Obs What Bitrate to Use With 10mb Upload
We get a lot of questions about how to discover the optimal resolution to bitrate ratio. The truth is, at that place really is no correct or wrong reply. Depending on your encoder, video content, audience, and streaming destination, your resolution and bitrate will likely be unlike. That being said, you tin optimize your resolution and bitrate to ensure consistent video quality and make your video viewable by the majority of your audience.
What Are Resolutions? What Are Bitrates?
To best determine the optimal ratio for your stream, let's first define what resolutions and bitrates are and how they bear upon video quality.
Resolution is the number of pixels spread beyond a brandish and is usually written in the form of horizontal pixels x vertical pixels, such as 1920 x 1080. The resolution of your display affects the highest resolution of stream you lot can watch. Resolution is sometimes referred to in a shorthand format using just the vertical pixels, such as 720p instead of 1280x720.
For example, if you lot have a 720p monitor and are watching a 720p stream, that's perfect. Your monitor can display every pixel of the video. If the stream was broadcast in 1080p, however, your monitor volition scale the image into 720p. Information technology won't inhibit the video quality, merely since the monitor can only run into 720 pixels, anything beyond that is wasted bandwidth.
Bitrate is the amount of information encoded for a unit of fourth dimension, and for streaming is unremarkably referenced in megabits per second (Mbps) for video, and in kilobits per second (kbps) for audio. From a streaming perspective, a higher video bitrate means a higher quality video that requires more bandwidth. And so why doesn't everyone but upload at the highest bitrate possible? Well, not every viewer tin download at the highest bitrate possible.
If you have a download speed of 5 Mbps and you are watching a stream at half dozen Mbps, the viewing feel will be inclement, and you'll probably get stuck in buffering limbo considering your connection can't keep upwardly with the amount of information being sent on the stream.
Key Considerations for Choosing a Resolution and Bitrate
- How much bandwidth exercise I have to broadcast?
You must evaluate your network connexion to determine whether it is strong plenty to support your stream at your desired resolution. Streaming at 1080p60 requires more bandwidth than streaming at 1080p30 or 720p60. Nosotros recommend only dedicating 50% of your upload speed to your stream in case your connection suddenly becomes unstable or you encounter unexpected interference from sending across the internet to the streaming platform.
If your available bandwidth isn't robust enough to support streaming at your desired resolution and bitrate, yous can apply network bonding to combine bandwidth from multiple internet sources into a single, stronger connection. By connecting your uniform encoder with Teradek'southward cloud stream management platforms, Cadre or Sharelink, y'all can bond network connections from ethernet, wifi, cellular modems, and even mobile phones to overcome bandwidth restrictions on the encoder side.
Finally, if you have limited bandwidth at your circulate site but your encoder is capable of streaming with a more than efficient video codec like HEVC / H.265 instead of only H.264, you can send out a lower bitrate HEVC stream from your encoder and have it transcoded to H.264 in the cloud for final delivery to streaming destinations and viewers.
- How is my audience watching? How much bandwidth do they accept?
Consider where and how your audition will be watching your video and what their bandwidth limitations may exist. Are they on computers or mobile phones? Using Ethernet or LTE? If the majority of your audition doesn't have plenty bandwidth to scout your video in 1080p, then you shouldn't have to push your bandwidth over the edge just to upload a 1080p video.
Cloud transcoding tin help those watching with slower connections or on mobile devices with data limits because it enables the unmarried stream sent out from your encoder to be converted into several lower resolution and lower bitrate streams that the viewers can cull instead of each viewer receiving the aforementioned higher resolution / college bitrate stream. Platforms capable of cloud transcoding include Facebook Live, YouTube Live, Vimeo, and IBM Cloud Video.
- What blazon of content am I sending? How much practise I need to send?
More dynamic content requires college bitrates to accept skillful quality, so you lot will need a higher bitrate to stream sporting events or video game competitions as opposed to speakers giving presentations at a conference or commencement ceremonies.
The encoded frame rate also affects the required bitrate. When streaming sports you could encode a lx frames per second (fps) stream at 1080p60 or 720p60; for lower move events like lectures or conferences, encoding and sending 60 fps may not provide a visible benefit, merely requires significantly more bandwidth than streaming at the more mutual xxx fps. Non all online streaming platforms can have a lx fps stream, and non all viewers can handle receiving sixty fps, so be sure to take that into consideration.
Finally, at that place are two unlike methods of encoding the video: constant and variable. A constant bitrate encodes at approximately the same rate throughout the stream. While this tin aid maintain consistent quality, a constant bitrate isn't always platonic for streaming over the internet since the same amount of data is being sent even when the content isn't very complex, incurring college costs from mobile data plans.
Teradek encoders use a variable bitrate encoding to more efficiently encode. If there's not a lot of motility - like a speaker at a podium - your encoder volition utilize a lower bitrate to save on outbound data but increase the encoding quality as needed, such equally when y'all pan the camera or zoom for a wider shot.
- To which CDN / OVP am I streaming?
If y'all're streaming to a unmarried destination - direct to Facebook Live or YouTube Live, for example - then your encoder'southward settings need to lucifer that destination'southward requirements for bitrate and resolution on the incoming stream.
Some platforms like YouTube Alive or IBM Cloud Video need video bitrates to be inside a certain range for the resolution, and then if y'all don't have enough bandwidth at your site for a 1080 stream, you need to scale down the streaming resolution and bitrate to fall inside their requirements.
If you're using Cadre or Sharelink to stream to multiple destinations at the same fourth dimension, then y'all demand to choose encoding settings that are uniform with every destination, since the encoder will simply send out a single stream into Cadre or Sharelink, and that stream is then replicated to each destination.
Go on in mind that every streaming platform comes with different presets which may limit the video bitrate and resolution combinations they will take. Here are some pop streaming destinations and their settings:
- IBM Cloud Video
- Facebook Live
- YouTube Live
- Twitch
- Vimeo Live
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Source: https://teradek.com/blogs/articles/what-is-the-optimal-bitrate-for-your-resolution
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