Video Bitrate: What It Is And The Best Bitrates for Streaming Video
Table of Contents
An important thing to keep in mind is making sure you are always serving up the highest-quality videos to your audience, regardless of their device or internet connection. One way to ensure that you are always delivering great-looking videos to your viewers is to choose the optimal video bitrate for your needs.
In this piece, we will further discuss what video bitrate is, how it compares to video resolution, and how to choose the best video bitrate for streaming your content.
Table of Contents
- What is Video Bitrate?
- How is Video Bitrate Measured?
- What is Video Resolution?
- A Guide to Video Bitrates
- What is the Best Video Bitrate for Streaming?
With so many different terms in the online video world, it’s easy for them to become confused, especially if you’re not an experienced video streamer in the first place.
What is Video Bitrate?
Video bitrate is, quite simply, the amount of video data transferred over the internet at any given time.
A high bitrate is one of the key factors that contribute to your video’s overall quality. If your video has a high bitrate, as well as high resolution and a high frame rate, it will provide your viewers with a high-quality video that streams seamlessly.
Because video data is much larger than the data required to transmit photos or text, ensuring that your videos’ bitrate is high enough to quickly and reliably move your data over the internet is key to making sure your viewers have a smooth, reliable stream when they’re watching your videos.
In short, the bitrate is the speed at which your video content uploads to the internet from your camera or your server, as well as the speed at which your viewers are able to download your video content from the internet onto their devices.
How is Video Bitrate Measured?
Bitrate is measured in bits per second or bps.
While using a measurement such as kilobits per second (kbps) works for audio and other smaller files, it isn’t enough to capture just how much data is moved quickly with video files.
Megabits per second, or Mbps, are used when discussing the bitrate of a video file. This number shows the millions of bits of data uploaded to and downloaded from the internet each second.
What is Video Resolution?
Video resolution is another marker of the overall quality of a video file, but it doesn’t have anything to do with how quickly video data is transferred over the internet.
Instead, video resolution refers to the number of pixels forming the video frame, creating the video’s image on the screen. The more pixels a video contains, the higher that video’s quality.
Because it takes more data to move more pixels, a video with a higher resolution often requires a higher bitrate in order to get to the viewer quickly and reliably. In most cases, if it’s a matter of choosing video quality over the quick transmission of files, it’s better to choose a lower video resolution and have the video file transmit without pausing than to use a high video resolution but force the viewer to sit and wait for all that data to travel to their device.
A Guide to Video Bitrates
Choosing the right video bitrate for your content is dependent greatly upon how that video will be consumed and whether you are trying to transmit high-resolution video.
The lower the resolution needs for your video, and the lower the resolution of the screen a user will be viewing, the lower the bitrate your video needs. But, as the resolution of the video increases, the more your video’s bitrate needs to increase.
Additionally, your bitrates need to take into consideration variable internet speeds.
For viewers that have better, more reliable internet connections, a higher bitrate is ideal. But those viewers with lower-quality, less reliable internet connections need a lower bitrate to avoid constant buffering and lagging video feeds.
Bitrates and Video Encoding
Selecting a video file’s bitrate happens during the encoding process.
You select the bitrate you want your video to be transferred at, and your video encoder ensures that the file is compressed into one smooth, steady video to help meet that bitrate.
Your videos also need to be transcoded, or compressed into a smaller file size, to help with their uninterrupted delivery to the viewer.
Because you are likely to have different viewers with different bitrate needs, making sure that your videos are available in all these different bitrates is important to serving up the right version to each viewer at the right time. But doesn’t this mean that you need to transcode multiple versions of your video, each at a different bitrate?
No, it doesn’t — that’s where multi-bitrate streaming comes in.
Multi-bitrate streaming involves making multiple copies of a video, each with a different bitrate. These videos are then waiting to be used, chosen specifically by the user.
This type of streaming also supports adaptive bitrate streaming. This process analyzes the internet signal in use by an individual user and then serves them the bitrate best suited to their signal. So, one user with a great signal will be sent a video file at a high bitrate, while another user will be sent the same video in a lower bitrate because they have a weak signal.
Bitrates and Frame Rate
Your video’s frame rate is measured in frames per second or FPS. This metric measures how quickly consecutive images appear in a video feed.
Think of frame rate kind of like a flipbook: The faster you turn a page holding an individual image, the more consistent and smooth the overall image appears. As you slowed down, you began to see more of the individual images instead of one fluid, moving image.
If you have a lower frame rate, you are more likely to experience jerky, slow video viewing than if your video’s frame rate is higher.
