Taxonomy of Video Quality Metrics

The sheer number of video quality measurement tools makes it difficult to choose the right metric. Here’s a quick overview of some of the options and what they offer. All compressionists should use video-quality metrics to make compression-related decisions regarding data rate, key frame interval, and other settings. Unfortunately, the sheer number of options and…

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Netflix Adding TLS to Protect User Privacy

The Netflix Open Connect team announced earlier this week that it would be using Transport Level Security. Here’s a look at its innovative approach to protecting viewing data at scale. In a blog post earlier this week called “Protecting Netflix Viewing Privacy at Scale,” the Netflix Open Connect team detailed the innovative approach the company…

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Bitrate Control and QoE-CBR is Better

Summary (The MPD) When distributing video under constrained conditions, the bitrate control technique used to encode the files can have a profound impact on the quality of experience (QoE). Specifically, under some conditions, CBR-encoded files deliver a superior QoE to files encoded using 200% constrained VBR, while also reducing the overall bandwidth delivered. For producers…

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Choosing the Optimal Segment Duration

Summary When choosing an HLS or DASH segment duration for VOD video, the nature of the server/player connection is critical. For persistent connections, a segment size of two-three seconds produces good quality and optimal system throughput. For non-persistent connections, a segment size of six seconds produces the best overall throughput. With live video, if latency…

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Per-Title Encoding: It’s Everywhere!

Netflix started the per-title encode optimization revolution in December 2015, and now per-title encoding is showing up in more and more places. Why? Because it improves the quality of hard-to-encode videos, and saves bandwidth costs on easier-to-encode videos. If per-title optimization is not available in your encoder or encoding service, it’s time to start demanding…

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