Sina Meraji sinameraji

WebM to MP4 using FFmpeg

This FFmpeg command converts a .webm video file to a standard .mp4 file using the libx264 codec for video, aac codec for audio, and a CRF value of 22. The preset is set to 'slow' for higher quality encoding, and the audio bitrate is set to 128 kbps.

If the input and output filenames don't contain spaces, quotation marks or other special characters:

ffmpeg -i input.webm -c:v libx264 -preset slow -crf 22 -c:a aac -b:a 128k output.mp4

electron

author electron github electron electron docs awesome-electron electron-react-boilerplate

what is electron

How to remove node_modules

Create a `.gitignore` file

Check for an existing .gitignore file in the project directory

ls -a

How to use Hexo and deploy to GitHub Pages

1. Install Hexo

$ sudo npm install -g hexo-cli

$ hexo -v
hexo-cli: 0.1.9

Project Title

One Paragraph of project description goes here

Getting Started

These instructions will get you a copy of the project up and running on your local machine for development and testing purposes. See deployment for notes on how to deploy the project on a live system.

	const MY_DOMAIN = 'example.com';

	/*
	* Enter your Notion URL slug to page ID mapping
	*/
	const SLUG_TO_PAGE = {
	'': '771ef38657244c27b9389734a9cbff44',
	};

	const PAGE_TITLE = '';

	#-------------------------------------------------------------------
	# This is a compound interest calculator, along with some challenge
	# Written by Leon Wee, March 2018.
	# Anyone may freely copy or modify this program.
	#-------------------------------------------------------------------

	# C = P[(1+r)^n - 1]
	# Where:
	# C = the compound interest
	# P = the principal investment amount (the initial deposit or loan amount)

	# Online k-means algorithm
	# see http://www.cs.princeton.edu/courses/archive/fall08/cos436/Duda/C/sk_means.htm

	import numpy as np

	def k_means(data, k, threshhold=2):
	"""
	Does k-means clustering of the data.

	Args:

	#!/bin/sh
	set -ex

	for i in *.mp4; do
	ffmpeg -y -i "$i" -c:v libvpx-vp9 -pass 1 -b:v 2M -crf 30 -threads 8 -speed 4 \
	-pix_fmt yuv420p -tile-columns 6 -frame-parallel 1 \
	-an -f webm /dev/null


	ffmpeg -i "$i" -c:v libvpx-vp9 -pass 2 -b:v 2M -crf 30 -threads 8 -speed 2 \

	// https://maktabkhooneh.org/course/%D9%85%D8%A8%D8%A7%D9%86%DB%8C-%D8%A7%D9%82%D8%AA%D8%B5%D8%A7%D8%AF-mk170/
	[...document.querySelectorAll('a.chapter__unit')]
	.map(x => () => fetch(x.href)
	.then(x => x.text())
	.then(x => new DOMParser().parseFromString(x, 'text/html').querySelector('meta[property="og:video"]').content)
	.then(y => console.log(y, x.children[1].innerText.trim().replace(/\s/g, '_') + '.mp4'))
	)
	.reduce((promise, next) => promise.then(next), Promise.resolve())
	.then(() => console.log('Finished!'));