Live streaming

Bandwidth for streaming: How much do you need?

July 31st, 2019 Jordan Sheldrick

Bandwidth for streaming: How much do you need? image

What is bandwidth for streaming? What’s the difference between bandwidth and speed? How much bandwidth do you need for 1080p streaming? We’ve got answers.

What is bandwidth?

Bandwidth is the capacity of a network to upload and download data. Internet bandwidth is the maximum volume of information you can send and receive in a measured amount of time. It’s generally calculated in megabits per second (Mbps).

When streaming video to the Internet, you are consuming upload bandwidth. It’s essential to know your network’s available upload bandwidth because it enables (and also limits) the quality of your outgoing streams.

Available bandwidth depends on the network router, environment, and most importantly, the connection type. For example, dial-up Internet had a maximum bandwidth of just 56 kilobits per second (kbps). In contrast, more modern connection types like fiber-optic landline (622 Mbps), Gigabit Ethernet (1,000 Mbps), and 4G LTE (100 Mbps) have much higher bandwidths.

Bandwidth vs. speed

Various online speed tests offer to test how fast your network is. But is that the same as bandwidth? Not quite. “Bandwidth” and “speed” are often used interchangeably, yet there is a difference between these two terms.

If bandwidth is the maximum rate for data transfer, speed is how fast data is factually downloaded or uploaded. Like bandwidth, the connection speed is also measured in Mbps.

Since live streaming involves uploading data to the Internet, having ample upload speed is important. In fact, for successful live streaming, you’ll need both sufficient upload bandwidth and upload speed.

As with download speed, upload speed has a set rate (e.g., “5 Mbps upload speed”) as dictated by your Internet service provider (ISP). Because bandwidth sets the upper limit for the data transfer rate, there’s no sense in purchasing Internet speeds from your ISP that exceed your maximum bandwidth.

Bandwidth vs. bitrate

Because raw video and audio are too hefty to upload, streamed content needs to be encoded. Encoding compresses video and audio content into a size and format that’s easy to send to the Internet.

Bitrate is the amount of data encoded per unit of time. When it comes to streaming, it’s usually measured in kKbps, and less frequently in Mbps. Generally speaking, the higher the bitrate, the higher the video quality, and the higher the upload bandwidth required.

To encode your content, you’ll use either a software encoder or a hardware encoder (like Pearl Nano, Pearl Mini, or Pearl-2). You will set the bitrate in your encoder settings.

The total bitrate consists of the video and audio bitrates. The bitrate setting will depend on the video resolution and frame rate. For higher resolutions and frame rates, you’ll need higher bitrate settings. For example, the recommended encoding settings for 4K streaming at 60 frames per second (fps) will be higher than that for 1080p streaming at 30 fps. Insufficient bitrate will cause your stream to appear choppy.

How much bandwidth do I need for live streaming?

The amount of bandwidth you’ll need depends on your encoding bitrate. For example, if you are encoding at 3,000 kbps, you will need at least 3 Mbps of upload bandwidth. If your stream’s bitrate is too high relative to your upload bandwidth, your live stream will be unreliable for viewers. For example, a stream with a 6,000 kbps bitrate doesn’t work on a network with a 5 Mbps upload bandwidth limit.

Above are the general required bandwidth for streaming guidelines. For example, the minimum bandwidth required for 1080p (HD) streaming is 5 Mbps, while the minimum 4K (UHD) streaming bandwidth is around 25 Mbps.

Different platforms (e.g., YouTube, Twitch, Facebook) have different speed requirements and recommended encoding settings. So be sure to double-check before streaming.

How to ensure you have enough bandwidth for streaming

It’s simple math to realize that if you have 5 Mbps of upload bandwidth, your stream bitrate should be less than 5 Mbps. But just how much less? Bandwidth limitations are only part of the story! You’ll need to consider some additional factors to ensure the success of your live stream.

Always have some extra bandwidth (and upload speed) available

Ensure you always have enough bandwidth for streaming your broadcast – plus more. This additional headroom acts as a buffer to account for any changes to your network. Any user activity on your network (e.g., Internet uploads, VoIP communication, gaming) can affect both bandwidth and upload speed.

Use the simple formula below to estimate the required bandwidth for streaming:

Upload bandwidth for streaming formula

We recommend always having about 1.5x your stream’s bitrate available to account for these possible network fluctuations. For example, if your live stream has a bitrate of 5,000 kbps (5 Mbps), ensure you have at least 7.5 Mbps total upload bandwidth available to provide a reliable live stream. You may not need all of the calculated overhead bandwidth on a stable network, but it’s always best to be on the safe side.

Consider your network and connection type

As we mentioned, there are many different types of Internet connectivity, including fiber-optic, cable, satellite, and cellular data. Before live streaming, consider the varying levels of available bandwidth and network reliability each option offers.

For example, wireless cellular Internet tends to have lower maximum upload bandwidth and reliability, resulting in a lower-quality stream. Or maybe you live in a rural area and have a satellite connection. In that case, you might want to take weather into account before publishing your stream.

Fiber and cable connections generally offer higher speeds, which are best suited for live streaming. For improved reliability, it’s always best to use a hardwired Internet connection over Wi-Fi or cellular.

Network type

Consider ISP upload speeds and data caps

Many ISPs advertise upload and download bandwidth in terms of maximum and minimum speed.

For example, an Internet package might be advertised as “Up to 10 Mbps up and 30 Mbps down”. This particular “up to” phrasing is used because Internet speeds can vary. If using a cable network, for example, you’re sharing the Internet with other cable users within a geographical area, so your bandwidth may slow during “peak” periods of Internet activity during the day.

