MohamedAlaa

Remove white background color of an image in ImageMagick

$ convert  your.jpg  -transparent white  your.png

Flatten a transparent image with a white background:

mikelehen

/**
 * Fancy ID generator that creates 20-character string identifiers with the following properties:
 *
 * 1. They're based on timestamp so that they sort *after* any existing ids.
 * 2. They contain 72-bits of random data after the timestamp so that IDs won't collide with other clients' IDs.
 * 3. They sort *lexicographically* (so the timestamp is converted to characters that will sort properly).
 * 4. They're monotonically increasing.  Even if you generate more than one in the same timestamp, the
 *    latter ones will sort after the former ones.  We do this by using the previous random bits
 *    but "incrementing" them by 1 (only in the case of a timestamp collision).
 */

pgburt

Recording

• Set Audacity to use the External mic.
• Ensure you're recording in 16-bit PCM + 44100Hz.
• Do a sound check, record everyone in the room speaking. You want the lighter part of the meter bar (the green or red bar at the top) to bounce between -12db and -6db while people are talking. It's hard to achieve this... so just settle for as close as you can get, without the bars going off the scale :)
• Play it back and tweak levels until it sounds good @ 60% speaker volume.
• Save the Project BEFORE recording live :D (prevents quality issues)

Edit for Content

• Join recordings to one track.
• Listen to it + Edit bad content out.

dbussert

var child_process = require('child_process'),
	http = require('http');
	url = require('url'),
	ffmpeg = null;
    
var livestream = function (req, resp) {
    // For live streaming, create a fragmented MP4 file with empty moov (no seeking possible).

	var input = 'udp://225.1.1.1:8208';

ancymathai

<?php
$a=$_REQUEST['txt1'];
$b=$_REQUEST['txt2'];



class compareImages
{
	private function mimeType($i)

n-johnson

_dig() {
  local domain=$1;
  local type=$2;

  dig "$domain" -t "$type" \
    | sed -n '/;; ANSWER SECTION/,/^$/p' \
    | sed '1d' \
    | sed '/^$/d';
}

n-johnson

# req: prips

curl https://ip-ranges.amazonaws.com/ip-ranges.json \
  | grep -B 2 CLOUDFRONT \
  | grep 'ip_prefix' \
  | awk '{ print $2 }' \
  | tr -d '",' \
  | xargs -I{} prips {}

n-johnson

Latency Comparison Numbers
--------------------------
L1 cache reference                            0.5 ns
Branch mispredict                             5   ns
L2 cache reference                            7   ns             14x L1 cache
Mutex lock/unlock                            25   ns
Main memory reference                       100   ns             20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy              3,000   ns
Send 1K bytes over 1 Gbps network        10,000   ns    0.01 ms
Read 4K randomly from SSD*              150,000   ns    0.15 ms

rgbkrk

Lodash has a sweet feature called a mixin that lets you alias function names. Below here I alias names that we're used to using in SQL to (roughly) equivalent functions in lodash.

_.mixin({
  select: _.map,
  from: _.chain,
  where: _.filter,
  groupBy: _.sortByOrder,
})

toshsan

/** @jsx hype */

function render(root, el) {
	while (root.lastChild) {
		root.removeChild(root.lastChild);
	}
	root.appendChild(el);
}

function hype(name, attributes, ...children) {