Introduction
The choice of using Constant bitrate (CBR) compared to Variable bitrate (VBR) depends on the available bandwidth between an encoder to the target media server, and the same between the media distribution network and end users. Where bandwidth is limited or network conditions are unstable, Constant Bitrate (CBR) is the way to go.
CBR ensures a stable streaming experience, preventing buffering and interruptions even in challenging network environments. If your audience comprises viewers with varying internet speeds, CBR can deliver consistent video quality for all.
VBR shines in robust network conditions and high-speed connections. With its adaptability, VBR optimizes data usage, providing superior video quality when the network permits. Viewers with high-speed internet connections can enjoy higher resolution and clearer visuals, thanks to VBR's dynamic bitrate adjustments.
CBR vs. VBR
Choosing between CBR and VBR for video streaming depends on factors such as content complexity, audience network conditions, and desired video quality. CBR provides a consistent quality but can lead to buffering or stuttering if the viewer's internet connection fluctuates. VBR adjusts quality based on content complexity, providing smoother playback but potentially sacrificing overall quality.
As such, when it comes to VBR vs CBR video - CBR is the best option for live video streaming, whereas VBR is the best option for on-demand video upload.
Transcoding Consideration
Some Videolinq subscription plans support the automatic transcoding of incoming live video. This method provides adaptive bitrate to end viewers, similar to VBR. For example, when you send a 4 MBps live stream to Videolinq, you can enable transcoding in the channel Player tab.
Enabling Adaptive Bitrate (ABR) will improve the performance of live streaming to audiences with various bandwidth availability.
CBR/VBR Dependencies
We recommend using CBR in your RTMP encoder and enabling ABR. This workflow maximizes transmission from the encoder to Videolinq and ABR from Videolinq to the viewer.
Using VBR on the encoder and enabling ABR on the Videolinq channel will cause the signal to move constantly between low to high bitrate, and break the stream. If you use VBR on the encoder do not use ABR with Videolinq.
To use Videolinq Studio you must enable ABR, meaning your source stream from the encoder to Videolinq must use CBR settings.
If you have questions about this article contact our support team.