Yury Korolev yury

以下は、AVCDecoderConfigurationRecord のバイトデータです。

ADDR    0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F
------ -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
000000 00 00 00 2e 61 76 63 43 01 42 c0 1e ff e1 00 16
000010 67 42 c0 1e d9 02 04 68 40 00 00 03 01 40 00 00
000020 03 00 83 c5 8b 92 01 00 05 68 cb 83 cb 20

AsyncDisplayKit Layout Transition API

Animating between layouts

The layout transition API makes it easy to animate between a node's generated layouts in response to some internal state change in a node.

Imagine you wanted to implement this sign up form and animate in the new field when tapping the next button:

`docker-machine` import/export

Script to import and export docker-machine configurations to sync between hosts/collaborators

Export (on host A)

$ docker-machine ls
NAME       ACTIVE   DRIVER         STATE     URL                            SWARM   DOCKER    ERRORS
dev        -        digitalocean   Running   tcp://example.com:2376                 v1.10.1

Sample config for 2 million web socket connection

    sysctl -w fs.file-max=12000500
    sysctl -w fs.nr_open=20000500
    # Set the maximum number of open file descriptors
    ulimit -n 20000000

    # Set the memory size for TCP with minimum, default and maximum thresholds 
 sysctl -w net.ipv4.tcp_mem='10000000 10000000 10000000'

Setting up ssh public key authentication on macOS using a YubiKey 4

I largely followed Florin's blog post, but have a few notes to add regarding issues I encountered:

Basic setup notes

I used a YubiKey 4, while the blog describes using a YubiKey NEO. I'm sure a YubiKey 5 would also work. I'm also running macOS 10.13.6.
I installed GPGTools as recommended. However, as I'll note later, it seems that gpg-agent only automatically starts when gpg is used; for ssh, you'll need to ensure it's running.
Before generating your keys, decide what key size you want to use. If you run the list command inside gpg --edit-card, look for the Key attributes line to see what is currently selected. On my YubiKey 4, it defaulted to 2048 bits for all keys:

Key attributes ...: rsa2048 rsa2048 rsa2048

	#!/usr/bin/env bash
	sudo yum groups install -y Development\ tools
	sudo yum install -y cmake
	sudo yum install -y python34-{devel,pip}
	sudo pip-3.4 install neovim --upgrade
	(
	cd "$(mktemp -d)"
	git clone https://github.com/neovim/neovim.git
	cd neovim
	make CMAKE_BUILD_TYPE=Release

	CREATE OR REPLACE FUNCTION notify_trigger() RETURNS trigger AS $$
	DECLARE
	channel_name varchar DEFAULT (TG_TABLE_NAME \|\| '_changes');
	BEGIN
	IF TG_OP = 'INSERT' THEN
	PERFORM pg_notify(channel_name, '{"id": "' \|\| NEW.id \|\| '"}');
	RETURN NEW;
	END IF;
	IF TG_OP = 'DELETE' THEN
	PERFORM pg_notify(channel_name, '{"id": "' \|\| OLD.id \|\| '"}');

	fragment float4 capturedImageFragmentShader(ImageColorInOut in [[stage_in]],
	texture2d<float, access::sample> capturedImageTextureY [[ texture(kTextureIndexY) ]],
	texture2d<float, access::sample> capturedImageTextureCbCr [[ texture(kTextureIndexCbCr) ]]) {

	constexpr sampler colorSampler(mip_filter::linear,
	mag_filter::linear,
	min_filter::linear);

	const float4x4 ycbcrToRGBTransform = float4x4(
	float4(+1.0000f, +1.0000f, +1.0000f, +0.0000f),

	# in /etc/systemd/system
	[Unit]
	Description=Bluetooth Agent
	[Service]
	ExecStart=/usr/bin/bt-agent -c NoInputNoOutput
	Type=simple
	[Install]
	WantedBy=multi-user.target

	cp -R /Applications/Xcode8.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/10.0\ \(14A345\) \
	/Applications/Xcode7.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport