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Encoding Video

Installing

Install FFmpeg with homebrew. You'll need to install it with a couple flags for webm and the AAC audio codec.

brew install ffmpeg --with-libvpx --with-libvorbis --with-fdk-aac --with-opus

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

You can get the list of installed codecs with:

lanetix=# \d foo
           Table "scripting.foo"
 Column |         Type          | Modifiers 
--------+-----------------------+-----------
 id     | integer               | not null
 a      | character varying(40) | not null
 b      | character varying(40) | not null
 c      | character varying(40) | not null

Sample config for 2 million web socket connection

    sysctl -w fs.file-max=12000500
    sysctl -w fs.nr_open=20000500
    # Set the maximum number of open file descriptors
    ulimit -n 20000000

    # Set the memory size for TCP with minimum, default and maximum thresholds 
 sysctl -w net.ipv4.tcp_mem='10000000 10000000 10000000'

lanetix=# \d foo
           Table "scripting.foo"
 Column |         Type          | Modifiers 
--------+-----------------------+-----------
 id     | integer               | not null
 a      | character varying(40) | not null
 b      | character varying(40) | not null
 c      | character varying(40) | not null

	# webm
	ffmpeg -i IN -f webm -vcodec libvpx -acodec libvorbis -ab 128000 -crf 22 -s 640x360 OUT.webm

	# mp4
	ffmpeg -i IN -acodec aac -strict experimental -ac 2 -ab 128k -vcodec libx264 -vpre slow -f mp4 -crf 22 -s 640x360 OUT.mp4

	# ogg (if you want to support older Firefox)
	ffmpeg2theora IN -o OUT.ogv -x 640 -y 360 --videoquality 5 --audioquality 0 --frontend

	/*

	convertVideo_config: {
	ffmpeg: 'bin/ffmpeg/./ffmpeg',
	mp4: '-vcodec libx264',
	m4v: '-vcodec libx264',
	'3gp': '-acodec libvo_aacenc -vcodec libx264',
	webm: '-acodec libvorbis -vcodec libvpx',
	ogv: '-acodec libvorbis'
	},

	-- Decoding
	SELECT CONVERT_FROM(DECODE(field, 'BASE64'), 'UTF-8') FROM table;

	-- Encoding
	SELECT ENCODE(CONVERT_TO(field, 'UTF-8'), 'base64') FROM table;

	[ { "gentilico" : "afegãne",
	"nome_pais" : "Afeganistão",
	"nome_pais_int" : "Afghanistan",
	"sigla" : "AF"
	},
	{ "gentilico" : "sul-africana",
	"nome_pais" : "África do Sul",
	"nome_pais_int" : "South Africa",
	"sigla" : "ZA"
	},

	/*
	https://www.smashingmagazine.com/2016/07/improving-user-flow-through-page-transitions/

	You can copy paste this code in your console on smashingmagazine.com
	in order to have cross-fade transition when change page.
	*/

	var cache = {};
	function loadPage(url) {
	if (cache[url]) {