Sushant J sushant-j

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 :)

HTML Code Standards

1. HTML Attribute Ordering

HTML element attributes _must_ appear in following order:

HTML Native

class

id, name

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.

Element APIs

Getting box metrics

elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent

Note: I'm currently taking a break from this course to focus on my studies so I can finally graduate

	// FizzBuzz solution with one comparison:
	// Bitwise operations, using predefined 0-15 numbers mask

	// live demo: http://jsfiddle.net/TbAuQ/
	// source: http://www.zoharbabin.com/which-fizzbuzz-solution-is-the-most-efficient

	var words = [undefined, "Fizz", "Buzz", "FizzBuzz"],
	mask = 810092048, //11 00 00 01 00 10 01 00 00 01 10 00 01 00 00
	c = 0;

	- (UIImage )compressImage:(UIImage )image{
	float actualHeight = image.size.height;
	float actualWidth = image.size.width;
	float maxHeight = 600.0;
	float maxWidth = 800.0;
	float imgRatio = actualWidth/actualHeight;
	float maxRatio = maxWidth/maxHeight;
	float compressionQuality = 0.5;//50 percent compression

	if (actualHeight > maxHeight \|\| actualWidth > maxWidth) {

	#!/usr/bin/env python

	# Haversine formula example in Python
	# Author: Wayne Dyck

	import math

	def distance(origin, destination):
	lat1, lon1 = origin
	lat2, lon2 = destination

	history.replaceState && history.replaceState(
	null, '', location.pathname + location.search.replace(/[\?&]message=[^&]+/, '').replace(/^&/, '?')
	);