Live Streaming Setup Guide –
OBS, ATEM, and Web Presenter

Streaming to Facebook from a BMD Web Presenter

This guide shows you how to setup OBS Studio for Live Streaming to Facebook Live. You will use a computer, Web Presenter, and an ATEM.

This is the first in a series of Church Technology How-To Guides. It has been prepared to assist people using a portable streaming kit I built for The Salvation Army. Rather than distributing these instructions as a PDF, I’m publishing the information here. There are many different ways to live stream, but this is how I recommend people approach simple live streaming situations.

What You Need

  • Reliable internet connection
    • You need at least 4Mbps Upload
  • Windows or Apple Mac OS Computer
    • macOS 10.10 or newer, or Windows 7 or newer
    • Minimum 4GB RAM
    • 1x Ethernet Port
    • 2x USB Ports
    • Lower-grade CPUs (such as Pentium, Atom, Core 2 and i3) are not recommended
    • Dedicated graphics card is preferred
  • HDMI or SDI Capture Interface: Blackmagic Design Web Presenter
  • Video Switcher: ATEM Television Studio HD
  • HDMI and/or SDI Cameras in 1080i50 mode
  • Video Cabling (HDMI or SDI)
  • Network Router with LAN and WAN ports
  • Publisher or Admin permissions to a Facebook Page
  • Audio Console with XLR Outputs
  • Microphones

Preparation – Software Installation

Before you begin, you need to download and install two free software applications:

  1. Blackmagic ATEM Switcher Software
  2. OBS Studio

These applications are both regularly updated, so make sure you update your software before the event.

Setup Instructions – Connections

Place your ATEM, Web Presenter, and Computer on a table in close proximity to each other, and make the following connections:

  • Web Presenter USB, to Computer USB
  • ATEM USB, to Computer USB
  • PGM Output on the ATEM (SDI/BNC), to the SDI Input on the Web Presenter
  • ATEM HDMI Multi-View Output, to HDMI Input on small monitor
  • ATEM Ethernet connection to a LAN port on your router
  • Ethernet port on your Computer to a LAN port on the router
  • LAN port on the wall, to Internet/WAN port on the router
  • ATEM, Web Presenter, Router, and Computer Power to Power Board
  • Audio Console XLR Output, to Analog Audio Input on ATEM
  • Camera HDMI and SDI output to ATEM HDMI and SDI Inputs
  • Microphones to Audio Console Inputs

ATEM Connection Diagram

Web Presenter Connection Diagram

Router Connection Diagram

Audio Console Connection Diagram

Setup Instructions – Connecting to the ATEM

In this step, we’ll connect the laptop to the ATEM switcher and check/change some connection settings.

  1. Make sure your computer is connected to the router via Ethernet
  2. Turn off any WiFi Connection
  3. Find your computer’s local IP address and take note
  4. Open the ATEM Setup software on your PC
  5. If your ATEM needs updating, you will be prompted to do so now
    1. DO NOT power off your Computer or ATEM while performing this step, or you can break the switcher
    2. Please make sure you have the latest version of the software, otherwise you will downgrade the ATEM switcher
  6. If the computer is successfully connected to the ATEM via USB, you will see the IP Address settings
    1. If the Router and ATEM have already been configured properly, the first three segments of the IP address will exactly match your computer’s IP address found in Step 3
    2. Take note of the ATEM’s IP Address
  7. Close ATEM Setup
  8. Open ATEM Software Control
  9. Enter the IP Address of the ATEM you found in Step 6b
  10. You will now be connected to your ATEM

Setup Instructions – Configuring the ATEM

In this step, we’ll check and change some format settings in your ATEM switcher.

  1. In ATEM Software Control, click the cog wheel in the bottom left of the screen
  2. In the General Tab, set the Resolution to “1080i50”
  3. In the Labels Tab, type in the names of each of your video inputs
  4. Save your settings
  5. In the File menu, press “Save Startup State”

You will need to make sure your cameras are set to 1080i50 mode, or you will receive no video input.

Setup Instructions – ATEM Audio

  1. In the ATEM Control software, go to the “Audio” tab
  2. Turn all Audio Inputs off
  3. Turn on the External Audio Input
  4. Set the External Audio input to 0dB (unity)
    1. This is roughly equivalent to putting the fader around 1/4 from the top of the range
  5. Speak into a microphone, turn up the channel on your Audio Console, and test the External Audio meters move in the ATEM software

Setup Instructions – Configuring OBS Settings

In this section, we’ll configure all the settings in OBS.

