW-TO: Fine-Tuning Your Encoding With Objective Quality Metrics You can download the handout here. This version is about 200 MB because it contains three video demonstrations of the SSIMPLUS VOD Monitor and several other videos, but you’ll need Flash …

  • 25 November

    Collection of VMAF Resources

    A colleague asked for some resources relating to VMAF. Rather than answer in an email I thought I would create a post around it. Some of these are from Netflix, most from me (Jan Ozer). I’ve broken the items into three groups; Computing VMAF, Using VMAF, and About VMAF. I hope …

  • 10 November

    Voronoi-based Objective Quality Metrics for Omnidirectional Video

    The Voronoi omnidirectional video metrics have the best correlation between test scores and subjective ratings than all measured 2D and 3D metrics according to its inventors. It’s an open-source metric you can download and learn to use below. I’ll be discussing the Voronoi metric in my upcoming talk on 2D …

  • 10 November

    Compute VMAF Using FFmpeg on Windows

    Author’s note: When this post was written, the Zeranoe FFmpeg Windows download didn’t include VMAF, so you had to either download this version or compile your own. Now the Zeranoe version does include VMAF support; all you need to do is download the models and run the correct command strings. …

October, 2019

  • 30 October

    Preview Lesson: Tuning for Encoding When Measuring with Video Quality Metrics

    I’m pulling together some materials for my pre-conference session at Streaming Media West (November 18-20 in Los Angeles) entitled Objective Quality Metrics 2D & 3D: What They Are, How To Compute Them, & How To Use Them. One lesson talks about “tuning” when encoding files to be measured with metrics …