Oficina de Streaming

PreOcupada 2019

 Oficinas do Convento. Montemor-o-Novo

12 Julho

Julián Pérez

info@julian-perez.com

BIO

Visual artist interested in how we relate to new media and the Internet.

I actively participate in projects that promote Free/Libre Culture in a collaborative way and work with projects and communities around data as artistic material, creative programming, digital narratives and live technologies.

Creative Coding Madrid

AvFloss

CoderDojo

Dio3Stu

Program (2h)

• Introduction to streaming
• OBS (PC)
  • Reception video signals from mobile devices over a local network
  • Setup for Audiovisual realization
  • Control with keyboard hotkeys or MIDI
• IPWebcam (Mobile)
• Intercom with Mumble/Pumble
• Live production tips

Intro

Basic Concepts

•  Bandwidth: maximum rate of data transfer across a given path
• Bit rate: the number of bits that are conveyed or processed per unit of time
• Codec/Encoding/Decoding: a codec encodes a data stream or a signal for transmission or storage, possibly in encrypted form, and the decoder function reverses the encoding for playback or editing
• Container/video format
• Protocol
• Server
• Client

Intro

Basic Concepts

Video formats, codecs and containers

Intro

Diagram

Intro

Capture

Intro

Encoding

with hardware

with software

h264

Intro

Compression, data loss

Intro

Containers, archive format

• AVI (.avi)
• MPG (.mp4, .ts, ...)
• MOV (.mov)
• ASF (asf .wma .wmv)
• Ogg (.ogg, .ogv)
• Matroska (.mkv)
• Webm (.webm)

Container: video, audio, subs, metadata

Wikipedia: container

Intro

Protocols

• HTTP, HTTPS
• HLS (Http Live Stream) (Apple)
• RTMP, RTMPS (Adobe)
• RTP, RTSP
• UDP, TCP
• webRTC, webTorrent

Intro

Servers

Own infrastructure

Intro

Better cases for streaming

• International event: Chaos Computer Club
• Virtual community behind: Live Coding
• Educational: Coding Challenge Daniel Shiffman
• Business: Bombay Streaming Bar
• Gaming: Twitch platform
• Demonstrations

• Accessibility
• Save travel costs
• Interaction with the public by chat
• The streaming is recorded 

OBS

Open Broadcaster Software

• free and open-source 
• cross-platform (windows, mac os, linux)
• streaming and recording program
• also mixing with some tweaks :)
• big gaming community behind
•  RTMP protocol: Youtube, Twitch, Facebook, Instagram
• x.264 Codec
• Filters, chromakey, text editor, monitoring, etc.
• Sources and Scenes

OBS

Interface

Preview

Program

OBS

• Hotkeys Keyboard

• MiditoOBS

IP Webcam

Android app

• free
• Motion JPG
• Separated streams for video and audio
• web server in mobile side
• web interface to control flash light, zoom, focus, etc.
• Customizable interface

IP Webcam