Samuel Walters-Nevet SamuelWN

Spawning multiple ffmpeg processes with xargs:

On standard NVIDIA GPUs (Not the Quadros and Tesla lines), NVENC encodes are limited to two simultaneous sessions. The sample below illustrates how to pass a list of AVI files to ffmpeg and encode them to HEVC on two encode sessions:

$ find Videos/ -type f -name \*.avi -print | sed 's/.avi$//' |\
  xargs -n 1 -I@ -P 2 ffmpeg -i "@.avi" -c:a aac -c:v hevc_nvenc "@.mp4"

This will find all files with the ending .avi in the directory Videos/ and transcode them into HEVC/H265+AAC files with the ending .mp4. The noteworthy part here is the -P 2 to xargs, which starts up to two processes in parallel.

Setup SSH Authentication for Git Bash on Windows

Prepararation

Create a folder at the root of your user home folder (Example: C:/Users/uname/) called .ssh.
Create the following files if they do not already exist (paths begin from the root of your user home folder):

.ssh/config

In this article, I will share some of my experience on installing NVIDIA driver and CUDA on Linux OS. Here I mainly use Ubuntu as example. Comments for CentOS/Fedora are also provided as much as I can.

For this method, alongside your Pi Zero, MicroUSB cable and MicroSD card, only an additional computer is required, which can be running Windows (with Bonjour, iTunes or Quicktime installed), Mac OS or Linux (with Avahi Daemon installed, for example Ubuntu has it built in).
1. Flash Raspbian Jessie full or Raspbian Jessie Lite onto the SD card.
2. Once Raspbian is flashed, open up the boot partition (in Windows Explorer, Finder etc) and add to the bottom of the config.txt file dtoverlay=dwc2 on a new line, then save the file.
3. If using a recent release of Jessie (Dec 2016 onwards), then create a new file simply called ssh in the SD card as well. By default SSH i

Bash string manipulation cheatsheet

Assignment
Assign `value` to `variable` if `variable` is not already set, `value` is returned. Combine with a `:` no-op to discard/ignore return `value`.	`${variable="value"}` `: ${variable="value"}`

Markdown cheatsheet

(Also see [remarkable][], the markdown parser created by the author of this cheatsheet)

	#!/usr/bin/env python
	# -- coding: utf-8 --
	#
	# Description: Create a Plex collection from a text file list of rating keys.
	# Author: /u/SwiftPanda16
	# Requires: plexapi

	from plexapi.server import PlexServer

	#!/usr/bin/env ruby

	require 'open3'
	require 'json'

	ffmpeg_bin = '/usr/local/bin/ffmpeg'
	target_il = -24.0
	target_lra = +11.0
	target_tp = -2.0
	samplerate = '48k'

Samuel Walters-Nevet SamuelWN

Setup SSH Authentication for Git Bash on Windows

Prepararation

Table of Contents

Setting up Pi Zero OTG - The quick way (No USB keyboard, mouse, HDMI monitor needed)

Bash string manipulation cheatsheet

Markdown cheatsheet

Table of contents