alxhub

What are Service Workers (and why might you want one)?

Service Workers are a new technology in modern web browsers. They augment the normal web deployment model and empower applications to deliver reliability and performance on par with natively installed code.

Service Workers have many different capabilities, but the most important is their function as a network proxy. They intercept all outgoing HTTP requests made by the application and can choose how to respond to them. For example, they can query a local cache and deliver a cached response if one is available. Proxying isn't limited to requests made through programmatic APIs (such as fetch), but includes resources referenced in HTML and even the initial request to index.html itself. Service Worker-based caching is thus completely programmable, and doesn't rely on server-specified caching headers.

Unlike the other scripts which make up an application (such as the Angular app bundle), the Service Worker is preserved after the user closes the tab. T

ben-cohen

/*
 * shared_mutex: Mutex in mmap memory shared between processes.
 *
 * Ben Cohen, July 2017.
 *
 * Compile using:
 *    gcc -o shared_mutex shared_mutex.c -ggdb -Wall -std=c99 -pthread
 *
 * Two processes are created with an mmap shared memory region
 * containing an array of chars and a mutex.  The mutex is created with

Brainiarc7

Streaming your Linux desktop to Youtube and Twitch via Nvidia's NVENC and VAAPI:

Considerations to take when live streaming:

The following best practice observations apply when using a hardware-based encoder for live streaming to any platform:

1. Set the buffer size (-bufsize:v) equal to the target bitrate (-b:v). You want to ensure that you're encoding in CBR mode.

2. Set up the encoders as shown:

laziel

var ctx = null, usingWebAudio = true;

try {
  if (typeof AudioContext !== 'undefined') {
      ctx = new AudioContext();
  } else if (typeof webkitAudioContext !== 'undefined') {
      ctx = new webkitAudioContext();
  } else {
      usingWebAudio = false;
  }

spinxz

# Vncserver service file for Debian or Ubuntu with systemd
#
#  Install vncserver and tools
#  e.g. apt-get install tightvncserver autocutsel gksu
#
# 1. Copy this file to /etc/systemd/system/vncserver@:1.service
# 2. Edit User=
#    e.g "User=paul"
# 3. Edit the vncserver parameters appropriately in the ExecStart= line!
#    e.g. the -localhost option only allows connections from localhost (or via ssh tunnels)

v0lkan

user web;

# One worker process per CPU core.
worker_processes 8;

# Also set
# /etc/security/limits.conf
#   web soft nofile 65535
#   web hard nofile 65535
# /etc/default/nginx

ddennedy

See my DASH-IF presentation from October, 2014:
https://s3.amazonaws.com/misc.meltymedia/dash-if-reveal/index.html#/

1. encode multiple bitrates with keyframe alignment:
   ffmpeg -i ~/Movies/5D2_Portrait.MOV -s 1280x720 -c:v libx264 -b:v 1450k -bf 2 \
     -g 90 -sc_threshold 0 -c:a aac -strict experimental -b:a 96k -ar 32000 out.mp4

   My input was 30 fps = 3000 ms. If it were 29.97, then a GOP size of 90 frames will yield a base segment
   size of 3003 milliseconds. You can make the segment size some multiple of this, e.g.: 6006, 9009, 12012.

bradmontgomery

Setting up a SSL Cert from Comodo

I use Namecheap.com as a registrar, and they resale SSL Certs from a number of other companies, including Comodo.

These are the steps I went through to set up an SSL cert.

Purchase the cert

mrenouf

#!/bin/bash

ADB="/home/mrenouf/bin/adb"

# We need root on the host to mess with networking
if [[ $(whoami) != "root" ]]; then
  echo "You must be root to run this script!"
  exit 1
fi;

unhammer

#! /usr/bin/python2
import gtk.gdk
w = gtk.gdk.window_foreign_new( gtk.gdk.get_default_root_window().property_get("_NET_ACTIVE_WINDOW")[2][0] )
w.set_decorations( (w.get_decorations()+1)%2 ) # toggle between 0 and 1
gtk.gdk.window_process_all_updates()
gtk.gdk.flush()

# now bind this to super-r or something