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CBR vs VBR: Which Bitrate Is Better for Video Encoding/Transcoding

Have you ever tried to convert a video format to another, or rip a music CD to MP3, AAC or WMA? After the conversion, we can easily find the format change, and the video or audio source can be played on the target devices. However, there is a lot that goes on behind the encoding to deliver high-quality outputs. CBR or VBR could matter most. So, what's the difference between CBR and VBR? Which bit rate is better for video encoding or transcoding? Scroll down...

Part 1. What Is CBR Encoding and VBR Encoding

Before everything, you should know that bitrate impact the quality of your video and audio. It measures the amount of data that is transferred over a period of time. And there are two types of encoding for bitrate: CBR and VBR.

What's CBR Encoding?

Constant bitrate, which is commonly abbreviated to "CBR", refers to transmitting data at the same bitrate. For example, 3000kbps, which means the video will be encoded in 3000kbps from beginning to end. If your video is encoded in constant bitrate, it means that it's not responsive to the size or complexity of the files.

CBR encoding is the most effective solution for video streaming. As there is usually a limited bandwidth on streaming platforms, CBR precisely can take the full advantage of the capacity to reach the best quality. But CBR is not suitable for local media storage, since it's not competent enough to encode complex video scenes. This could lead to quality degradation on complex scenes and waste of bitrate on simple scenes.

What's CBR encoding
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What's VBR Encoding?

VBR allows the bitrate of an audio file to dynamically increase or decrease within a target range. If your video is encoded in variable bitrate, segments of data will be packaged by their complexity so that the transmission is optimized. That is to say, in VBR encoding, the bitrate will dynamiclly go higher or lower based on different scenes, namely increased for complex scenes and decreased for simple scenes.

Thus, VBR is more suitable to storage multimedia files than CBR. But it may take more time to encode. And you may run into incompatibility issue on some media players or devices since they are not able to decode videos in VBR.

What's VBR encoding
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Part 2. CBR vs VBR: What's The Difference?

You may have heard about a lot about conclusions about CBR and VBR comparison. For example:

  1. CBR delivers overall lower quality than VBR.
  2. Constrained VBR delivered the highest quality.
  3. CBR-encoded video can exhibit transient quality drops, sometimes dramatic.
  4. Using 110% constrained VBR seems to avoid these quality issues without introducing significant data rate variability.
  5. In most instances, encoding with 200% constrained VBR delivers the maximum quality.
  6. ...

If you're still confused on what's difference between CBR and VBR, here we've made a conclusion for the pros and cons of CBR and VBR encoding.




  • Fixed quality and more control over audio quality
  • Quicker encoding speed
  • Wider compatibility for media players and devices
  • More suitable for multimedia streaming
  • Smaller file size
  • More efficient use of storage space
  • Flexible reduction in bitrate


  • Take up more storage space
  • Lower quality for complex scenes processing
  • Inflexible
  • Less widely supported
  • Take longer to encode


Part 3. How to Convert VBR to CBR or Vice Versa

As you can see, CBR and VBR, each has its advantages. You can make your own choice based on actual need. After that, you may need convert VBR to CBR or inversely convert CBR to VBR. Free Video Converter is handy tool that can help you change video bitrate in VBR or CBR.

Moreover, it's also available to make more settings like change 60fps to 30fps, convert VFR to CFR, downscale 4K to 1080p, convert video format/codec, change video aspect ratio and so on.

Better yet, it's quite simple to transcode video in VBR or CBR bit rate. Here are the simple guide for switching CBR or VBR encoding with WinX Video Converter.

Step 1: Load your video source of VBR or CBR encoding.

Free download this free video converter and open it up. Then click "+ Video" or drag-n'-drop to import your target video to the program. You're able to load several video files at one time for bulk conversion.

Load video into WinX
Load video into WinX

Step 2: Choose an output format.

Then choose an output format from the automatically popped up window. For example, go to "General Profiles" and choose "MP4 (h264+aac)" for better compatibility. Of course, if you don't plan to re-encode your video, keep the same format, codec and resolution as your input.

Select output format
Select output format

Step 3: Change VBR to CBR or vice versa.

Click on the gear shaped settings button, then you'll see a window to adjust video parameters. Find Bitrate (Quality) option and click CBR or VBR to shuffle as you need. This helps you change VBR to CBR or vice versa. Also, if you select CBR, you can set the bitrate manually.

Convert VBR to CBR
Convert VBR to CBR

Step 3: Start transcoding VBR or CBR.

Tap on the blue "RUN" button at the right corner of the main interface to start switching CBR or VBR.


author - Kistent Waung

Kistent Waung twitter icon

Graduated from Nanyang Technological University, Singapore, she employs herself in IT related content creation (since 2013) and happens to perfectly combine her major (computer & science) and her gusto (writing). She's seasoned at offering video audio conversion workarounds and always passionate about new trends, from hot HEVC, 4K to the new AV1 codec.

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