Andrii Ka andriika

Live streaming with HTML5

This document contains collected notes regarding html5 live streaming approaches. I'm trying to understand how to build a system that enables streaming of live video to HTML5 clients. Following content is mainly centered around MPEG-DASH - modern way of dealing with given needs.

Approach 1

To prepare movie.avi from MPEG-DASH streaming we will execute following ffmpeg commands:

> ffmpeg -y -i movie.avi -an -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 1500k -maxrate 1500k -bufsize 3000k -vf "scale=-1:720" movie-720.mp4
> ffmpeg -y -i movie.avi -an -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 800k -maxrate 800k -bufsize 1600k -vf "scale=-1:540" movie-540.mp4
&gt; ffmpeg -y -i movie.avi -an -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 400k -maxrate 400k -bufsize 800k -vf "scale=-1:360" movie-360.mp4

if file not exists

bash:

if [ ! -f .env ]; then
    echo "ERR: .env file not found. Please create one, details: https://devcenter.heroku.com/articles/heroku-local#set-up-your-local-environment-variables"
    exit 1
fi

win:

systemd Cheat Sheet

Add/Edit a Unit (.service)

# add new .service file
cp app.service /etc/systemd/system/

# or edit existing
systemctl edit --full app.service

Apache Calcite get started example. Enables SQL over in-memory json objects stored in java.util.Map.

<dependency>
    <groupId>org.apache.calcite</groupId>
    <artifactId>calcite-core</artifactId>
    <version>1.23.0</version>
</dependency>

I

One morning, as Gregor Samsa was waking up from anxious dreams, he discovered that in his bed he had been changed into a monstrous verminous bug. He lay on his armor-hard back and saw, as he lifted his head up a little, his brown, arched abdomen divided up into rigid bow-like sections. His blanket perched high on this belly could hardly stay in place; it seemed about to slide off completely. His numerous legs, pitifully thin in comparison to the rest of his circumference, flickered helplessly before his eyes.

“What’s happened to me?” he thought. It was no dream. His room, a proper room for a human being, only somewhat too small, lay quietly between the four well-known. walls. Above the table, on which an unpacked collection of sample cloth goods was spread out—Samsa was a traveling salesman—hung the picture which he had cut out of an illustrated magazine a little while ago and set in a pretty gilt frame. It was a picture of a woman with a fur hat and a fur boa. She sat erect, lifting up in the direction

	package acme;

	import java.io.IOException;
	import java.net.InetSocketAddress;
	import java.nio.ByteBuffer;
	import java.nio.channels.SelectionKey;
	import java.nio.channels.Selector;
	import java.nio.channels.ServerSocketChannel;
	import java.nio.channels.SocketChannel;
	import java.util.Iterator;

	import logging
	import os

	import fsspec
	import yaml
	from fsspec import AbstractFileSystem

	log = logging.getLogger(__name__)