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  Capture video stream with WebRTC

WebRTC(Web Real-Time Communication) is an API supporting real time audio and video communication through a browser. It is now a recommended W3C standard. This post is to show you how to capture video stream and screenshot with WebRTC. Capture video stream To play video stream from the video camera, we first need to put a video tag in our code: <video id="video"></video> The main function to get the video stream is the navigator.getUserMedia, as of now only few of the browsers support...

   WebRTC,Video,Screenshot     2013-10-24 21:04:41

  Introduction to the Application of eBPF in Golang

Most of the time, when we develop software or even use software, we play within the safe boundaries of the operating system. We might not know how the network interface welcomes that IP packet, nor how the filesystem handles the inodes when we save a file. This boundary is called user space, which is where we write applications, libraries, and tools. But there's another world, kernel space, where the operating system's kernel resides and is responsible for managing system resources such as memor...

   EBPF,GOLANG,GUIDE,APPLICATION     2024-10-02 08:46:37

  Sass Style Guide: A Sass Tutorial on How to Write Better CSS Code

Writing consistent and readable CSS that will scale well is a challenging process. Especially when the style sheets are getting larger, more complex, and harder to maintain. One of the tools available to developers to write better CSS are preprocessors. A preprocessor is a program that takes one type of data and converts it to another type of data, and in our case CSS preprocessors are preprocessing languages which are compiled to CSS. There are many CSS preprocessors that front-end develop...

   CSS,SASS,TUTORIAL     2015-09-17 06:40:47

  Some Features of Windows 10 You Didn’t Know About

Since the launch of Windows 10 everyone around the world is crazy about it. No one wants to use the old Windows 7 and 8 anymore. Windows 10 is simple, light and has all the great features. The interface is awesome and gives it a techy look as well. Well, what if we told you that there are still some features of this great OS that are yet to be discovered? Yes, that is right. Today we will be discussing a few of the features that are not commonly known to people. Secret Start Menu That is right, ...

   WINDOWS 10, WINDOWS 10 FEATURES     2020-04-17 03:26:58

  True Scala complexity

Update 2: Sorry for the downtime. Leave it to the distributed systems guy to make his blog unavailable. Nginx saves the day.It’s always frustrating reading rants about Scala because they never articulate the actual complexities in the core language.Understandable—this post is intended fill that gap, and it wasn’t exactly easy to put together. But there’s been so much resistance to the very thought that the complexity exists at all, even from on up high, that I thou...

   Scala,Complexity     2012-01-10 07:17:07

  Ways to make elements in HTML center aligned horizontally

In our daily HTML design,  it is an easy job to horizontally center align an element with known width. <div class="element">I am<a href="http://www.aiubug.com" target="_blank" rel="external" title=""> bug </a>！</div>  .element{width:960px;margin:0 auto;}  The above codes set the width of the div block and horizontally center align it. It's very easy to implement. However, if we have some elements we don;t know their width and we still want to...

   HTML,CSS,Center align,Unknown width     2012-07-11 12:55:00

  Mutli-inheritance bug between python 2.7 and 3.7

When we have run a py3.7 code under py2.x or a py2.x code under 3.x ,if a class do mutli-inheritance from 2 parent and the 2 parents also got inheritance from same parent, the different way to handle inheritance chain between python 2 and 3 will cause some running time bug: Assume we got this sample program inheritTest.py : # Purpose: Test mutli-inheritance different between python2 and 3 # Author: Yuancheng Liu # Created: 2019/05/16 class A: def getVal(self): print("cal...

   PYTHON,PYTHON 3,INHERITANCE     2019-05-16 08:33:52

  Lasagna Code

Anyone who claims to be even remotely versed in computer science knows what “spaghetti code” is. That type of code still sadly exists. But today we also have, for lack of a better term — and sticking to the pasta metaphor — “lasagna code”.Lasagna Code is layer upon layer of abstractions, objects and other meaningless misdirections that result in bloated, hard to maintain code all in the name of “clarity”. It drives me nuts to see how badly some c...

   Lasagna Code,Analysis,spaghetti code     2011-11-16 03:12:03

  Can we believe our eyes?

Several days ago, one of our customers submitted a sample (SHA1: fbe71968d4c5399c2906b56d9feadf19a35beb97, detected as TrojanDropper:Win32/Vundo.L). This trojan hijacks  the hosts “vk.com” and “vkontakte.ru” (both social networking sites in Russia)and redirects them to 92.38.209.252, but achieves this in an unusual way. A common  method used to hijack a website and redirect it to a site of the attacker’s choice is to add an entry in the Windows hosts f...

   Window,Software,Eye,Weired     2011-08-22 12:12:16

  Top 3 Cybersecurity Trends to Watch Out for Today

One trend in cybersecurity that never changes is that it’s getting more important with every passing year. According to statistics, the number of cyberattacks and severity of the losses they incur are growing at an alarming rate. Every day about 24,000 of malicious mobile apps get blocked yet more pop up overnight. For a business today cybersecurity isn’t an option, it’s a necessary measure one needs to invest in heavily. And it’s essential to follow the trends and develo...

   SECURITY,CYBER SECURITY     2019-05-14 09:03:24

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