SalimF

Low-Latency Live Streaming for your Desktop using ffmpeg and netcat:

Preamble:

In this post I will explore how to stream a video and audio capture from one computer to another using ffmpeg and netcat, with a latency below 100ms, which is good enough for presentations and general purpose remote display tasks on a local network.

The problem:

Streaming low-latency live content is quite hard, because most software-based video codecs are designed to achieve the best compression and not best latency. This makes sense, because most movies are encoded once and decoded often, so it is a good trade-off to use more time for the encoding than the decoding.

Live Transcoding

This is a collection of working commandline examples to show how one could use FFMpeg and VLC for live transcoding of video streams. All examples have been tested on OSX 10.7.5 with FFMPeg 1.1.3 and VLC 2.0.5 in early 2013.

Documentation links

	#!/usr/bin/python
	# -- coding: utf-8 --

	"""Python Spintax parser

	This module provides an efficient spintax parser where every possible spuns have the same probability.
	Given a masterspin you can get the total number of possible spuns or a randomly chosen spun.

	"""

	#! /bin/sh

	# update glibc to 2.17 for CentOS 6

	wget http://copr-be.cloud.fedoraproject.org/results/mosquito/myrepo-el6/epel-6-x86_64/glibc-2.17-55.fc20/glibc-2.17-55.el6.x86_64.rpm
	wget http://copr-be.cloud.fedoraproject.org/results/mosquito/myrepo-el6/epel-6-x86_64/glibc-2.17-55.fc20/glibc-common-2.17-55.el6.x86_64.rpm
	wget http://copr-be.cloud.fedoraproject.org/results/mosquito/myrepo-el6/epel-6-x86_64/glibc-2.17-55.fc20/glibc-devel-2.17-55.el6.x86_64.rpm
	wget http://copr-be.cloud.fedoraproject.org/results/mosquito/myrepo-el6/epel-6-x86_64/glibc-2.17-55.fc20/glibc-headers-2.17-55.el6.x86_64.rpm

	sudo rpm -Uvh glibc-2.17-55.el6.x86_64.rpm \

	#!/usr/bin/env python
	# desktop background as web page using webkit and proxy settings
	# https://kmandla.wordpress.com/2010/05/24/the-1-2kb-python-browser-script/
	# - proxy support is included in webkit no need of -- http://stackoverflow.com/questions/6915840/python-webkit-with-proxy-support
	# http://superuser.com/questions/419195/set-an-html-page-as-the-wallpaper-on-linux

	import sys
	import gtk
	import webkit
	import webbrowser

	###########
	paste this inside virtual host file /etc/nginx/sites-available/<YOUR CONFIG FILE>
	###########

	server {
	listen 80;

	server_name <DOMAIN_OR_HOST_NAME>;
	root /var/www/html/<FOLDER_NAME>;

	yum install 3proxy;
	curl https://gist.githubusercontent.com/AntonOrlov/a70aeed276d35dc9d77060b0a6c167ed/raw -o /etc/3proxy.cfg;
	chmod 644 /etc/3proxy.cfg;
	firewall-cmd --zone=public --add-port=8080/tcp --permanent
	firewall-cmd --zone=public --add-port=9000/tcp --permanent
	systemctl enable 3proxy.service;
	systemctl restart 3proxy.service;

	#!/usr/bin/env python
	# -- coding: utf-8 --

	# Python bot for comment a list of urls in YouTube

	import time
	import numpy as np
	from selenium import webdriver
	from selenium.webdriver.common.by import By
	from selenium.webdriver.support.ui import WebDriverWait

	# If the server has ffmpeg:
	## For the server:
	ffmpeg -f fbdev -i /dev/fb0 -f avi pipe:1 \| nc -l -p 1234
	## For the viewer:
	nc 127.0.0.1 1234 \| ffplay -i pipe:0

	# If the server doesn't have ffmpeg:
	## For the server:
	sudo cat /dev/fb0 \| nc -l -p 1234
	## For the viewer (replace 1920x1080 with the server's resolution):

	#/usr/bin/python
	# if yes or no doesn't work try using quotes
	# example 'yes' or 'no'



	import os
	import sys