July, 2020

  • 9 July

    Compressionists: You’re Only as Good as Your Tools

    I’m reviewing AV1 encoders for Streaming Media Magazine and was performing some QC on the AV1 files that I produced with the latest version of FFmpeg. Two file details I always check are GOP size and whether the GOPs are closed or not. I check these for multiple reasons.

June, 2020

  • 15 June

    Preliminary VMAF and PSNR Scores for New Xilinx Transcoding Appliances

    Live streaming at scale is the perfect application for hardware transcoders that deliver highly-affordable encoding density. Xilinx just announced a series of transcoding appliances targeting these live streaming use cases built around the new Xilinx Real-Time (RT) Server reference architecture. I’ve been benchmarking output quality with two card-based encoders deployed …

May, 2020

  • 22 May

    AV1 Turns 2.0

    Just a quick announcement that the Alliance for Open Media has launched version 2.0 of the AOMedia AV1 encoder that you can download here. According to the Phoronix website, from which I grabbed this news: “Libaom 2.0 is the first release since the original 1.0 release back in mid-2018 after …

  • 19 May

    Upcoming Training for Streaming Production

    Here are descriptions of the two courses I’ll be teaching in a few days on streaming media production.  Streaming Media East will be held online, with five 3-hour pre-conference training sessions that cost $199 each and a robust assortment of free 1-hour sessions. Here are the titles, dates, and times …

  • 6 May

    Online Training for Streaming Production, Cloud-based Streaming, and FFmpeg

    Streaming media production and delivery has become even more critical over the last few months; here’s an opportunity to boost your skills and knowledge via live online training by recognized industry experts.  I’m sad that Streaming Media East won’t be held in Boston as planned; I really enjoy those shows. …

  • 5 May

    New Five-Star Review for FFmpeg Book

    One thing that never gets old is a five-star review on Amazon. I just received another one for my book, Learn to Produce Video with FFmpeg: In Thirty Minutes or Less (2018 Edition), which is available on Amazon ($34.95) and for PDF download ($29.95). In this review from a verified …

April, 2020

  • 17 April

    Tuning for Metrics: What About VMAF and VP9?

    If you’re comparing codecs with video quality metrics, you should consider tuning for that metric. However, x264 and x265 don’t have a VMAF tuning option. According to my analysis, it appears that tuning for PSNR is the best option and one you should strongly consider. When working with VP9, there’s …

  • 9 April

    Encoding VP9 in FFmpeg: An Update

    This is a long post only of interest to those attempting to optimize their VP9 encodes. The three key takeaways are 1) use the command script shown on the bottom of the page, 2) a speed setting of 2 offers the optimal quality/performance tradeoff, and 3) the row-mt setting improves …

  • 3 April

    VMAF is Hackable: What Now?

    Just a quick note to let you know about some recent findings relating to the Netflix VMAF metric. By way of background, VMAF launched in June 2016 as the metric that powered Netflix’s per-title encoding engine, replacing PSNR. The fact that Netflix created and used VMAF gave the metric tremendous …