a1mzone / ffmpeg.md

Last active June 12, 2020 07:51 — forked from protrolium/ffmpeg.md

Cheatsheet - ffmpeg

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:

a1mzone / python.md

Last active January 5, 2024 08:27

Python

Compile

git clone https://github.com/python/cpython
git checkout <version>

./configure --enable-optimizations
make -j8
sudo make altinstall

a1mzone / bash.md

Last active July 13, 2020 08:32

Cheatsheet - BASH

BASH

Find Terminal

ps | grep $$
which 

!#/bin/terminal

Variables

a1mzone / gh.md

Last active January 4, 2024 11:12

GeoHash Sizing

GeoHash Size

1 ≤ 5,000km × 5,000km
2 ≤ 1,250km × 625km
3 ≤ 156km × 156km
4 ≤ 39.1km × 19.5km
5 ≤ 4.89km × 4.89km
6 ≤ 1.22km × 0.61km
7 ≤ 153m × 153m
8 ≤ 38.2m × 19.1m

a1mzone / superset-install.md

Last active December 13, 2022 18:35

Apache Superset - ubuntu 20.04 Install

Apache Superset - Ubuntu 20.04LTS

sudo apt-get install build-essential libssl-dev libffi-dev python3-dev python3-pip libsasl2-dev libldap2-dev default-libmysqlclient-dev  libpq-dev python3-dev

mkvirtualenv -p python3.8 superset-3.8

pip install --upgrade setuptools pip

pip install apache-superset==2.0.0

a1mzone / spatial_functions.md

Last active January 9, 2024 13:34

Spatial Queries

GeoMesa Spark

MakePolygon

ST_MakePolygon(ST_ExteriorRing(ST_Collect(
st_makepoint(28.1833495,-26.0544965),
st_makepoint(28.1837932,-26.0604524),
st_makepoint(28.1833495,-26.0544965))))

PolygonFromText

a1mzone / k8s.md

Last active January 23, 2024 11:17

K8S & Helm

HELM

Install

curl -fsSL -o get_helm.sh https://raw.githubusercontent.com/helm/helm/main/scripts/get-helm-3
chmod 700 get_helm.sh
./get_helm.sh

Add Repo

helm repo add bitnami https://charts.bitnami.com/bitnami
helm repo add superset https://apache.github.io/superset

a1mzone / zsh.md

Last active January 26, 2024 09:15

ZSH Setup

Basic ZSH Setup

sudo apt install git curl zsh

sh -c "$(curl -fsSL https://raw.githubusercontent.com/ohmyzsh/ohmyzsh/master/tools/install.sh)"

sed 's/robbyrussell/gnzh/' -i ~/.zshrc

# general

alias esrc='code ~/source/ohmyconfig/zshrc_config'

a1mzone / mlx.md

Last active June 21, 2024 19:58

Mellanox Flash

Download latest Mellanox Firmware tools

sudo apt update && sudo apt install gcc make dkms unzip linux-headers-$(uname -r)
wget https://www.mellanox.com/downloads/MFT/mft-4.18.0-106-x86_64-deb.tgz
tar -xvf mft-4.18.0-106-x86_64-deb.tgz && cd mft-4.18.0-106-x86_64-deb
sudo ./install.sh

Start MST service:

mst start
mst status

a1mzone / nifi.md

Last active April 10, 2025 14:45

NiFi

NiFi 2 - SNI ERROR 400 due to Jetty

Create a new PCKS12 keystore

keytool -genkeypair -alias nifi-cert -keyalg RSA -keysize 2048 -validity 365 -keystore keystore.p12 -storetype PKCS12 -dname "CN=10.3.0.1, OU=MyOrg, O=MyCompany, L=MyCity, S=MyState, C=US" -ext "SAN=IP:10.3.0.1"

Export Cert

keytool -exportcert -alias nifi-cert -file nifi-cert.crt -keystore keystore.p12 -storetype PKCS12

Zakk a1mzone