Adrian Fedoreanu phedoreanu

Project Title

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Getting Started

These instructions will get you a copy of the project up and running on your local machine for development and testing purposes. See deployment for notes on how to deploy the project on a live system.

Prerequisites

compile ffmpeg for arm https://github.com/fiorix/ffmpeg-arm
create youtube 'live event'. get rtmp url + session id
run this:

raspivid -o - -t 0 -vf -hf -fps 30 -b 6000000 | ffmpeg -re -ar 44100 -ac 2 -acodec pcm_s16le -f s16le -ac 2 -i /dev/zero -f h264 -i - -vcodec copy -acodec aac -ab 128k -g 50 -strict experimental -f flv rtmp://a.rtmp.youtube.com/live2/<SESSION>

you can tweak -b and -fps to your liking. the settings above work well for 1080p. by not specifying width or height we get the full 1920x1080 resolution from the raspi camera

Git Cheat Sheet

Commands

Getting Started

git init

or

ArchLinux Installation guide

This will use GPT partitions and GRUB2 on a BIOS enabled PC (see Wiki for EFI). The Installation Guide can be found at /root/install.txt.

Prepare USB stick

Get 2012.08.04 image or later from http://www.archlinux.org/download. Following tutorial requires at least 2011.07.15 image.

dd if=/dev/zero of=/dev/sdx bs=1k count=1

	#!/bin/bash
	#Youtube-DL DASH Video and Audio merging script
	#Written by QuidsUp
	#Edited by Christoph Korn
	#Edited by William Leung

	File1New=video.mp4
	File2New=audio.m4a

	URL=$1

	# Create your superuser
	$ mongo
	> use admin
	> db.createUser({user:"someadmin",pwd:"secret", roles:[{role:"root",db:"admin"}]})
	> exit

	# Alias for convenience (optional and at your own risk)
	$ echo 'alias mongo="mongo --port 27017 -u someadmin -p secret --authenticationDatabase admin"' >> ~/.bash_profile
	$ source ~/.bash_profile

	#EXTM3U
	#EXTINF:-1,BBC - Radio 1
	http://bbcmedia.ic.llnwd.net/stream/bbcmedia_radio1_mf_p
	#EXTINF:-1,BBC - Radio 2
	http://bbcmedia.ic.llnwd.net/stream/bbcmedia_radio2_mf_p
	#EXTINF:-1,BBC - Radio 3
	http://open.live.bbc.co.uk/mediaselector/5/select/version/2.0/mediaset/http-icy-aac-lc-a/format/pls/vpid/bbc_radio_three.pls
	#EXTINF:-1,BBC - Radio 4
	http://bbcmedia.ic.llnwd.net/stream/bbcmedia_radio4fm_mf_p
	#EXTINF:-1,BBC - Radio 5 live

	Latency Comparison Numbers (~2012)
	----------------------------------
	L1 cache reference 0.5 ns
	Branch mispredict 5 ns
	L2 cache reference 7 ns 14x L1 cache
	Mutex lock/unlock 25 ns
	Main memory reference 100 ns 20x L2 cache, 200x L1 cache
	Compress 1K bytes with Zippy 3,000 ns 3 us
	Send 1K bytes over 1 Gbps network 10,000 ns 10 us
	Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD

	# to generate your dhparam.pem file, run in the terminal
	openssl dhparam -out /etc/nginx/ssl/dhparam.pem 2048