Microtribute

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:

Elm best practices

Style guide

A vision for data interchange in Elm

How do you send information between clients and servers? What format should that information be in? What happens when the server changes the format, but the client has not been updated yet? What happens when the server changes the format, but the database cannot be updated?

These are difficult questions. It is not just about picking a format, but rather picking a format that can evolve as your application evolves.

Literature Review

By now there are many approaches to communicating between client and server. These approaches tend to be known within specific companies and language communities, but the techniques do not cross borders. I will outline JSON, ProtoBuf, and GraphQL here so we can learn from them all.

Should be work with 0.18

Destructuring(or pattern matching) is a way used to extract data from a data structure(tuple, list, record) that mirros the construction. Compare to other languages, Elm support much less destructuring but let's see what it got !

Tuple

myTuple = ("A", "B", "C")
myNestedTuple = ("A", "B", "C", ("X", "Y", "Z"))

	<?php

	namespace AppBundle\Entity;

	use Doctrine\ORM\Mapping as ORM;
	use AppBundle\Validator\Constraints\NotOverlapping;

	/**
	* @NotOverlapping("period")
	*/

	@font-face {
	font-family: SegoeUI;
	src:
	local("Segoe UI Light"),
	url(//c.s-microsoft.com/static/fonts/segoe-ui/west-european/light/latest.woff2) format("woff2"),
	url(//c.s-microsoft.com/static/fonts/segoe-ui/west-european/light/latest.woff) format("woff"),
	url(//c.s-microsoft.com/static/fonts/segoe-ui/west-european/light/latest.ttf) format("truetype");
	font-weight: 100;
	}

	function (user, context, callback) {
	user.app_metadata = user.app_metadata \|\| {};

	if ('stripe_customer_id' in user.app_metadata) {
	context.idToken['https://example.com/stripe_customer_id'] = user.app_metadata.stripe_customer_id;
	return callback(null, user, context);
	}

	var stripe = require('stripe')('sk_....');
	var customer = {

	<?php

	namespace FrontEndBundle\Request\ParamConverter;

	use Doctrine\Bundle\DoctrineBundle\Registry;
	use Doctrine\Common\Persistence\ObjectRepository;
	use Sensio\Bundle\FrameworkExtraBundle\Configuration\ParamConverter;
	use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;

	abstract class AbstractBySlugAndActiveSearcher

	class Book<P> {
	String title;
	public Book(String s) {
	title = s;
	}
	}

	interface Biography {}
	interface Comic {}

	module GameState
	exposing
	( Game(..)
	, GameDefinition
	, PlayState
	, loading
	, updateGameDefinition
	, updatePlayState
	, updateScore
	, toReady