---
title: "Bitrate"
canonical: "https://support.clintonelectronics.com/space/KB/2364735492/Bitrate"
format: markdown
---
Bitrate refers to the rate at which digital data is transmitted, measured in bits per second (bps). In the context of video compression, bitrate represents the amount of data required to encode a certain amount of video content. It's a key factor in balancing the trade-off between video quality and file size. A higher bitrate generally results in better video quality but requires more storage space and bandwidth for transmission.

> Macro (toc)

# Bitrate Options

## Constant Bit Rate (CBR)

**CBR**, or Constant Bit Rate, is a video compression method where the bitrate remains fixed throughout the duration of the video. In CBR, each frame is compressed to the same target bitrate, regardless of the content's complexity. While CBR ensures a consistent stream of data, it can result in inefficiencies because it allocates the same amount of data to simple and complex scenes alike. This can lead to either wasted space (in simple scenes) or compromised quality (in complex scenes).

Key characteristics of CBR include:

- **Predictable Data Flow:** CBR provides a steady and predictable flow of data, which can be useful for applications with strict bandwidth requirements.
- **Consistent File Sizes:** Videos compressed using CBR tend to have consistent file sizes, making it easier to estimate storage needs.
- **Limited Adaptability:** CBR cannot adjust to varying complexities within the video, potentially resulting in quality variations between scenes.

## Variable Bit Rate (VBR)

**VBR**, or Variable Bit Rate, is a more adaptive video compression approach that dynamically adjusts the bitrate based on the complexity of the content being compressed. In VBR, scenes with higher complexity receive a higher bitrate allocation, while simpler scenes are allocated fewer bits. This results in more efficient compression and improved video quality compared to CBR.

Key characteristics of VBR include:

- **Optimized Quality:** VBR allocates more bits to complex scenes, maintaining better quality during challenging sequences and optimizing file sizes during simple scenes.
- **Flexible Data Allocation:** VBR adapts to content complexity, making it ideal for videos with varying scenes and motion levels.
- **Variable File Sizes:** Videos compressed using VBR can have varying file sizes, making storage planning more dynamic.
- **Improved Efficiency:** VBR is generally more efficient than CBR in terms of video quality and compression ratios.

## Other Types of Bitrate Settings

Some cameras feature “enhanced” VBR options called eVBR, VBR+, or other various acronyms. These options offer a higher compression rate than standard VBR. The effectiveness will be maximized if the video is less dynamic. Depending on the decoding software or hardware used, the VBR+/eVBR video stream data may not display correctly. If necessary, consult with the decoding software or hardware manufacturer

# Choosing Between CBR and VBR:

The choice between CBR and VBR depends on your specific use case:

- **CBR:** Choose CBR when you have strict bandwidth requirements or need a consistent data flow. This is suitable for live streaming or scenarios where network stability is crucial.
- **VBR:** Opt for VBR when video quality is a priority and your content contains varying complexities. It's ideal for applications where optimal video quality and efficient compression are desired.

# Bitrate Reference Chart

Use the chart below as a reference for bit rate values with some common resolutions and frame rates. These are suggested starting bit rate values and should be adjusted accordingly to meet the requirements of the install network and VMS/NVR.

**H.264 Bit-rate Guide:**

| **Resolution** | **30 fps** | **20 fps** | **15 fps** | **10 fps** | **5 fps** |
| --- | --- | --- | --- | --- | --- |
| 1920 x 1080 | 4096 Kbps | 2800 Kbps | 2048 Kbps | 1536 Kbps | 768 Kbps |
| 1280 x 720 | 2048 Kbps | 1536 Kbps | 1024 Kbps | 768 Kbps | 384 Kbps |
| 704 x 480 | 1024 Kbps | 640 Kbps | 512 Kbps | 384 Kbps | 192 Kbps |

> ℹ️ **Note**: Settings the camera's bit rate too high creates unnecessary network bandwidth, while setting it too low degrades image quality significantly.