charly-vega

This demo builds on previous gists in this series to render an audio-modulated WebGL animation, and output a 48 FPS, 1080p, HD video utilizing:

• HTML5's Web Audio API for analysing an audio file.
• HTML5's Web Worker API for offloading communications between the web page and the server to separate thread.
• Socket.io for sending messages (including image and audio files) between client and server.
• Node.js for the server process for storing generated images and uploaded audio and creating the final video.
• FFMpeg for the actual video creation.
• Fluent-ffmpeg for making the configuration and execution of FFMpeg commands easy peasy.
• @ffmpeg-installer/ffmpeg for installing the correct version of FFMpeg for the hardware this demo runs on.
• mkdirp for creating the folder path for each client's data, including any missing nodes in the path.

charly-vega

sudo yum -y install freetype freetype-devel libpng-devel
sudo yum -y install mesa-libGLU-devel
sudo yum -y install libX11-devel mesa-libGL-devel perl-Time-HiRes
sudo yum -y install libXtst libXrender

# Insert any url for Linux 64 bit blender
# https://builder.blender.org/download/
wget 'https://builder.blender.org/download/blender-2.78-81d7ff84769-linux-glibc219-x86_64.tar.bz2'
tar -jxvf blender*.tar.bz2

charly-vega

sudo yum update -y
# load the latest kernel version, really dont skip this
sudo reboot

# http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/accelerated-computing-instances.html#install-nvidia-driver
sudo yum install -y gcc kernel-devel-`uname -r`

wget http://us.download.nvidia.com/XFree86/Linux-x86_64/375.66/NVIDIA-Linux-x86_64-375.66.run
sudo /bin/bash ./NVIDIA-Linux-x86_64-375.66.run --no-drm

charly-vega

# Heavily depends on:
# libqrencode (fukuchi.org/works/qrencode/)
# paperkey (jabberwocky.com/software/paperkey/)
# zbar (zbar.sourceforge.net)

# Producing the QR codes:
# Split over 4 codes to ensure the data per image is not too large.
gpg --export-secret-key KEYIDGOESHERE | paperkey --output-type raw | base64 > temp
split temp -n 4 IMG
for f in IMG*; do cat $f | qrencode -o $f.png; done

charly-vega

import bpy

# https://blender.stackexchange.com/questions/5281/blender-sets-compute-device-cuda-but-doesnt-use-it-for-actual-render-on-ec2
bpy.context.user_preferences.addons['cycles'].preferences.compute_device_type = 'CUDA'
bpy.context.user_preferences.addons['cycles'].preferences.devices[0].use = True

bpy.context.scene.cycles.device = 'GPU'

bpy.data.scenes["Scene"].render.filepath = "/tmp/output.png"
bpy.ops.render.render(write_still=True)

charly-vega

Getting the code

git clone https://gist.github.com/08be90a2f21205062ccc.git

Executing the code

$ npm install # maybe npm start will take care of it but just in case
$ npm start && open out.png

> offscreen-sample@1.0.0 start /Users/bsergean/src/offscreen_sample

charly-vega

Client-side SSL

For excessively paranoid client authentication.

Using self-signed certificate.

Create a Certificate Authority root (which represents this server)

Organization & Common Name: Some human identifier for this server CA.

openssl genrsa -des3 -out ca.key 4096
openssl req -new -x509 -days 365 -key ca.key -out ca.crt

charly-vega

-- show running queries (pre 9.2)
SELECT procpid, age(query_start, clock_timestamp()), usename, current_query 
FROM pg_stat_activity 
WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%' 
ORDER BY query_start desc;

-- show running queries (9.2)
SELECT pid, age(query_start, clock_timestamp()), usename, query 
FROM pg_stat_activity 
WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%' 

charly-vega

Every so often I have to restore my gpg keys and I'm never sure how best to do it. So, I've spent some time playing around with the various ways to export/import (backup/restore) keys.

Method 1

Backup the public and secret keyrings and trust database

cp ~/.gnupg/pubring.gpg /path/to/backups/
cp ~/.gnupg/secring.gpg /path/to/backups/
cp ~/.gnupg/trustdb.gpg /path/to/backups/

or, instead of backing up trustdb...

charly-vega

#!/bin/bash

# Copyright 2017 Théo Chamley
# Permission is hereby granted, free of charge, to any person obtaining a copy of 
# this software and associated documentation files (the "Software"), to deal in the Software
# without restriction, including without limitation the rights to use, copy, modify, merge,
# publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
# to whom the Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all copies or