  1. Open OBS Studio
  2. Open the “Preferences” menu
  3. Save the following settings:
Tab Setting Name Setting Value
Output Mode Simple
Video Bitrate On slow connections, set ‘1024’.
On faster connections, set ‘4096’.
Encoder Software (x264)
Audio Bitrate 96
Recording Path (Pick a folder on your computer. You’ll need around 2GB per hour)
Record Quality Same as Stream
Record Format mkv
Audio Sample Rate 44.1Khz
Channels Stereo
Desktop Audio Device Disabled
Desktop Audio Device 2 Disabled
Mic/Auxiliary Audio Device Web Presenter
Video Base Canvas Resolution 1280×720
Base Canvas Resolution 1280×720
Output Scaled Resolution 1280×720
Downscale Filter Bicubic
Common FPS Values 30
Hotkeys Disable all hotkeys
Advanced Color Format NV12
YUV Color Space 601
YUV Color Range Partial
Automatically Reconnect Enabled
Network – Bind to IP Select the IP address of your Ethernet adapter on your PC (this is the one you found in the “Connecting to the ATEM” section)

Advanced Note: It’s possible to have your ATEM one one network, and your Streaming Internet Connection on another interface. To do this, you can set the “Network – Bind to IP” setting to your Internet-facing Ethernet/WiFi port. However, to access the internet in your web browser, you’re going to need to change the ‘Interface Metric’ in your computer’s network settings. This an advanced procedure. For simplicity, it’s recommended you keep everything on the same network.

Setup Instructions – OBS Video and Audio

In this section, we’re going to to get a video and audio input into OBS.

  1. In the bottom left of OBS, find the “Scenes” pane and press the “+” button underneath
    1. Give your scene a name
    2. Select your Scene
  2. Find the “Sources” pane, press the “+” button underneath, and select “Video Capture Device”
    1. Enter any name
    2. Set the Device to “Blackmagic Web Presenter”
    3. Set the Preset to “1280 x 720”
  3. Under the Sources pane, press the “+” button, and select “Audio Input Capture”
    1. Enter any name
    2. Set the Device to “Blackmagic Web Presenter”

By this point, you should have Audio and Video Inputs working. You will be able to see your full-screen video in the preview screen, and monitor your audio input levels down the bottom.

Setup Instructions – Facebook Live

In this section, we’ll create a live video stream on Facebook and configure OBS to use it.

  1. In a Web Browser, go to Facebook and Login
  2. Navigate to the Page where you wish to stream your video
    1. In the top menu, click “Publishing Tools”
    2. On the left menu, press “Video Library”
    3. On the right, press the “+ Live” button
    4. Fill out a Title, Tags, and Description.
    5. Copy the “Stream Key” text
  3. In OBS, open the “Preferences Menu”
    1. Go to the “Streaming” section
    2. Select the service “Facebook”, leave the default server, and paste in the Stream Key
    3. Save your preferences
  4. In OBS, press “Start Streaming”
  5. In Facebook, wait for the video to buffer and ensure the video and audio are both working
    1. When you are ready to start the event, press “Go Live”

Monitoring your Live Stream

While you are live streaming, you will want to keep an eye on some things:

  • Audio Levels
    • Keep your audio as loud as possible, without clipping
    • Don’t be afraid to use the built-in compression on the desk
    • Use your ears to verify you’re not clipping (on the stream) and not over-compressing
  • Dropped Frames
    • Dropped Frames (bottom toolbar in OBS) will show you if your CPU and/or Internet Connection aren’t keeping up
    • If you drop too many frames, the stream will disconnect
    • It is a good idea to test the connection ahead of time, paying particular attention to the dropped frames
  • Bitrate
    • Your bitrate should always remain in the ballpark of your specified bitrate (1024Kbps or 4096Kbps)
    • If your bitrate drops, you may have issues with your CPU and/or network
  • CPU
    • Ideally, your CPU should remain under 50%
    • If your CPU runs consistently high, you may experience over-heating or dropped frames

If you run into performance issues during your event, first try lowering the bitrate.

 

 

How to Find Your Computer’s IP Address

Windows 7

  1. Click the Start Menu, and select Run.
  2. Type “cmd” into the box and press “OK”
  3. At the prompt, type “ipconfig” and press “Enter”
  4. Information about your IP Address will be displayed

Windows 10

  1. Click the search box next to the Start Menu
  2. Type “cmd” into the box and press “Enter”
  3. At the prompt, type “ipconfig” and press “Enter”
  4. Information about your IP Address will be displayed

Mac

  1. Open the “Terminal” application (via Spotlight or Applications folder)
  2. At the prompt, type “ifconfig” and press “Enter”
  3. Information about your IP Address will be displayed

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I'm Anthony Eden, and I'm a broadcast technician / software developer / technology solutions engineer. I've been working in broadcast media since 2008 (getting my start in Community Radio while still at school), and developing software and websites for just as long. Right now, I work full time for Hope Media, and provide some freelance services through Media Realm.

Follow Anthony on Twitter: @anthony_eden or Google+