Andrei Subbota numbata

Introduction

This challenge tests if you can locate the cause of a Rails issue in 5 iterations (script execution). Although it's a Rails issue, prior knowledge on Rails is not required.

The 5 iterations limit may feel constraining, but it is intentional. If you can't locate the cause within the limitation, that's totally fine.

After the challenge, there's a simple questionnaire. If you can answer the questions, it'll help me prepare my talk for RubyKaigi. Any feedback will be appreciated 🙏

I recommend allocating 1.5 hr for the challenge and the questions

FFmpeg and libav's playbook: Advanced encoding options with hardware-based acceleration, NVIDIA's NVENC and Intel's VAAPI-based encoder.

Hello guys,

Continuing from this guide to building ffmpeg and libav with NVENC and VAAPI enabled, this snippet will cover advanced options that you can use with ffmpeg and libav on both NVENC and VAAPI hardware-based encoders.

For ffmpeg:

The most pragmatic way to write a mobile app

I want to talk about different approaches in writing mobile apps. I will tell you when it is a good idea to pretend that your responsive website is an app. Also about evolution of this idea from basecamp and DHH - turbolinks. I will tell you about my lovely ReactNative and the problems it has. When you can't avoid writing apps in native sdk and what difficulties you may face going this way.

Last year I used to write apps in objective-c. My open source works mostly around react native but my heart is with Ruby on Rails.

Encoding Video

Installing

Install FFmpeg with homebrew. You'll need to install it with a couple flags for webm and the AAC audio codec.

brew install ffmpeg --with-libvpx --with-libvorbis --with-fdk-aac --with-opus

	class User < ApplicationRecord
	has_many :posts

	# Violates Single Responsibility Principle (SRP)
	def make_admin
	self.update(:is_admin, true)
	end

	# Violates Law of Demeter (LoD) and N+1 query issue
	def recent_posts_with_comments

	$ tail -3 ~/.ssh/config
	Host pbcopy-host
	HostName 10.0.1.1
	User key

	$ cat ~/.vimrc \| grep pbcopy
	Plug 'ahw/vim-pbcopy'
	let g:vim_pbcopy_remote_cmd = "ssh pbcopy-host pbcopy"

	#!/bin/bash

	# "docker run" with SSH Agent Forwarding for boot2docker

	# QuickStart:
	# 1. Download to ~/bin/docker-run-ssh and chmod +x it
	# 2. docker-run-ssh [normal args to docker run...]

	# Use a unique ssh socket name per-invocation of this script
	SSH_SOCK=boot2docker.$$.ssh.socket

	SELECT schemaname, relname,
	seq_scan as table_scans,
	idx_scan as index_scans,
	pg_size_pretty(pg_relation_size(relid)) as table_size,
	n_tup_ins + n_tup_del + n_tup_upd + n_tup_hot_upd as write_activty
	FROM pg_stat_user_tables
	WHERE seq_scan > 1000
	AND seq_scan > ( idx_scan / 10 )
	AND pg_relation_size(relid) > ( 16000000 )
	ORDER BY pg_relation_size(relid) desc;

	#!/usr/bin/env bash

	# Loads and mounts an ISO over SMB via the
	# SuperMicro IPMI web interface
	#
	# usage: supermicro-mount-iso.sh <ipmi-host> <smb-host> <path>
	# e.g.: supermicro-mount-iso.sh 10.0.0.1 10.0.0.2 '\foo\bar\windows.iso'

	set -x

	WITH table_scans as (
	SELECT relid,
	tables.idx_scan + tables.seq_scan as all_scans,
	( tables.n_tup_ins + tables.n_tup_upd + tables.n_tup_del ) as writes,
	pg_relation_size(relid) as table_size
	FROM pg_stat_user_tables as tables
	),
	all_writes as (
	SELECT sum(writes) as total_writes
	FROM table_scans