/dev/null Lamercho

How to mount a qcow2 disk image

This is a quick guide to mounting a qcow2 disk images on your host server. This is useful to reset passwords, edit files, or recover something without the virtual machine running.

Step 1 - Enable NBD on the Host

modprobe nbd max_part=8

Encoding high-quality HEVC content in a two-pass manner with FFmpeg - based NVENC encoder on supported hardware:

If you've built ffmpeg as instructed here on Linux and the ffmpeg binary is in your path, you can do fast HEVC encodes as shown below, using NVIDIA's NPP's libraries to vastly speed up the process.

Now, to do a simple NVENC encode in 1080p, (that will even work for Maxwell Gen 2 (GM200x) series), start with:

ffmpeg  -i <inputfile> -pass 1 \
-filter:v hwupload_cuda,scale_npp=w=1920:h=1080:format=nv12:interp_algo=lanczos,hwdownload,format=nv12 \

-c:v hevc_nvenc -profile main -preset slow -rc vbr_2pass \

Streaming your Linux desktop to Youtube and Twitch via Nvidia's NVENC and VAAPI:

Considerations to take when live streaming:

The following best practice observations apply when using a hardware-based encoder for live streaming to any platform:

Set the buffer size (-bufsize:v) equal to the target bitrate (-b:v). You want to ensure that you're encoding in CBR mode.
Set up the encoders as shown:

1. Setup ODBC on your Mac (including Apple Silicon)

Install brew

https://brew.sh

unixodbc package from brew works for Apple Silicon

See https://formulae.brew.sh/formula/unixodbc#default

check installation logs:

cat /var/log/install.log

find the issue:

...
2022-04-26 22:50:21+03 tsarenkotxt installd[1641]: PackageKit: Extracting file:///var/folders/8x/_h18ksqn64dgswlstgcd_fw40000gn/C/com.apple.appstoreagent/com.apple.appstore/0C4C5EA3-A445-4CF0-9E44-37938052A4D9/kwb3255311556092828694.pkg#Xcode.pkg (destination=/Library/InstallerSandboxes/.PKInstallSandboxManager/7A629BA6-7537-469C-8C19-C74DD52245A1.activeSandbox/Root, uid=0)
2022-04-26 23:03:05+03 tsarenkotxt installd[1641]: PackageKit: Removing client PKInstallDaemonClient pid=3827, uid=501 (/System/Library/PrivateFrameworks/AppStoreDaemon.framework/Support/appstoreagent)

Background

The instructions for setting up the Unifi Controller on ARM do not cover ARM64. The documentation states that ARM64 is not supported but hints it can be setup manually. The documentation also states that Java 8 is currently required. The following is therefore clearly in unsupported territory but so far seems to work fine. The internet has numerous references and resources but they weren't all easy to find and the ones I read required some modification for my configuration.

Note for the future: double check versions and source documentation if these instructions are dated. Also these instructions are specifically tailored for Ubuntu. See original references for other platforms.

Last update March 25, 2021

Base configuration

How to disable systemd-resolved in Ubuntu

Stages

Disable and stop the systemd-resolved service:

  sudo systemctl disable systemd-resolved.service
  sudo systemctl stop systemd-resolved

Then put the following line in the [main] section of your /etc/NetworkManager/NetworkManager.conf:

I am assuming you are here because like me, you installed a bazillion different python interpreters on mac and the whole thing is a spagetti. Today, I finally fixed my python installation. Whatever I install for python2 or python3 using pip JUST.WORKS.. My god! finally.

What the hell?

Here is what I had messed up, which you also probably did:

I had too many different python interpreters
Too many different symlinks which I lost track of
almost no package I installed with pip worked without a headache
any attempt to fix using online resources made it worse.

	; Reference - https://www.mpselectmini.com/starting_ending_g-code_scripts
	M400 ; wait for pending commands to finish
	M104 S0 ; turn off hotend/extruder heater
	M140 S0 ; turn off bed heater
	G91 ; set to relative positioning
	G1 E-2 F300 ; retract the filament a bit before lifting the nozzle to release some of the pressure
	G1 Z1 ; raise Z 1mm from current position
	G1 E-2 F300 ; retract filament even more
	G90 ; set to absolute positioning
	G1 X20 ; move X axis close to tower but hopefully far enough to keep the fan from rattling

	---
	blueprint:
	name: Renew Let's Encrypt Certificate
	description: Renew Certificate when due date is below given value
	domain: automation
	input:
	cert_expiry_sensor:
	name: Certificate Expiry Sensor
	description: Sensor from the Certificate Expiry Integration (https://www.home-assistant.io/integrations/cert_expiry)
	selector: