The full form of VBR is Variable Bit Rate. It’s used on Computing ,Compression & Encoding in Worldwide

Variable bitrate (VBR) is a term used in telecommunications and computing that relates to the bitrate used in sound or video encoding.

VBR or Variable Bit Rate is a term used in computing and telecommunications that relates to the bitrate used in video or sound encoding. VBR files differ the amount of output data per time segment contrasted with constant bitrate (CBR). While a smaller amount space is allocated to less complex segments, VBR allows a higher bitrate (Hence needs more storage space) to be allocated to the more complex segments of media files. The average of these rates can be calculated to produce an average bitrate for the file.

VBR encoding regulates the data rate down and to the upper limit you set, depending on the data required by the compressor. This means that during a VBR encoding process the bitrate of the media file will dynamically decrease or increase based on the media files bit rate requirements. VBR produces the most favorable results even though it takes longer to encode as the quality of the media file is superior. Most commonly, VBR is used for http delivery of video content.

Bitrate is the number of bits that are processed when sending files, and the transfer rate of the data that makes up a media signal. It is normally measured in seconds. For video, this is typically measured in megabits per second (or Mbps, or Mb/s); with audio, it is usually is measured in kilobits per second (or kb/s or kbps).

The term bitrate, also written as bit rate, gets tossed around a lot in mobile development, so it might be good to go over some common terminology:

• VBR stands for variable bitrate, a control technique which allows the bit rate to vary, but maintains the quality.
• CBR stands for constant bitrate, a control technique which keeps the bitrate constant, but allows video quality to vary.
• MBR stands for maximum bitrate, a control technique which allows the bit rate to vary, but only up to a maximum value.
• ABR stands for adaptive bitrate, a video segment management technique which delivers different quality levels of video to the client based on network capability at a given time. It is different than the three bitrates terms above that relate to controlling the bitrate. Other Best Practices cover information on ABR streaming.

Variable bitrate (VBR) is the recommended bitrate used in sound or video encoding. Unlike constant bitrate (CBR), VBR files vary based on the amount of output data in a given media segment. CBR encoding control maintains a set bitrate over the entire video clip.

With VBR, the average transfer rates may be calculated to determine the average bitrate for a file.