However, there is no one “optimal” frame rate. Instead, the frame rate of your video is determined largely by what you’re depicting.
If you’re shooting just a regular video with low action, you can get away with a lower frame rate. For things such as sporting events, however, you need a higher frame rate to keep up with the quick-moving action and to keep the details crisp for viewers.
Frame Rate vs. Resolution and Bitrate
So, how do frame rate, resolution, and bitrate work together?
The frame rate and resolution of a video are somewhat related. If you have a higher frame rate, chances are you’re going to have a higher video resolution, too, so that the video’s details are more clear.
And, both the frame rate and resolution are related to a video’s bitrate, as the higher the resolution and frame rate, the higher the bitrate will have to be for a file to travel quickly over the internet.
With so much video being consumed on mobile devices, and with mobile data plans becoming more and more limited for users, the bitrate of video streamed on mobile devices is crucial.
Additionally, because the internet connections used by viewers when live streaming from mobile devices can be unpredictable, it’s important that you are able to provide video files at a bitrate that will stream well on your users’ mobile devices without unnecessarily eating up their data.
Providing a wide range of bitrates in your videos, thanks to multi-bitrate streaming, allows you to reach the largest number of devices and offer the best quality of video. For those with older devices, a lower bitrate is necessary since they cannot stream high-definition content; newer devices, on the other hand, are capable of streaming exceptionally high-quality content and require higher bitrates.
What is the Best Video Bitrate for Streaming?
Finding the right bitrate for your content can be a challenge.
Here are some recommended bitrates, depending on the resolution of the video you’re planning to stream:
|Name||Description||Max Video Bitrate||Max Audio Bitrate|
|4K – 2160p||UHD (Ultra High Definition)||20 Mbps||128|
|2K – 1440p||QHD (Quad High Definition)||15 Mbps||128|
|FHD – 1080p||FHD (Full HD)||7 Mbps||128|
|HD – 720p||SHD (Standard HD)||5 Mbps||128|
|SD – 480p||FWGVA (Full Wide Video Graphics Array)||2 Mbps||128|
|LD – 360p||nHD (Ninth of High Definition)||1.5 Mbps||128|
|ULD – 240p||WQVGA (Wide Quarter Video Graphics Array)||0.5 Mbps||128|
Optimal Bitrates for 20 Popular Streaming Platforms
Knowing the best bitrate for streaming on the video streaming platform you use is one of the key factors for selecting the best bitrate for streaming your content.
Here are the optimal bitrates for 20 popular streaming platforms:
|Platform Name||Optimal Video Bitrate||Optimal Audio Bitrate|
|Facebook Live||4 Mbps||128 Kbps|
|Dacast||Up to 4.5 Mbps||128 Kbps|
|Wirecast||Up to 6 Mbps||128 Kbps|
|IBM Cloud Video||Up to 8 Mbps||128 Kbps|
|Wistia||Up to 10 Mbps||128 Kbps|
|Vimeo Livestream||Up to 5 Mbps||128 Kbps|
|Kaltura||2 Mbps||128 Kbps|
|Brightcove||10 Mbps||128 Kbps|
|JW Player||Up to 9 Mbps||128 Kbps|
|Flowplayer||Up to 10 Mbps||128 Kbps|
|Vidyard||Up to 12 Mbps||128 Kbps|
|Wowza||Up to 12 Mbps||128 Kbps|
|Youtube||1.5 to 4 Mbps||128 Kbps|
|Twitch||2.5 to 4 Mbps||128 Kbps|
|Dailymotion||Up to 4 Mbps||192 Kbps|
|3.5 Mbps||128 Kbps|
|vMix||Up to 25 Mbps||128 Kbps|
|Periscope||2.5 Mbps||128 Kbps|
|Muvi||Up to 6 Mbps||128 Kbps|
The bitrate you select for your video content makes all the difference in how quickly it is uploaded and downloaded from the internet, and also plays directly into the overall quality of the video. The higher-quality your picture, the higher your video’s bitrate needs to be to transmit your video data with as little interruption to your viewer as possible.
With Dacast, you get multi-bitrate streaming capability, allowing you to transcode your videos so they stream on a variety of devices with just a few settings. And, with adaptive bitrate streaming, your viewers get the video file with the optimal bitrate for their device automatically for seamless streaming.
Are you ready to see what the Dacast platform can do for your VOD and live streaming content? Try it free for 30 days. You get access to all our great features without paying high startup fees, signing a contract, or giving away your credit card number.
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