44213

# To extract the sound from a video and save it as MP3:
ffmpeg -i <video.mp4> -vn <sound>.mp3

# To convert frames from a video or GIF into individual numbered images:
ffmpeg -i <video.mpg|video.gif> <frame_%d.png>

# To combine numbered images (frame_1.jpg, frame_2.jpg, etc) into a video or GIF:
ffmpeg -i <frame_%d.jpg> -f image2 <video.mpg|video.gif>

# To quickly extract a single frame from a video at time mm:ss and save it as a 128x128 resolution image:

stevecondylios

How to Resize an Image in Github README.md (i.e. Github Flavored Markdown)

Percentage:

<img src="https://user-images.githubusercontent.com/16319829/81180309-2b51f000-8fee-11ea-8a78-ddfe8c3412a7.png" width=50% height=50%>

Pixels:

<img src="https://user-images.githubusercontent.com/16319829/81180309-2b51f000-8fee-11ea-8a78-ddfe8c3412a7.png" width="150" height="280">

shravan-kuchkula

Using Docker and docker-compose to manage Apache Airflow on mac

Using our beloved docker and docker-compose, we can very quickly bring up an Apache Airflow instance on our mac.

Contents of docker-compose.yml

About the only thing you need to customize in this docker-compose.yml file is the volumes section. This will tell docker to map the given directory containing your Airflow DAGs/plugins to container file system.

version: '3'
services:

animir

const http = require('http');
const express = require('express');
const Redis = require('ioredis');
const { RateLimiterRedis } = require('rate-limiter-flexible');
const redisClient = new Redis({ enableOfflineQueue: false });

const maxWrongAttemptsByIPperMinute = 5;
const maxWrongAttemptsByIPperDay = 100;

const limiterFastBruteByIP = new RateLimiterRedis({

fernandoaleman

Install RabbitMQ on CentOS 7

sudo yum -y install epel-release
sudo yum -y update

Install Erlang

Download repository

ruanbekker

#!/bin/bash

# variables
LOGFILE="/var/log/nginx/access.log"
LOGFILE_GZ="/var/log/nginx/access.log.*"
RESPONSE_CODE="200"

# functions
filters(){
grep $RESPONSE_CODE \

AbsoluteDestiny

Where to get FFMpeg

Windows

https://ffmpeg.zeranoe.com/builds/

OSX

https://evermeet.cx/ffmpeg/

wags

Arq stores backup data in a format similar to that of the open-source version
control system 'git'.  

Content-Addressable Storage
---------------------------
At the most basic level, Arq stores "blobs" using the SHA1 hash of the
contents as the name, much like git. Because of this, each unique blob is only
stored once. If 2 files on your system have the same contents, only 1 copy of
the contents will be stored. If the contents of a file change, the SHA1 hash is
different and the file is stored as a different blob.

carlhoerberg

var amqp = require('amqplib/callback_api');

// if the connection is closed or fails to be established at all, we will reconnect
var amqpConn = null;
function start() {
  amqp.connect(process.env.CLOUDAMQP_URL + "?heartbeat=60", function(err, conn) {
    if (err) {
      console.error("[AMQP]", err.message);
      return setTimeout(start, 1000);
    }

staltz

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

---