ianchen06

#!/bin/sh -x

# ================================== 
# iptables default configuration script
#
# - this locks down our servers port access
# ==================================

# install fail2ban
sudo apt-get update

ianchen06

#
# CORS header support
#
# One way to use this is by placing it into a file called "cors_support"
# under your Nginx configuration directory and placing the following
# statement inside your location block(s):
#
#   include cors_support;
#
# A limitation to this method is that Nginx doesn't currently send headers

ianchen06

How to:

Fix pseudo-streaming videos by moving Moov Atom

Relies on some *nix CLI utilities: mediainfo; and qt-faststart (part of ffmpeg). I used homebrew to install them on OS X.

What is pseudo-streaming?

Pseudo streaming is simply a video that can start playing before it's fully dowmloaded. The videos are not streaming but rather progressively downloaded. What's important is that the file metadata (the Moov Atom) is at the start of the file rather than at the end. Usually this is an option set when encoding the file (called quick start or web start). If the files have not been encoded this way you can either re-encode or use a utility to move the Moov Atom. Re-encoding takes much longer than using a utility to move the Moov Atom so here's how to do it.

Steps

First check with mediainfo to see if video 'is streamable':

ianchen06

#!/bin/bash  
# Full path to tc binary 

TC=$(which tc)

#
# NETWORK CONFIGURATION
# interface - name of your interface device
# interface_speed - speed in mbit of your $interface
# ip - IP address of your server, change this if you don't want to use

ianchen06

EptiMecha

example on how to use mechanize with cookie jars, basically:

agent.cookie_jar.save_as "cookies.yml"
agent.cookie_jar.load "cookies.yml"

to try it:

• download this zip

ianchen06

########################################
#
# Nginx 1.8.0
# Pagespeed v.1.9.32.6
# OpenSSL 1.0.2d
# - Tested on Ubuntu 14.4.2
#
########################################

ianchen06

# Feel free to change this path of course (and keys_zone value as well, but also change the usage of it below).
proxy_cache_path /var/www/cache/resized levels=1:2 keys_zone=resizedimages:10m max_size=1G;

# Gzip was on in another conf file of mine...You may need to uncomment the next line.
#gzip on;
gzip_disable msie6;
gzip_static on;
gzip_comp_level 4;
gzip_proxied any;
# Again, be careful that you aren't overwriting some other setting from another config's http {} section.

ianchen06

"""
This python script encodes all files that have the extension mkv in the current
working directory.

Sources:
    http://ffmpeg.org/trac/ffmpeg/wiki/x264EncodingGuide
"""
import subprocess, os

#-------------------------------------------------------------------------------

ianchen06

See my DASH-IF presentation from October, 2014:
https://s3.amazonaws.com/misc.meltymedia/dash-if-reveal/index.html#/

1. encode multiple bitrates with keyframe alignment:
   ffmpeg -i ~/Movies/5D2_Portrait.MOV -s 1280x720 -c:v libx264 -b:v 1450k -bf 2 \
     -g 90 -sc_threshold 0 -c:a aac -strict experimental -b:a 96k -ar 32000 out.mp4

   My input was 30 fps = 3000 ms. If it were 29.97, then a GOP size of 90 frames will yield a base segment
   size of 3003 milliseconds. You can make the segment size some multiple of this, e.g.: 6006, 9009, 12012.

ianchen06

Video conversion with FFmpeg

Install

On mac:

1. Download the latest release.
2. Extract the binary and place it in /usr/local/bin.

Command basics