CHANG-NING TSAI crazyguitar

Using the ssh agent

The following would show a similar output if a key is already added to your agent, and you are good to go.

$ ssh-add -l
2048 d7:8e:3d:03:9c:4f:f8:9d:04:0f:11:c5:24:e1:2f:3a rsa w/o comment (RSA)

The following will show if no agent is running.

SSH Forwarding on MacOS X

Forwarding SSH agent

Configure ~/.ssh/config

# Allow Agent forwarding for a specific host (by security)
Host remotehost
  ForwardAgent yes

Changing playback sound speed in realtime with python and multiprocessing

This is a script to change the sound speed in real time like for example background music in pygame.

The script generates the raw data of a sound file each time there is space in the queue. The sample will scale to the desired speed which you can modify with sound_Factor.

To play the music, you just need to get buffers from the queue and pass them to your music stream. Exemple for pygame :

# musique update
if channel.get_queue() == None:

ffmpeg

Converting Audio into Different Formats / Sample Rates

Minimal example: transcode from MP3 to WMA:
ffmpeg -i input.mp3 output.wma

You can get the list of supported formats with:
ffmpeg -formats

Convert WAV to MP3, mix down to mono (use 1 audio channel), set bit rate to 64 kbps and sample rate to 22050 Hz:

using Ansible command line:

ansible-playbook --connection=local 127.0.0.1 playbook.yml

using inventory:

127.0.0.1 ansible_connection=local

	# files/env:
	Defaults env_keep += "SSH_AUTH_SOCK"

	# tasks/main.yml
	- name: ensure sudo keeps SSH_AUTH_SOCK in environment
	copy: src=env
	dest=/etc/sudoers.d/env
	mode=0440
	owner=root
	group=root

	"""
	This gist shows how to run asyncio loop in a separate thread.
	It could be useful if you want to mix sync and async code together.
	Python 3.7+
	"""
	import asyncio
	from datetime import datetime
	from threading import Thread
	from typing import Tuple, List, Iterable

	"""Simple demo of using Flask with aiohttp via aiohttp-wsgi's
	WSGIHandler.

	"""

	import asyncio
	from aiohttp import web
	from aiohttp_wsgi import WSGIHandler
	from flask import Flask, render_template

	#define BOOST_RESULT_OF_USE_DECLTYPE

	#include <chrono>
	#include <thread>
	#include <boost/mpi.hpp>

	#include <iostream>
	#include <sstream>

	#include <utility>

	#ifndef __CONSUMERPRODUCERQUEUE_H__
	#define __CONSUMERPRODUCERQUEUE_H__

	#include <queue>
	#include <mutex>
	#include <condition_variable>

	/*
	* Some references in order
	*