devadvance

ffmpeg -ss $INPUT_START_TIME -t $LENGTH -i $INPUT_FILENAME \
-vf "fps=$OUTPUT_FPS,scale=$OUTPUT_WIDTH:-1:flags=lanczos,split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse" \
-loop $NUMBER_OF_LOOPS $OUTPUT_FILENAME

# Change these placeholders:
# * $INPUT_START_TIME - number of seconds in the input video to start from.
# * $LENGTH - number of seconds to convert from the input video.
# * $INPUT_FILENAME - path to the input video.
# * $OUTPUT_FPS - ouput frames per second. Start with `10`.
# * $OUTPUT_WIDTH - output width in pixels. Aspect ratio is maintained.

matusnovak

Matrix

matrix.org chat is split into two parts, the server and the client. The server we are going to use is called Synapse and the client is Riot.im. The Synapse will also need Postgres database and Redis for caching.

0. Folders

Make sure your folder structure looks like this.

example/

frenck

---
esphome:
  name: doorbell
  platform: ESP8266
  board: esp01_1m

# WiFi connection, correct these
# with values for your WiFi.
wifi:
  ssid: !secret wifi_ssid

huntrar

Arch Linux Full-Disk Encryption Installation Guide

This guide provides instructions for an Arch Linux installation featuring full-disk encryption via LVM on LUKS and an encrypted boot partition (GRUB) for UEFI systems.

Following the main installation are further instructions to harden against Evil Maid attacks via UEFI Secure Boot custom key enrollment and self-signed kernel and bootloader.

Preface

You will find most of this information pulled from the Arch Wiki and other resources linked thereof.

Note: The system was installed on an NVMe SSD, substitute /dev/nvme0nX with /dev/sdX or your device as needed.

lizthegrey

default['sshd']['sshd_config']['AuthenticationMethods'] = 'publickey,keyboard-interactive:pam'
default['sshd']['sshd_config']['ChallengeResponseAuthentication'] = 'yes'
default['sshd']['sshd_config']['PasswordAuthentication'] = 'no'

cbeuw

#!/usr/bin/env bash

# Forked and modified by cbeuw from https://github.com/teddysun/shadowsocks_install/blob/master/shadowsocks-all.sh

PATH=$PATH:/usr/local/bin
export PATH

red='\033[0;31m'
green='\033[0;32m'
yellow='\033[0;33m'

ryderdamen

Uploading Files from Google Compute Engine (GCE) VMs to Google Cloud Storage (GCS)

I had a bit of trouble trying to configure permissions to upload files from my Google Compute Engine instance to my Google Cloud Storage bucket. The process isn't as intuitive as you think. There are a few permissions issues that need to be configured before this can happen. Here are the steps I took to get things working.

Let's say you want to upload yourfile.txt to a GCS bucket from your virtual machine. You can use the gsutil command line tool that comes installed on all GCE instances.

If you've never used the gcloud or gsutil command line tools on this machine before, you will need to initialize them with a service account.

mrpeardotnet

Proxmox PVE 6.x Post Installation Steps

This cheatsheet helps to set up your Proxmox Virtual Environment (PVE) host after fresh installation. Designed and tested on PVE version 6.x.

Note about sudo

I do not prepend sudo command to any of commands listed here, but keep in mind that nearly all commands requires su privileges, so use sudo if your account happen to not have root access.

How to edit config files

The simplest way to edit config file is to use vim.tiny editor, for example to edit vzdump.conf file use this command:

00001101-xt

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

Convert WAV to MP3, mix down to mono (use 1 audio channel), set bit rate to 64 kbps and sample rate to 22050 Hz:

lxe

Receive GOES-16 and GOES-17 Images with a Raspberry Pi and RTL-SDR dongle

Also see the original Pieter Noordhuis's guide

Hardware

You need:

1. Raspberry Pi Model B (or B+) with a MicroSD Card $35-40
2. An RTL-SDR dongle: