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System requirements for video bridge broadcasts

This article details the system requirements for broadcasting a Live event or recording a Simulated Live event with the video bridge. The Video Bridge supports up to 20 presenters connecting via Webcam or another source (for Advanced Video Bridge events only).

To join the Live Studio and moderate or present, your system must meet the following minimum system and hardware requirements. At least 48 hours before the event, run the system test with the hardware and network you will use on the day of the event. For system test instructions, see Video Bridge Guide for Presenters and Guest Admins.

If you're unable to open the Live Studio, access might be blocked by a firewall or your company network security rules. Review our network requirements and make sure the ports and IP ranges in the Webcast Presenters - Video Events column are permitted. If you're unsure of your settings, contact your IT Administrator.

Live Studio Requirements

If you're joining the Live Studio as a moderator or presenter, your system must meet the following requirements.

What you need Moderators and Presenters
Hardware PC or Mac

Note: Your computer must be plugged in and have a sound card with speakers and a monitor with 1024x768+ resolution support.

Operating System
  • Windows 11
  • Windows 10
  • Windows 8.1 Pro or newer
  • macOS 10.14 or newer
Processor (CPU) Intel Core i5 3.0GHz or better

Note: Less powerful processors will degrade audio and video performance.

Memory (RAM) 4 GB
Browser Current or previous 5 versions of:
  • Google Chrome
  • Firefox
  • Microsoft Edge

Note: Firefox does not support screen sharing.

Internet Speed A dedicated and wired high-speed internet connection of 3 Mbps or better (upload and download)

Note: To ensure a stable connection, disconnect from the VPN and use a wired internet connection, instead of Wi-Fi. Wi-Fi connections are prone to dips in bandwidth that can negatively impact your video connection.

Broadcasting Requirements

Video Bridge

For the best audio and video quality, we recommend that presenters use a:

  • High quality webcam (for example, Logitech C920) or HD webcast camera
  • Headset or webcam mic with built-in noise cancellation. Do not use your computer or webcam's built-in microphone.

When you join the Live Studio, you must grant it access to your mic and camera to connect your audio and video.

Advanced Video Bridge

If you're broadcasting with an advanced video bridge, you can connect to the event by phone or with webcam. You can also dial in to the event from Skype/Lync, an encoder, and a VCU or have the Live Studio dial out to your conference room or device. A moderator must join the Live Studio to connect the room or device to the event, start the event, manage event content and Q&A, and end the event. Presenters that will be presenting content must also join the Live Studio.

Note: To prevent the media playback from freezing and requiring a stream refresh, corporate users behind proxy servers should make sure their network settings don't time out on RTMPT requests. If you're unsure of your settings, contact your IT Administrator.

Encoder Requirements

To broadcast with an encoder, your must:

  • Have a dedicated connection with bandwidth that consistently exceeds the bit rate you are transmitting. For example, if you are streaming at 600 Kbps we recommend a dedicated connection of at least 1.2 Mbps. If you're using an active backup encoder, the bandwidth requirements should be doubled.
  • Have a hardware and software package capable of encoding live video streams delivered using the Real Time Messaging Protocol (RTMP). Your PC must permit either the RTMP (TCP over port 1935) or RTMPT (over port 80) live streaming protocol or both.
  • Support H.264 (Video) / AAC (Audio) configurations


  • If you are using an active backup encoder during a live webcast the bandwidth requirements discussed above should be doubled.
  • Be conscious of your target audience's bandwidth capabilities when broadcasting at higher bit rates.

VCU/Telepresence Requirements

To broadcast with a VCU, your VCU must allow incoming SIP or H.323 calls and support H.264 video.

Contact your Video Conferencing vendor or local IT Administrator to ensure firewall permissions allow incoming video calls.

Telephone Requirements

For the best audio and video quality, we recommend that presenters use a:

  • Touchtone phone if dialing in to the event
  • Headset or mic with built-in noise cancellation