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Category: Computer Engineering

AV1 beats x264 and libvpx-vp9 in practical use case | Engineering Blog | Facebook Code

Improved video compression is important for delivering digital video files more quickly and with higher quality, while using less bandwidth and storage. Everything from 4K movie streaming to smartphone video chat to laptop screen sharing can be enhanced by making the video files smaller through better compression codecs. The Alliance for Open Media — a consortium founded in 2015 and made up of video-on-demand providers including Amazon, Facebook, Google, Microsoft and Netflix, along with web browser developers and semiconductor firms…

A cautionary tale about passwords – Medium Engineering

A post for engineers and the technically astute to share with less technical friends and family, brought to you by the Department of Technical Comfort & Security at Medium (previously known as IT). One day, Rabbit frantically hopped over to his friend Fred. Rabbit’s ears were sticking straight up in alarm, “Fred! I just got an email that there was suspicious activity on my RoughageAndMore.bun account! What do I do?” Fred puffs up a bit and says, “It’s okay Rabbit,…

Engineers build smallest volume, most efficient wireless nerve stimulator

The small size of StimDust can be seen in comparison to a dime. Credit: Rikky Muller In 2016, University of California, Berkeley, engineers demonstrated the first implanted, ultrasonic neural dust sensors, bringing closer the day when a Fitbit-like device could monitor internal nerves, muscles or organs in real time. Now, Berkeley engineers have taken neural dust a step forward by building the smallest volume, most efficient wireless nerve stimulator to date. The device, called StimDust, short for stimulating neural dust,…

Fixing reachability to 1.1.1.1, GLOBALLY!

Recently we announced our fast, privacy-centric DNS resolver 1.1.1.1, supported by our global network. As you can see 1.1.1.1 is very easy to remember, which is both a blessing and a curse. In the time leading up to the announcement of the resolver service we began testing reachability to 1.1.1.1, primarily using the RIPE Atlas probes. The RIPE Atlas project is an extensive collection of small monitoring devices hosted by the public around the world. Currently there are over 10,000…

Automated Canary Analysis at Netflix with Kayenta – Netflix TechBlog – Medium

by Michael Graff and Chris Sanden Today, in partnership with Google, we have open sourced Kayenta, a platform for Automated Canary Analysis (ACA). Kayenta leverages lessons learned over the years of delivering rapid and reliable changes into production at Netflix. It is a crucial component of delivery at Netflix as it reduces the risk from making changes in our production environment. In addition, Kayenta has increased developer productivity by providing engineers with a high degree of trust in their deployments.…

Tumblr Engineering — A Big New Beautiful Future for the Web at Tumblr

As a platform that prides itself on being a home for artists and creatives alike, it only makes sense that we allow our users to fully customize their Tumblrs to fully express themselves. Here at Tumblr, the world is your oyster not only in terms of looks but also in how you create your theme. I wanted to demonstrate how you too can develop a theme using Redux and React. Since there are plenty of docs and tutorials on how…

Testing our Confidence: Scaling Software Quality with Automated Testing

As Wayfair’s business has scaled, so too has the size of our engineering teams – not to mention the complexity of the software features we’re building. At the same time, moving quickly in the global tech landscape has never mattered more. As a modern tech company, one simply cannot afford to slow down the rate of feature delivery. While it’s fairly easy to rollback and recover from a broken build, it’s not entirely without pain. As we have more and…

Fly with individually air-conditioned seats

The Aviation Double Seat features a combination of seat ventilation by means of fans and thermal regulation by seat heating. Credit: Gentherm GmbH In cooperation with its partner Gentherm, Fraunhofer has developed an air-conditioned business class seat (Aviation Double Seat). The seat features a combination of seat ventilation by means of fans and thermal regulation by seat heating. This leads to an optimal temperature control of the seat surface as well as a continuous moisture removal. The result is a…

First dynamic spine brace—robotic spine exoskeleton—characterizes spine deformities

The Robotic Spine Exoskeleton consists of two six-degrees-of-freedom parallel-actuated modules connected in series, each with six actuated limbs. Each module controls the translations/rotations or forces/moments of one ring in three dimensions with respect to the adjacent ring. Credit: Sunil Agrawal/Columbia Engineering Spine deformities, such as idiopathic scoliosis and kyphosis (also known as “hunchback”), are characterized by an abnormal curvature in the spine. The children with these spinal deformities are typically advised to wear a brace that fits around the torso…

Adding DNS-Over-TLS support to OpenWRT (LEDE) with Unbound

If you want to skip ahead to instructions, scroll to the next section. But I, like a TLS handshake, am very verbose so please enjoy this opener. Imagine this scenario – I’m at a restaurant and need to have a private phone conversation but unfortunately my phone’s battery is drained. To get around this problem, I borrow my friend’s phone and dial the number – to protect my privacy I walk outside. When I’m done with the call, I come…