nanom1t

Video and audio encoding for playback in Android and iOS devices

This document aims to provide an easy way encode video optimized for playback in mobile devices that use the Android or the iOS operating systems.

libx264 is used for (single or two-pass) video encoding and libfdk_aac for audio encoding.

ffmpeg, libx264 and libfdk_aac settings are optimized for playback quality and compatibility on Android and iOS. There is extensive documentation and references for each of the settings used and contributions are very welcome :)

Loading variables from .env files in Ansible

Ansible has various ways of looking up data from outside sources, including plain text password files, CSV files and INI files. But it doesn't seem to have a lookup for .env files, as used in Laravel projects, also available for PHP, Ruby, Node.js, Python and others.

One option is to launch Ansible with the Ruby dotenv command line script... But that requires Ruby, which seems like overkill to me.

So here is a simpler solution that I use. It consists of:

The .env file itself
A small shell script that loads the .env file into environment variables - ansible-playbook.sh

	package main

	import (
	"context"
	"encoding/hex"
	"fmt"
	"github.com/ethereum/go-ethereum/accounts/abi"
	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/core/types"
	"github.com/ethereum/go-ethereum/ethclient"

	async function getConfirmations(txHash) {
	try {
	// Instantiate web3 with HttpProvider
	const web3 = new Web3('https://rinkeby.infura.io/')

	// Get transaction details
	const trx = await web3.eth.getTransaction(txHash)

	// Get current block number
	const currentBlock = await web3.eth.getBlockNumber()


	### Full command line options

	```
	ffmpeg -f gif -i FOO.gif -pix_fmt yuv420p -c:v libx264 -movflags +faststart -filter:v crop='floor(in_w/2)2:floor(in_h/2)2' BAR.mp4
	```

	### Notie

	* output mp4 is encoded with h264, support Firefox/Chrome/Safari in Windows, Mac OSX, Android, and iOS.

	// Code generated - DO NOT EDIT.
	// This file is a generated binding and any manual changes will be lost.

	package token

	import (
	"math/big"
	"strings"

	ethereum "github.com/ethereum/go-ethereum"


	#user nobody;
	worker_processes 4;

	#error_log logs/error.log;
	#error_log logs/error.log notice;
	#error_log logs/error.log info;

	#pid logs/nginx.pid;

	package main

	import (
	"crypto/aes"
	"crypto/cipher"
	"crypto/rand"
	"encoding/base64"
	"fmt"
	"io"
	)

	package main

	import (
	"crypto/ecdsa"
	"crypto/sha256"
	"encoding/hex"
	"fmt"
	"log"

	"github.com/mr-tron/base58"

	const TronWeb = require('tronweb');
	const HttpProvider = TronWeb.providers.HttpProvider;
	const fullNode = new HttpProvider("https://api.trongrid.io");
	// const fullNode = new HttpProvider("http://192.168.1.162:8090");
	const solidityNode = new HttpProvider("https://api.trongrid.io");
	const eventServer = new HttpProvider("https://api.trongrid.io");
	const privateKey = "3481E79956D4BD95F358AC96D151C976392FC4E3FC132F78A847906DE588C145";
	const tronWeb = new TronWeb(fullNode, solidityNode, eventServer, privateKey);