Learning

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FFmpeg to the Rescue: Muxing Audio and Video Files

So, there I was downloading videos from YouTube to include in a PowerPoint for a training course I was producing. Unfortunately, my download tool, wondershare’s excellent video converter, downloaded separate audio and video streams, the video in an MP4 wrapper and the audio as an MP3 file. So I had to mux the two to input them into PowerPoint. A …

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Here’s What I’m Teaching at Streaming Media West Next Month

Streaming Media West is coming up next month in the City of Los Angeles (as opposed to Huntington Beach where it’s been the last few years). Specifically, it’s at the Westin Bonaventure on November 19-20 (Tuesday/Wednesday) with pre-conference sessions on Monday the 18th. I’ll be my normal busy self with two pre-conference sessions and several presentations. Here are the dates, …

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Creating a Unique Encoding Ladder for Smartphone Viewers

Many producers distribute the same encoding ladder to all viewers. However, sending a 1080p stream to smartphone viewers may be a waste of bandwidth as both SSIMPLUS and VMAF scores reveal that lower resolution, lower-bandwidth videos deliver similar quality at a lower cost. This tutorial, from my course Computing and Using Video Quality Metrics, shows you the tests I performed …

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New Five-Star Review for FFmpeg Book

Derrick Freeman is a luminary in the Streaming Video world, an expert on Wowza Streaming Engine and Telestream Wirecast (among other products) who has consulted with and instructed dozens of companies, universities, and other organizations. When Derrick needed to learn how to use FFmpeg, he purchased a copy of my book, Learn to Produce Video with FFmpeg in 30 Minutes …

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The Evolving Encoding Ladder: What You Need to Know

This article discusses the evolution of the encoding ladder from the fixed ladder presented by Apple in Tech Note TN2224 to context-aware-encoding, which creates a ladder that not only considers the encoding complexity of the content, but also the producer’s QoE and QoS metrics. The encoding ladder embodies the most significant encoding decisions made by encoding professionals, and understanding this …

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Buyers’ Guide to Per-Title Encoding

After three years or so in gestation, per-title encoding is becoming a required feature on most encoding platforms, whether in-house software or SaaS cloud providers. In this buyers’ guide, we’ll review a list of features to look for in per-title encoding offerings and present a testing structure to evaluate the contenders that make it to your short list. If you’re …

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Download Slides: Introduction to ABR Production and Delivery

Here’s the description; link to the PDF is below: W1. Introduction To ABR Production & Delivery Monday, May 6: 9:00 a.m. – 12:00 p.m. This course helps those new to streaming media get familiar with the relevant terms, concepts, and technologies. The session begins with a definition of terms like codecs, container formats, and adaptive bitrate streaming, as well as encoding …

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You Are Almost Certainly Wasting Bandwidth Streaming to Mobile Phones

A few weeks ago, I wrote about the VMAF Phone Model which measures VMAF score for viewers watching on a mobile phone. Since then, I gave a presentation at NAB on VMAF and ran some calculations comparing the phone and default models. I share those below. First, have a quick look at the three VMAF models shown on the slide …

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Talking on VMAF at the NAB Streaming Summit

Just a quick note to let you know that I’ll be speaking at the NAB Streaming Summit on Using VMAF, Netflix’s Video Encoding Metric to Measure QoE. Description: Netflix uses video quality metric VMAF that combines human vision modeling with machine learning, to make automated encoding decisions in their per-title/per-scene encoding workflow. This presentation will cover what VMAF is, how …

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Free Video: Scaling and Letterboxing in FFmpeg

Embedded below is a free lesson from my course, Produce Videos with FFmpeg: The Beginner’s Course (http://bit.ly/learn_ffmpeg). The previous lesson in the course describes when you can use the -s command to set resolution; this lesson details your options when you can’t. This typically occurs when the display aspect ratio of your output is different from your input, which happens often …

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