When you're using our powerful API to control the VBR settings of your encode, there's a few additional options that you can supply to control the settings. There are a few things to consider:

—> – Bufsize: (Rate control buffer size) You always MUST specify it when setting minrate and/or maxrate. A buffer with that size will be used to calculate current bitrate. 
 
bufsize [optional] – Rate control buffer size (bits).
     Allowed values: N or Nk – where N is any non-zero integer.
     Default: None
 
–> – Minrate and Maxrate : These items limit the bitrate of the encoded video must not drop below or exceed.  
maxrate [optional] – Maximum allowed video bitrate.
     Allowed values: N or Nk – where N is any non-zero integer.
     Default: None
 
minrate [optional] – Minimum allowed video bitrate.
     Allowed values: N or Nk – where N is any non-zero integer.
     Default: None
 
–> – Rc_init_occupancy: The initial rate control buffer occupancy (number of bits which should be loaded into the RC buffer before decoding starts). 
 
rc_init_occupancy [optional] – Initial rate control buffer occupancy (bits).
     Allowed values:  N or Nk – where N is any non-zero integer.
     Default: None

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