Home » API Reference » Encoding Settings » VP6 » Constant Bitrate


:Boolean permalink

API Versions: V1, V2

Parent: outputs

Default: false

Valid Values: true or false

Compatible Job Types: All

Example: true


Constant bitrate (CBR) encoding is used by some streaming servers and decoders. CBR encoding looks significantly worse than variable bitrate (VBR) encoding at the same bitrate, so only use this setting if you absolutely must. This setting requires that you set a video_bitrate; you cannot use quality to autoselect a bitrate when using the constant_bitrate setting.

Do not use constant_bitrate for HTTP-based delivery, or for downloaded video.

Different video_codecs behave differently with the constant_bitrate setting.

  "input": "s3://zencodertesting/test.mov",
  "outputs": [
      "constant_bitrate": true
  <outputs type="array">
      <constant_bitrate type="boolean">true</constant_bitrate>