Some ISPs also have bandwidth usage maximums – so be aware your live stream doesn’t go beyond your monthly upload cap, or you may be charged additional fees.

ISP upload speeds and data capsRunning an Internet speed test is also important. You may have enough available bandwidth on your network but not enough upload speed, depending on how many devices are sharing the network and the types of activities on those devices.

Ensure you have additional bandwidth if streaming multiple programs

Multi-streaming is an increasingly popular live streaming strategy that involves publishing your broadcast to more than one content distribution network (CDN) platform simultaneously. Multi-encoding, on the other hand, is a similar technique that involves streaming the same program to the same CDN at different bitrates. Multi-streaming allows live streams to reach a greater audience, while multi-encoding helps to ensure accessibility of your live stream to viewers of all levels of download bandwidth.

Keep in mind that each additional program you publish adds to your total outgoing bitrate and requires additional upload bandwidth availability.

Additional bandwidth for streaming multiple programs

The final word

As you can see, the required bandwidth for streaming for a reliable live broadcast depends on a variety of factors. While there is no “one size fits all” configuration, rest assured that with the right tweaking you can publish a successful and reliable live stream regardless of your network.

And remember—as a general rule of thumb, we recommend your streaming upload bandwidth be at least 1.5x the combined bit rate of all your streamed programs (when streaming in SD or above). Happy streaming!

What are some of the most common issues you’ve experienced with bandwidth for streaming? Let us know in the comments!

11 Comments

  1. Marcel Stojka

    I had some problems with ping while streaming games recently. So I had to call my internet provider to fix it. Ive used this this online tool and it gave me best results (http://www.netmeter.co.uk). I hope it helps you too.

  2. Matthew J Brown

    I have recently started using the Logitech C920 for live streaming to facebook and youtube. Both platforms only show SD viewing and playback of the livestream. There’s much discussion about who’s fault this is but it some feel that the lower uploading bandwidth is the culprit. I only have 1mb upstream. My question is: can I put a 10 minute delay on the livestream? In other words – allow the “livestream” to load in HD for a period of time before it goes ‘live’ so there’s not a reduction in viewing quality?? Hope that makes sense.

    • Jordan Sheldrick

      Unfortunately a delay will not resolve the issue. The same amount of information is still needed to upload the content. Your bitrate will directly affect your stream quality and required bandwidth. Typically if you are looking to stream HD quality (minimum 720) you would need at least 3MB/s of dedicated upload speed to provide you with the appropriate amount of headroom to support the minimum required 2000 kbps upload bitrate. The bitrate will need to be adjusted at the device or software level, depending on your streaming method.

  3. Fredrik Sjodin

    Hey Jordan,

    Thanks for an awesome explanation on how streaming works.
    I had no idea really so it was a goldmine for me to find your article.

    >> #Question:

    Let’s say that I have a connection of 100/100.
    Meaning 100mb/s download and 100mb/s upload (in case someone wondering).

    Is it possible to stream at a “too high of quality” for my viewers to be able to watch properly?
    Or will their device and/or connection automatically adjust to the quality & speed it can handle?

    Meaning: Can I broadcast/stream with Full HD quality and viewers with high enough bandwitdh can watch it in Full HD quality – meanwhile viewers with lower bandwitdh can still watch it, only with a lesser quality.

    Is that correct?

    Thx in advance man.
    Looking forward to your reply.

    • Jordan Sheldrick

      Heya Fredrik,

      Adaptive bitrate (ABR) streaming is configured on the content delivery network (CDN) side of things. Think YouTube, for example.

      The CDN detects the bandwidth availability of each connected viewer and automatically transcodes the broadcast into a new stream with bitrate that is appropriate for each user’s respective network. In this way, ABR automatically “course corrects” your broadcast to ensure the viewer is able to continuously view your content without hitting a buffering wall.

      So even if you’re putting out a high-quality stream, viewers of all bandwidth levels shouldn’t have any difficulties.

  4. Brain vision production

    Great article

  5. Homer

    Hello Jordan

    Thank you for the simple way you explain the requirements. I having doing live streams on Facebook with a Samsung tablet A. I started out using mobile data got spot from a cell phone. I am not aware of the uploaded speed that they offer but there was not much is sure there apart from the using up of the monthly location.
    We have since installed a fibre network which provides 20down 5up. I am not sure if the 5up is stable however I have started to try adding youtube to the live stream to capture more audience.
    To do this I have tested out retreat io and Larix Broadcaster however I have noted that I have been having buffering isuures.
    I am told that FB requires 4mbs and youtube 6mbs and it is best to only stream to one. And I see that with 5mbs offered by the network the bandwith will not give the head room.
    My interest is setting the bitrates to match the network. In larix the audio bitrate is set at 128kps and video at 2500kps keyframe 2 with a 1088×1088 resolution.
    With these settings what adjustment would you recommend?

  6. Aaditya Goenka

    Hi, i want to stream my games to 720p on youtube or facebook or sometimes both
    so can anyone help me to choose my internet connection plans for flawless streaming
    Thanks in Advance

  7. Kachi

    Jordan, please I am also interested in the answer to Homer’s question above.

  8. Rod Auric

    Good article explaining concepts and rules of thumb. For one, I am stuck with whatever bandwidth my ISP provides me at this time. Short of buying a different product with more bandwidth, the easiest change I can make is in my encoding software. Given a particular upload bandwidth, how do I configure the parameters in the encoding software to get the best possible experience for my viewers?

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