albert-zhang

Convert to specific resolution:

ffmpeg -i input.mov -vcodec h264 -acodec aac -s 1280x720 output.mp4

ffmpeg -i {input}.mov -vcodec h264 -acodec aac -strict -2 output.mp4

Stream camera to rtmp on Mac:

ffmpeg -f avfoundation -framerate 30 -i "0" -c:v libx264 -an -f flv rtmp://localhost:1935/live/mystream

Stream file to rtmp:

ffmpeg -re -i ~/Desktop/input.mp4 -c copy -f flv rtmp://localhost:1935/live/mystream

albert-zhang

// http://mp.weixin.qq.com/s?__biz=MzAxODE2MjM1MA==&mid=2651551510&idx=1&sn=ad6f87385c39c90c2501ca94b5f5c8dc
var designWidth = 640, rem2px = 100;
var d = window.document.createElement('div');
d.style.width = '1rem';
d.style.display = "none";
var head = window.document.getElementsByTagName('head')[0];
head.appendChild(d);
var defaultFontSize = parseFloat(window.getComputedStyle(d, null).getPropertyValue('width'));
d.remove();
document.documentElement.style.fontSize = window.innerWidth / designWidth * rem2px / defaultFontSize * 100 + '%';

albert-zhang

POST JSON

curl -H "Content-Type: application/json" -X POST -d '{"key":"value"}' http://example.com

http://stackoverflow.com/questions/7172784/how-to-post-json-data-with-curl-from-terminal-commandline-to-test-spring-rest

POST File

curl -X POST -d @/path/to/myfile http://example.com

http://stackoverflow.com/questions/3007253/send-post-xml-file-using-curl-command-line

POST Multipart

curl \

albert-zhang

// Get provider outside of angular:
angular.element(document.querySelector('.app')).injector().get('SomeService')

albert-zhang

Ref:

http://colinzhouyj.blog.51cto.com/2265679/1566438

http://apetec.com/support/generatesan-csr.htm

https://stackoverflow.com/questions/21488845/how-can-i-generate-a-self-signed-certificate-with-subjectaltname-using-openssl

Create key for CA

albert-zhang

const semver = require('semver')
const exec = require('child_process').exec
const packageJson = require('./package.json')

const prjName = packageJson.name

function getRemoteVer() {
    return new Promise((resolve, reject) => {
        const theCmd = 'npm show ' + prjName + ' version --registry=http://example.com'
        exec(theCmd, function(err, stdout, stderr) {

albert-zhang

# ref: https://stackoverflow.com/questions/31972968/cant-install-gems-on-os-x-el-capitan

sudo gem install THE_GEM -n/usr/local/bin

albert-zhang

start on filesystem and started networking
respawn
chdir /home/work/node-app
env NODE_ENV=production
exec /usr/bin/node /home/work/node-app/index.js

albert-zhang

sudo apt-get install xvfb
sudo apt-get install libnss3 libgtk-3-0 libxss1 libasound2
sudo apt-get install zenity

xvfb-run npm run start

export XAUTHORITY=/tmp/xvfb-run.XXXXXX/Xauthority

x11vnc -display :99 -nopw

albert-zhang

create file the-name.service at /etc/systemd/system:

[Unit]
Description=the-desc
After=network.target
StartLimitIntervalSec=0

[Service]
Type=simple