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When using vbr2, the main goal is to increase the quality of video and reduce its file size. This is achieved by altering the bit rate during encoding. This type of encoding is also known as variable bitrate (VBR).
While CBR uses a fixed, constant data rate to encode the entire stream, VBR assigns different rates to the various bits in the stream depending on complexity. This allows for greater adherence to the target and maximum bitrates than CBR, while still providing an excellent overall quality of video.
If you are streaming live or on demand and need to adhere to certain minimum and maximum bandwidth constraints, you should use constrained VBR (CVBR). This encoding type is best suited for video-on-demand (VOD) services. It helps to minimize the transient quality issues that can occur with CBR. It also helps to avoid the buffering that can be experienced with CBR streams when the peak bit rate is very high.
Another option is unconstrained VBR, which is typically used to encode HD content. This encoding type uses a quality level of your choosing as a guiding light, and seeks the highest quality across all data segments within this range. Unconstrained VBR can be very effective at reducing the total size of an HD video, but it doesn’t provide the same level of consistency and performance as quality VBR.