I just finished one consulting project that involved testing 22 clips with three codecs to produce nine rate-distortion charts per clip (1080p, 720p, 480p for VMAF, SSIM, and PSNR) and am working another with 35 clips with 4 RD charts each with two encoding modes. So efficient chart creation in Excel is now a huge priority. One frustration with Excel …

If you’re onboarding new hires in streaming media-related positions, you now have an affordable option for providing and monitoring that streaming-specific training. If you’re a professional seeking to upgrade your skills and gain accreditation, you have that option as well.  Over the last few years, streaming media has become critical for entertainment and communications, with the quarantines necessitated by Covid-19 …

We’re all aware of the sudden need to reduce streaming bandwidth to alleviate congestion. MediaMelon’s SmartPlay/QBR is a very viable option for this that was recently adopted by Brazilian OTT producer Telecine. I reviewed MediaMelon’s QBR technology for Streaming Media Magazine back in 2017. I called it a “server-side, per-title delivery mechanism.” Unlike traditional per-title technologies that re-encode your files …

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 an additional complication; tuning for PSNR doesn’t appear to work.  …

The first review is up for my new course, Streaming Media 101 – Technical Onboarding for Streaming Media Professionals, and it’s a five-star review. I designed the course to provide technical fundamentals and an overview of key industry products and services and the companies that create and support them. The goal was to teach students skills like live and VOD …

Producing the chart above involved encoding 35 files using 5 different presets and then recording start and stop times. Since the files were about 20-seconds long, seconds were important. I’m sure a smarter compressionist than I could write a Python script to harvest the start and stop times but I do it by hand, which is complicated because Windows Explorer …

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 performance significantly with zero quality loss when multiple unused cores …

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 credibility and because Netflix open-sourced VMAF it was quickly added …

In a previous lesson, I explored how to optimize quality on a webcam; this lesson tackles the audio side. Rather than simply discuss the various options I recorded multiple segments using the mics shown below so you can hear the difference. I shot all segments under the same conditions, in my office with fluorescent lights running, which caused the faint hum …

I spoke with Streaming Media Magazine’s Eric Schumacher-Rasmussen about the new course, Streaming Media 101: Technical Onboarding for Streaming Media Professionals. The video is available on YouTube so I embedded it below. If you’d rather read the transcript, click here to see the article on the Streaming Media website.  Eric’s second question was “what’s the elevator pitch?” Here’s the …