When it comes to selecting VBR vs. CBR, It is almost always recommended that you use VBR encoding for your media files as it provides higher quality files. We would suggest that you do not use CBR unless you have a specific need for playback on a device that only supports CBR. Our default VRB mode will produce higher quality at competitive bitrates. It means people who may otherwise choose not to watch due to fear of running out of mobile data or being on WiFi can do so guilt-free!
The abbreviation VBR stands for variable bitrate. Well, the term itself suggests its functionality. VBR is an encoding method that makes the bitrate of the audio files increase or decrease according to the requirement. There is a target range when it comes to bitrate. For example, variable bitrate encoding can range from 65 kbps to kbps. VBR file formats have the unique feature of sound quality and file size ratio. For example, if the original sound quality of the file is relatively low, VBR will alter the size of the file.
Thus, low-quality files will be lightweight, and the exact opposite will be true for high-quality files. Based on the VBR mechanism, the file bitrate will be noticeably lowered for inaudible segments.
What about the more complex parts of the track where there is a mix of frequencies? Well, the bitrate of those segments will automatically increase to a maximum of kbps. Therefore, the sound quality will be maintained in the areas where it is necessary. So overall, this is a great way to achieve a reasonably small file capacity while maintaining decent quality.
VBR allows the bitrate of an audio file to increase or decrease within a target range dynamically. Smaller file size can usually be achieved by encoding the audio with VBR rather than CBR due to how the bit rate is altered depending on the nature of the sound. The bit rate is reduced for silence or quieter parts of a song. For more complex areas of the music containing a mix of frequencies, the bit rate increases up to Kbps to maintain sound quality. If the bitrate goes higher than the supported bitrate value of the respective network, the streaming would be interrupted.
So, it makes more sense to have a CBR file when it comes to a task like online streaming. Well, the term itself suggests its functionality. In other words, the constant bit rate and variable bit rate are concepts with exactly opposite meanings. VBR is an encoding method that makes the bitrate of the audio files either increase or decrease depending on the requirement.
There is a target range when it comes to bitrate. For instance, it can range from 65 kbps to kbps. VBR file formats have the special characteristic of sound quality to file size ratio.
Because of this aspect, you can achieve a smaller file size to match the quality of the video. For instance, if the original sound quality of the file is pretty low, VBR will alter the file size. Thereby, low-quality files will be light in weight, and the exact opposite will happen with high-quality files. As per the mechanism of VBR, the bitrate of the file will be reduced remarkably for inaudible segments.
What about more complex parts of the track where there is a mix of frequencies? Well, the bitrate of those segments will be automatically increased to a maximum of kbps.
So, the sound quality will be maintained in the areas where it is absolutely necessary. On the upper right, you see the average bitrate for both files, which was kbps for the CBR file and kbps for the VBR file.
So, the Adobe Media Encoder hit the target bitrate for both files. This is typical for desktop encoders like the Adobe Media Encoder as opposed to live streaming encoders , where hitting these targets precisely is seldom relevant. In contrast, most streaming encoders offer closer adherence to the target and maximum bitrates. Conversely, you also see that while the CBR encoder allocated most of the bits evenly over the entire file, the VBR stream allocated much more of the bits to the hard-to-encode region at the end of the file.
With these two patterns in mind, ask yourself two questions. Then consider, which file would you rather stream to a viewer watching on a 3G connection? Though not evident from our experiments, CBR encodes infrequently produce transient quality drops when the encoder sacrifices short-term quality to meet the target bitrates. For this reason, most producers avoid CBR whenever possible.
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